/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: #e0e0e0;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 25%, #16213e 50%, #0f3460 75%, #1a1a2e 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Animated background gradient */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Futuristic background particles */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 40% 80%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Modern Navigation Bar */
.navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(71, 85, 105, 0.2);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    gap: 2rem;
    position: relative;
}

/* Brand Section */
.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.brand-icon {
    font-size: 1.75rem;
    filter: drop-shadow(0 0 8px rgba(0, 245, 255, 0.6));
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #00f5ff 0%, #0ea5e9 50%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    letter-spacing: -0.025em;
}

@keyframes glow {
    from { text-shadow: 0 0 20px rgba(0, 245, 255, 0.5); }
    to { text-shadow: 0 0 30px rgba(0, 245, 255, 0.8); }
}



/* Navigation Links */
.nav-links {
    display: flex;
    list-style: none;
    gap: 0;
    margin: 0;
    padding: 0;
    flex: 1;
    justify-content: center;
}

.nav-item {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    position: relative;
    letter-spacing: 0.025em;
}

.nav-item:hover {
    color: #f1f5f9;
    background: rgba(71, 85, 105, 0.2);
}

.nav-item.active {
    color: #0ea5e9;
    background: rgba(14, 165, 233, 0.1);
    box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.2);
}

/* Action Buttons */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.btn-login {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1.5px solid rgba(71, 85, 105, 0.4);
    color: #cbd5e1;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-login:hover {
    border-color: rgba(71, 85, 105, 0.6);
    background: rgba(71, 85, 105, 0.1);
    color: #f1f5f9;
}

.btn-signup {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    border: none;
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.25);
}

.btn-signup:hover {
    background: linear-gradient(135deg, #0284c7, #0369a1);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.4);
    transform: translateY(-1px);
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #f1f5f9;
    font-size: 0.875rem;
    font-weight: 500;
}

.user-info i {
    font-size: 1.25rem;
    color: #0ea5e9;
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1.5px solid rgba(248, 113, 113, 0.3);
    color: #f87171;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.5);
    color: #fca5a5;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.hamburger-line {
    width: 20px;
    height: 2px;
    background: #cbd5e1;
    transition: all 0.3s ease;
    border-radius: 1px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(71, 85, 105, 0.2);
    padding: 1rem 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 999;
    transform: translateY(-10px);
    opacity: 0;
    transition: all 0.3s ease;
}

.mobile-menu.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0 2rem;
}

.mobile-nav-item {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(71, 85, 105, 0.1);
    transition: all 0.2s ease;
}

.mobile-nav-item:hover {
    color: #f1f5f9;
    padding-left: 1rem;
}

.mobile-nav-item.active {
    color: #0ea5e9;
    border-left: 3px solid #0ea5e9;
    padding-left: 1rem;
}

.mobile-auth {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid rgba(71, 85, 105, 0.2);
    margin-top: 1rem;
}

.mobile-btn-login,
.mobile-btn-signup {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.mobile-btn-login {
    background: transparent;
    border: 1.5px solid rgba(71, 85, 105, 0.4);
    color: #cbd5e1;
}

.mobile-btn-login:hover {
    background: rgba(71, 85, 105, 0.1);
    color: #f1f5f9;
}

.mobile-btn-signup {
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    color: #ffffff;
}

.mobile-btn-signup:hover {
    background: linear-gradient(135deg, #0284c7, #0369a1);
}

.mobile-user-menu {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #f1f5f9;
    font-weight: 500;
    padding: 0.75rem 0;
}

.mobile-user-info i {
    font-size: 1.5rem;
    color: #0ea5e9;
}

.mobile-btn-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    border: 1.5px solid rgba(248, 113, 113, 0.3);
    color: #f87171;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-btn-logout:hover {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.5);
}

/* Click ripple effect */
.click-ripple {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 245, 255, 0.6) 0%, rgba(0, 245, 255, 0.3) 30%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    animation: rippleAnimation 0.6s ease-out;
    pointer-events: none;
    z-index: 5;
}

@keyframes rippleAnimation {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(3);
        opacity: 0;
    }
}

.nav-link.active {
    color: #00f5ff;
    background: rgba(0, 245, 255, 0.2);
    border-color: rgba(0, 245, 255, 0.5);
    box-shadow: 0 0 25px rgba(0, 245, 255, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    cursor: pointer;
    padding: 0;
    background: transparent;
    border: none;
    position: relative;
    z-index: 10;
    margin-left: 1rem;
}

.hamburger span {
    width: 100%;
    height: 2px;
    background: #00f5ff;
    border-radius: 2px;
    transition: all 0.3s ease;
    box-shadow: 0 0 5px rgba(0, 245, 255, 0.5);
    transform-origin: left;
}

.hamburger:hover span {
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.8);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg);
    width: 32px;
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg);
    width: 32px;
}

/* Page Management */
.page {
    display: none;
    padding: 2rem 0;
}

.page.active {
    display: block;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 4rem 0;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    margin: 2rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.1) 0%, rgba(0, 212, 255, 0.05) 50%, rgba(0, 153, 255, 0.1) 100%);
    pointer-events: none;
    z-index: -1;
}

.hero-content {
    padding: 2rem;
    z-index: 1;
}

.hero h2 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, #00f5ff 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    line-height: 1.2;
    text-shadow: 0 0 40px rgba(0, 245, 255, 0.3);
}

.hero p {
    font-size: 1.2rem;
    color: #b0b0b0;
    margin-bottom: 2rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.hero-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(45, 90, 39, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
}

.stat i {
    color: #2d5a27;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0.7;
}

.hero-image img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 245, 255, 0.2);
    transition: all 0.3s ease;
}

.hero-image img:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 245, 255, 0.3);
}

/* Buttons */
.cta-button, .calculate-btn, .action-btn {
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 50%, #00d4ff 100%);
    color: #000;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 700;
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.3);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cta-button::before, .calculate-btn::before, .action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.cta-button:hover::before, .calculate-btn:hover::before, .action-btn:hover::before {
    left: 100%;
}

.cta-button:hover, .calculate-btn:hover, .action-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 40px rgba(0, 245, 255, 0.6);
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 50%, #0099ff 100%);
}

/* Features Grid */
.features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.05) 0%, rgba(0, 212, 255, 0.02) 50%, rgba(0, 153, 255, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 50px rgba(0, 245, 255, 0.2);
    border-color: rgba(0, 245, 255, 0.3);
}

.feature-card i {
    font-size: 3rem;
    color: #00f5ff;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(0, 245, 255, 0.5);
    transition: all 0.3s ease;
}

.feature-card:hover i {
    color: #00d4ff;
    text-shadow: 0 0 30px rgba(0, 245, 255, 0.8);
    transform: scale(1.1);
}

.feature-card h3 {
    color: #ffffff;
    margin-bottom: 1rem;
    font-weight: 600;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.feature-card p {
    color: #b0b0b0;
    line-height: 1.6;
}

/* Calculator Form */
.calculator-form {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
}

.form-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border: 1px solid rgba(0, 245, 255, 0.2);
    border-radius: 15px;
    background: rgba(0, 245, 255, 0.02);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.form-section:hover {
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.1);
}

.form-section h3 {
    color: #00f5ff;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #e0e0e0;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.1);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: #e0e0e0;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #00f5ff;
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder {
    color: #888;
}

.form-group select option {
    background: #1a1a2e;
    color: #e0e0e0;
}

/* Results Section */
.results {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    margin-top: 2rem;
}

.results.hidden {
    display: none;
}

.results h3 {
    color: #ffffff;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    text-align: center;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-card {
    background: rgba(0, 245, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 245, 255, 0.2);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.result-card:hover {
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.result-card.primary {
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.2) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-color: rgba(0, 245, 255, 0.5);
    color: white;
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.3);
}

.result-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: #e0e0e0;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.1);
}

.result-card.primary h4 {
    color: #ffffff;
}

.result-card span {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.result-card.primary span {
    color: #ffffff;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
}

.breakdown {
    margin-bottom: 2rem;
}

.breakdown-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 4px solid #00f5ff;
    color: #e0e0e0;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Chat Interface */
.chat-container {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
    overflow: hidden;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.message {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.message.user {
    flex-direction: row-reverse;
}

.message-content {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.message-content:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.message.bot .message-content {
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.2) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-color: rgba(0, 245, 255, 0.3);
    color: white;
    box-shadow: 0 4px 20px rgba(0, 245, 255, 0.2);
}

.message.user .message-content {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    color: #e0e0e0;
}

.chat-input-container {
    display: flex;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

#chat-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    font-size: 1rem;
    margin-right: 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: #e0e0e0;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

#chat-input:focus {
    outline: none;
    border-color: #00f5ff;
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

#chat-input::placeholder {
    color: #888;
}

#send-btn {
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
    color: #000;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 700;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

#send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 100%);
}

.quick-questions {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    padding: 2rem;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
}

.question-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.question-buttons button {
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    color: #e0e0e0;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.question-buttons button:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
    color: #00f5ff;
}

/* Progress Page */
.progress-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.progress-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    height: fit-content;
}

.progress-card:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 12px 40px rgba(0, 245, 255, 0.1);
}

.progress-card h3 {
    color: #ffffff;
    margin-bottom: 1rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    font-size: 1.2rem;
}

/* Chart Canvas Styling */
#footprint-chart,
#streak-chart {
    max-height: 250px;
    width: 100%;
}

/* Streak Statistics */
.streak-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0, 245, 255, 0.2);
}

.streak-stat {
    text-align: center;
    padding: 0.75rem;
    background: rgba(0, 245, 255, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(0, 245, 255, 0.1);
    transition: all 0.3s ease;
}

.streak-stat:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.3);
    transform: translateY(-2px);
}

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: #b0b0b0;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

/* Monthly Summary */
.monthly-summary {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.summary-stat {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    border-left: 4px solid #00f5ff;
    transition: all 0.3s ease;
}

.summary-stat:hover {
    background: rgba(0, 245, 255, 0.05);
    transform: translateX(5px);
}

.summary-stat i {
    font-size: 1.2rem;
    color: #00f5ff;
    min-width: 20px;
}

.summary-stat span {
    color: #e0e0e0;
    font-weight: 500;
}

.achievements {
    display: grid;
    gap: 0.75rem;
}

.achievement {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 12px;
    background: rgba(0, 245, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 245, 255, 0.2);
    border-left: 4px solid #00f5ff;
    transition: all 0.3s ease;
}

.achievement:hover {
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.achievement.locked {
    opacity: 0.3;
    background: rgba(255, 255, 255, 0.02);
    border-left-color: #555;
    border-color: rgba(255, 255, 255, 0.1);
}

.achievement i {
    font-size: 1.5rem;
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.achievement.locked i {
    color: #555;
    text-shadow: none;
}

.achievement span {
    color: #e0e0e0;
    font-weight: 500;
}

.climate-info {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    padding: 2rem;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
}

.climate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.climate-item {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

/* Tips Page */
.tips-header {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    padding: 2rem;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
    margin-bottom: 2rem;
}

.streak-counter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
    margin-bottom: 1rem;
}

.streak-counter i {
    color: #ff6b35;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: #e0e0e0;
    border-radius: 5px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #00f5ff, #0099ff);
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
    transition: width 0.3s ease;
}

.actions-list {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    padding: 2rem;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
    margin-bottom: 2rem;
}

.action-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.action-item:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

.action-item.completed {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.action-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid #00f5ff;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: #00f5ff;
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.action-checkbox.checked {
    background: #00f5ff;
    color: #000;
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.5);
}

.tips-summary {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    padding: 2rem;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.tip-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 4px solid #00f5ff;
    color: #e0e0e0;
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.tip-card i {
    font-size: 2rem;
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
    margin-bottom: 1rem;
}

.tip-card h4 {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background: rgba(26, 26, 46, 0.8);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.05) 0%, rgba(0, 212, 255, 0.02) 50%, rgba(0, 153, 255, 0.05) 100%);
    pointer-events: none;
}

footer p {
    position: relative;
    z-index: 1;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.developer-credit {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.dev-credit-link {
    color: #00f5ff;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.dev-credit-link:hover {
    color: #00d4ff;
    text-shadow: 0 0 15px rgba(0, 245, 255, 0.8);
}

/* Utilities */
.subtitle {
    color: #b0b0b0;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    text-align: center;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.hidden {
    display: none !important;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: #b0b0b0;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* Mobile-First Responsive Design */

/* Base styles - Mobile First (320px+) */
.container {
    padding: 0 1rem;
}

    .nav-container {
    padding: 0.75rem 1rem;
    gap: 1rem;
}

.brand-text {
    font-size: 1.1rem;
}

.brand-icon {
    font-size: 1.25rem;
}

/* Hide desktop navigation on mobile */
    .nav-links {
        display: none;
    }

    .nav-actions {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

/* Hero Section - Mobile */
.hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
    padding: 2rem 1rem;
    margin: 1rem 0;
}

.hero h2 {
    font-size: 1.75rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.hero-stats {
    justify-content: center;
    gap: 1rem;
}

.stat {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.hero-image img {
    max-height: 200px;
}

/* Buttons - Mobile First */
.cta-button, .calculate-btn, .action-btn {
    padding: 1rem 1.5rem;
    font-size: 1rem;
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(0, 245, 255, 0.3);
    min-height: 48px; /* Minimum touch target */
}

/* Grid Layouts - Mobile First */
.feature-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.results-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
}

.breakdown-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.progress-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.tips-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.climate-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
}

.question-buttons {
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.developer-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
}

/* Forms - Mobile First */
    .form-section {
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group select {
    padding: 0.875rem;
    font-size: 1rem;
    min-height: 48px; /* Minimum touch target */
    /* Better mobile input handling */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    /* Prevent zoom on iOS */
    font-size: max(16px, 1rem);
}

/* Better select styling for mobile */
.form-group select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2300f5ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

/* Focus improvements for accessibility */
    .form-group input:focus,
    .form-group select:focus {
    outline: 2px solid #00f5ff;
    outline-offset: 2px;
}

/* Better button touch targets */
button, .btn, .cta-button, .calculate-btn, .action-btn {
    min-height: 48px;
    min-width: 48px;
    cursor: pointer;
        -webkit-tap-highlight-color: rgba(0, 245, 255, 0.3);
    touch-action: manipulation;
}

/* Improve checkbox and radio button touch targets */
input[type="checkbox"],
input[type="radio"] {
    min-width: 20px;
    min-height: 20px;
    margin: 0 0.5rem 0 0;
}

.calculator-form {
    padding: 1.5rem;
}

/* Cards - Mobile */
.feature-card {
    padding: 1.5rem;
}

.progress-card {
    padding: 1.25rem;
}

.result-card {
    padding: 1.25rem;
}

/* Actions */
.actions {
    flex-direction: column;
    gap: 0.75rem;
}

/* Chat - Mobile */
.chat-messages {
    height: 300px;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

#chat-input {
    padding: 0.875rem;
    font-size: 1rem;
}

#send-btn {
    padding: 0.875rem 1.25rem;
    min-width: 48px;
    min-height: 48px;
}

/* Developer Section - Mobile */
.developer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.5rem;
}

.developer-photo {
    width: 120px;
    height: 120px;
}

.developer-name {
    font-size: 1.6rem;
}

.developer-title {
    font-size: 1.1rem;
}

.developer-description {
    font-size: 1rem;
}

.developer-links {
    justify-content: center;
    gap: 0.75rem;
}

/* Touch interactions */
@media (hover: none) and (pointer: coarse) {
    .nav-item:active,
    .mobile-nav-item:active {
        background: rgba(0, 245, 255, 0.15);
        transform: scale(0.98);
    }

    .cta-button:active, 
    .calculate-btn:active, 
    .action-btn:active {
        transform: translateY(-1px) scale(0.98);
        box-shadow: 0 0 25px rgba(0, 245, 255, 0.4);
    }

    .feature-card:active,
    .progress-card:active,
    .result-card:active {
        transform: translateY(-5px) scale(0.98);
        box-shadow: 0 10px 40px rgba(0, 245, 255, 0.3);
    }

    .question-buttons button:active {
        transform: scale(0.95);
        background: rgba(0, 245, 255, 0.2);
    }
}

/* Small Mobile (up to 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .nav-container {
        padding: 0.5rem 0.75rem;
    }

    .hero {
        padding: 1.5rem 0.75rem;
        margin: 0.5rem 0;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.9rem;
    }

    .stat {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }

    .hero-image img {
        max-height: 180px;
    }

    .form-section {
        padding: 0.75rem;
    }

    .calculator-form {
        padding: 1rem;
    }

    .results {
        padding: 1rem;
    }

    .progress-card {
        padding: 1rem;
    }

    .feature-card {
        padding: 1.25rem;
    }

    .chat-messages {
        height: 250px;
    }

    .developer-photo {
        width: 100px;
        height: 100px;
    }

    .developer-name {
        font-size: 1.4rem;
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .tech-item {
        padding: 0.75rem;
    }

    .tech-item i {
        font-size: 1.8rem;
    }
}

/* Tablet Portrait (481px to 768px) */
@media (min-width: 481px) and (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2.5rem 1.5rem;
    }

    .hero h2 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .hero-image img {
        max-height: 280px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .climate-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .question-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .developer-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .chat-messages {
        height: 350px;
    }
}

/* Tablet Landscape & Small Desktop (769px to 1024px) */
@media (min-width: 769px) {
    /* Show desktop navigation */
    .nav-links {
        display: flex;
    }

    .nav-actions {
        display: flex;
    }

    .mobile-menu-toggle {
        display: none;
    }

    .mobile-menu {
        display: none !important;
    }

    .container {
        padding: 0 2rem;
    }

    .nav-container {
        padding: 1rem 2rem;
        gap: 2rem;
    }

    .brand-text {
        font-size: 1.5rem;
    }

    .brand-icon {
        font-size: 1.75rem;
    }

    .hero {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
        text-align: left;
        padding: 4rem 2rem;
        margin: 2rem 0;
    }

    .hero h2 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .hero-stats {
        justify-content: flex-start;
    }

    .hero-image img {
        max-height: 350px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .breakdown-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .progress-grid {
        grid-template-columns: 1fr 1fr;
    }

    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .climate-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .question-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .developer-content {
        grid-template-columns: auto 1fr;
        text-align: left;
        gap: 2rem;
    }

    .developer-photo {
        width: 160px;
        height: 160px;
    }

    .developer-name {
        font-size: 2rem;
    }

    .developer-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .actions {
        flex-direction: row;
    }

    .chat-messages {
        height: 400px;
    }

    .cta-button, .calculate-btn, .action-btn {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
}

/* Large Desktop (1025px and up) */
@media (min-width: 1025px) {
    .hero {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
        padding: 4rem 0;
    }

    .hero h2 {
        font-size: 3rem;
    }

    .hero-image img {
        max-height: 400px;
    }

    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .results-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .breakdown-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .tips-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .climate-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .question-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .developer-photo {
        width: 200px;
        height: 200px;
    }

    .developer-name {
        font-size: 2.2rem;
    }

    .developer-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Ultra-wide screens (1400px and up) */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
        padding: 0 3rem;
    }

    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 3rem;
    }

    .tips-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .climate-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* High DPI screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero-image img,
    .developer-photo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    .nav-container {
        padding: 0 0.75rem;
    }

    .nav-logo h1 {
        font-size: 1.1rem;
    }

    .hero-content {
        padding: 1rem;
    }

    .form-section {
        padding: 1rem;
    }

    .calculator-form {
        padding: 1rem;
    }

    .results {
        padding: 1rem;
    }

    .progress-card {
        padding: 1rem;
    }

    .tips-header {
        padding: 1rem;
    }

    .actions-list {
        padding: 1rem;
    }
    
    /* Ensure dark theme consistency on mobile */
    .tips-header, .actions-list, .tips-summary, .climate-info, .quick-questions {
        background: rgba(255, 255, 255, 0.03) !important;
        backdrop-filter: blur(20px) !important;
        border: 1px solid rgba(255, 255, 255, 0.1) !important;
        border-radius: 20px !important;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page.active {
    animation: fadeIn 0.5s ease-in-out;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #4a7c59;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2d5a27;
}

/* Additional Futuristic Elements */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0.8;
    animation: float 6s ease-in-out infinite;
}

.hero-image img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 245, 255, 0.3);
    transition: all 0.3s ease;
    filter: brightness(0.9) contrast(1.1);
}

.hero-image img:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 245, 255, 0.4);
    filter: brightness(1) contrast(1.2);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-stats .stat {
    background: rgba(0, 245, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 245, 255, 0.2);
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.hero-stats .stat:hover {
    background: rgba(0, 245, 255, 0.2);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
}

.hero-stats .stat i {
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

/* Enhanced Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 100%);
}

/* Page Transitions */
.page {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Glowing Text Effect */
.glow-text {
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
    animation: textGlow 2s ease-in-out infinite alternate;
}

@keyframes textGlow {
    from { text-shadow: 0 0 10px rgba(0, 245, 255, 0.5); }
    to { text-shadow: 0 0 20px rgba(0, 245, 255, 0.8); }
}

/* Celebration Animation */
@keyframes celebration {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1) translateY(-100px); opacity: 0; }
}

/* Additional Glass Cards */
.tips-header, .actions-list, .tips-summary, .climate-info, .quick-questions {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    border-radius: 20px !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
}

.tips-header h2, .actions-list h2, .tips-summary h3, .climate-info h3, .quick-questions h4 {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.streak-counter {
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.progress-fill {
    background: linear-gradient(90deg, #00f5ff, #0099ff);
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.action-item {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.action-item:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

.action-item.completed {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.action-checkbox {
    border-color: #00f5ff;
    color: #00f5ff;
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.action-checkbox.checked {
    background: #00f5ff;
    color: #000;
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.5);
}

/* Enhanced Question Buttons */
.question-buttons button {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.question-buttons button:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
    color: #00f5ff;
}

/* Enhanced Climate Data */
.climate-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.climate-item:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

.climate-item h4 {
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

/* Enhanced Breakdown Items */
.breakdown-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 4px solid #00f5ff;
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.breakdown-item:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

/* Enhanced Tip Cards */
.tip-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 4px solid #00f5ff;
    color: #e0e0e0;
    transition: all 0.3s ease;
}

.tip-card:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

.tip-card h4 {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.tip-card i {
    color: #00f5ff;
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

/* Developer Section Styles */
#developer h2 {
    color: #ffffff;
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.developer-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 3rem;
    margin: 2rem 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.developer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.05) 0%, rgba(0, 212, 255, 0.02) 50%, rgba(0, 153, 255, 0.05) 100%);
    pointer-events: none;
    z-index: -1;
}

.developer-card:hover {
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 12px 48px rgba(0, 245, 255, 0.1);
}

.developer-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.developer-avatar {
    text-align: center;
}

.developer-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #00f5ff;
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.8);
    animation: float 6s ease-in-out infinite;
    transition: all 0.3s ease;
    filter: brightness(1.1) contrast(1.1);
}

.developer-photo:hover {
    border-color: #00d4ff;
    box-shadow: 0 0 50px rgba(0, 245, 255, 1);
    transform: scale(1.05);
}

.developer-info {
    z-index: 1;
}

.developer-name {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, #00f5ff 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

.developer-title {
    font-size: 1.3rem;
    color: #00f5ff;
    font-weight: 600;
    margin-bottom: 1rem;
    text-shadow: 0 0 15px rgba(0, 245, 255, 0.5);
}

.developer-description {
    font-size: 1.1rem;
    color: #b0b0b0;
    line-height: 1.6;
    margin-bottom: 2rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.developer-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.dev-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    text-decoration: none;
    color: #e0e0e0;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.dev-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.dev-link:hover::before {
    left: 100%;
}

.dev-link.github:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.dev-link.linkedin:hover {
    background: rgba(0, 119, 181, 0.2);
    border-color: rgba(0, 119, 181, 0.5);
    box-shadow: 0 0 20px rgba(0, 119, 181, 0.3);
    color: #0077b5;
}

.dev-link i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.dev-link:hover i {
    transform: scale(1.2);
}

.developer-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(0, 245, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 245, 255, 0.2);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.stat-item:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.4);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.stat-item i {
    font-size: 1.5rem;
    color: #00f5ff;
    text-shadow: 0 0 15px rgba(0, 245, 255, 0.5);
}

.stat-item span {
    color: #e0e0e0;
    font-weight: 500;
}

.tech-stack {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    margin-top: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.tech-stack h3 {
    color: #ffffff;
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    transition: all 0.3s ease;
    text-align: center;
}

.tech-item:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: rgba(0, 245, 255, 0.3);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
    transform: translateY(-5px);
}

.tech-item i {
    font-size: 2.5rem;
    color: #00f5ff;
    text-shadow: 0 0 20px rgba(0, 245, 255, 0.5);
    transition: all 0.3s ease;
}

.tech-item:hover i {
    color: #00d4ff;
    text-shadow: 0 0 30px rgba(0, 245, 255, 0.8);
    transform: scale(1.1);
}

.tech-item span {
    color: #e0e0e0;
    font-weight: 500;
    font-size: 0.9rem;
}

/* Responsive Design for Developer Section */
@media (max-width: 768px) {
    .developer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .developer-photo {
        width: 150px;
        height: 150px;
    }
    
    .developer-name {
        font-size: 1.8rem;
    }
    
    .developer-links {
        justify-content: center;
    }
    
    .developer-stats {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .tech-item {
        padding: 1rem;
    }
    
    .tech-item i {
        font-size: 2rem;
    }
    
    /* Responsive streak stats */
    .streak-stats {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .streak-stat {
        padding: 0.5rem;
    }
    
    .stat-value {
        font-size: 1.2rem;
    }
} 

/* Authentication Styles */
.hidden {
    display: none !important;
}

.desktop-auth {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
    margin-left: auto;
}

.mobile-auth {
    display: none;
}

.desktop-auth .nav-link {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

#login-link {
    background-color: transparent;
    border: 1px solid #00f5ff;
    color: #00f5ff;
}

#login-link:hover {
    background-color: rgba(0, 245, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

#signup-link {
    color: #000;
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
    border: none;
}

#signup-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 100%);
}

#logout-link {
    color: #e53e3e;
    border: 1px solid #e53e3e;
    background: transparent;
}

#logout-link:hover {
    background-color: #e53e3e;
    color: white;
}

#user-name {
    color: #00f5ff;
    font-weight: 600;
}

/* Mobile auth buttons styling */
.mobile-auth .nav-link {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.2s;
}

#login-link-mobile {
    background-color: transparent;
    border: 1px solid #00f5ff;
    color: #00f5ff;
}

#login-link-mobile:hover {
    background-color: rgba(0, 245, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

#signup-link-mobile {
    color: #000;
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
    border: none;
}

#signup-link-mobile:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 100%);
}

#logout-link-mobile {
    color: #e53e3e;
    border: 1px solid #e53e3e;
    background: transparent;
}

#logout-link-mobile:hover {
    background-color: #e53e3e;
    color: white;
}

#user-name-mobile {
    color: #00f5ff;
    font-weight: 600;
}

/* Modal Styles */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalFadeIn 0.3s ease-out;
}

.auth-modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
}

.modal-container {
    position: relative;
    max-width: 420px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    margin: 1rem;
    padding: 2rem;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 245, 255, 0.15);
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    animation: modalSlideIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Modal responsive styles */
@media (max-width: 480px) {
    .modal-container {
        width: 95%;
        margin: 0.5rem;
        padding: 1.5rem;
        max-height: 95vh;
    }

    .modal-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .modal-container .form-group input {
        padding: 0.875rem 1rem 0.875rem 2.5rem;
        font-size: 0.9rem;
    }

    .modal-container .form-group .input-icon {
        left: 0.75rem;
        font-size: 0.9rem;
    }

    .modal-container .auth-btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.9rem;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .modal-container {
        max-width: 480px;
        padding: 2.5rem;
    }
}

.modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: rgba(71, 85, 105, 0.2);
    border: 1px solid rgba(71, 85, 105, 0.3);
    color: #94a3b8;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
    font-size: 0.875rem;
}

.modal-close:hover {
    background: rgba(71, 85, 105, 0.4);
    color: #f1f5f9;
    border-color: rgba(71, 85, 105, 0.5);
}

.modal-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.modal-container .auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

.modal-container .form-group {
    position: relative;
    margin-bottom: 1.25rem;
}

.modal-container .form-group.password-group {
    margin-bottom: 0.75rem;
}

.modal-container .form-group.password-group.has-requirements {
    margin-bottom: 0.5rem;
}

.modal-container .form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #cbd5e1;
    margin-bottom: 0.5rem;
    letter-spacing: 0.025em;
}

.modal-container .form-group input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border: 1.5px solid rgba(71, 85, 105, 0.3);
    border-radius: 12px;
    font-size: 0.95rem;
    color: #f1f5f9;
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
    font-family: inherit;
}

.modal-container .form-group .input-icon {
    position: absolute;
    left: 0.875rem;
    top: calc(50% + 0.625rem);
    transform: translateY(-50%);
    color: #64748b;
    font-size: 1rem;
    transition: all 0.3s ease;
    z-index: 2;
}

.modal-container .form-group input:focus {
    outline: none;
    border-color: #00f5ff;
    box-shadow: 0 0 0 3px rgba(0, 245, 255, 0.1), inset 0 1px 3px rgba(0, 0, 0, 0.1);
    background: rgba(30, 41, 59, 0.95);
}

.modal-container .form-group input:focus + .input-icon {
    color: #00f5ff;
}

.modal-container .form-group input::placeholder {
    color: #64748b;
    font-size: 0.9rem;
}

.modal-container .auth-btn {
    width: 100%;
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    color: #ffffff;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.25);
    text-transform: none;
    letter-spacing: 0;
    margin-top: 0.5rem;
    font-family: inherit;
}

.modal-container .auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.modal-container .auth-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
    transform: translateY(-1px);
}

.modal-container .message {
    text-align: center;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    display: none;
    font-size: 0.875rem;
    font-weight: 500;
    animation: slideInUp 0.3s ease-out;
}

.modal-container .message::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 2s infinite;
}

.modal-container .message.error {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.modal-container .message.success {
    color: #34d399;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.modal-container .password-strength {
    margin-top: 0.5rem;
    height: 3px;
    background: rgba(71, 85, 105, 0.3);
    border-radius: 2px;
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-container .password-strength.visible {
    opacity: 1;
}

.modal-container .strength-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #ff6b6b 0%, #feca57 50%, #48ca4e 100%);
    transition: width 0.3s ease, background 0.3s ease;
}

.modal-container .password-requirements {
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.75rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    background: rgba(30, 41, 59, 0.5);
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid rgba(71, 85, 105, 0.2);
}

.modal-container .password-requirements.visible {
    opacity: 1;
}

.modal-container .requirement {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.375rem;
    color: #64748b;
    transition: color 0.3s ease;
    font-size: 0.75rem;
}

.modal-container .requirement:last-child {
    margin-bottom: 0;
}

.modal-container .requirement.met {
    color: #34d399;
}

.modal-container .requirement i {
    font-size: 0.75rem;
    width: 12px;
    text-align: center;
}

.modal-container .loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

.modal-container .btn-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.modal-container .auth-link {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(71, 85, 105, 0.2);
    color: #94a3b8;
    font-size: 0.875rem;
}

.modal-container .auth-link a {
    color: #0ea5e9;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.modal-container .auth-link a:hover {
    color: #0284c7;
    text-decoration: underline;
}

.modal-container .floating-elements {
    display: none;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); opacity: 0.6; }
    50% { transform: translateY(-20px) scale(1.2); opacity: 1; }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}



    /* Enhanced mobile menu animations */
    .nav-menu {
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    /* Touch feedback for mobile devices */
    @media (hover: none) and (pointer: coarse) {
        .nav-link:active {
            background: rgba(0, 245, 255, 0.15);
            transform: scale(0.98);
        }

        .login-btn:active, .signup-btn:active {
            transform: scale(0.98);
            opacity: 0.9;
        }
    }
    
    /* Enhanced mobile form elements */
    .form-section {
        border-color: rgba(0, 245, 255, 0.15);
        background: rgba(0, 245, 255, 0.03);
    }
    
    .form-section:hover {
        border-color: rgba(0, 245, 255, 0.3);
        box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
    }
    
    .form-group input:focus,
    .form-group select:focus {
        border-color: #00f5ff;
        box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
        background: rgba(255, 255, 255, 0.08);
    }
    
    /* Mobile button enhancements */
    .cta-button, .calculate-btn, .action-btn {
        padding: 1.2rem 2.5rem;
        font-size: 1.1rem;
        touch-action: manipulation;
        -webkit-tap-highlight-color: rgba(0, 245, 255, 0.3);
    }
    
    .cta-button:active, .calculate-btn:active, .action-btn:active {
        transform: translateY(-1px) scale(0.98);
        box-shadow: 0 0 25px rgba(0, 245, 255, 0.4);
    }

    /* Show auth buttons in mobile menu */
    .mobile-auth {
        display: flex !important;
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
        padding: 1rem;
        border-top: 1px solid rgba(0, 245, 255, 0.2);
        margin-top: 1rem;
    }
}

/* Additional mobile optimizations */
@media (max-width: 480px) {
    /* Ensure proper viewport behavior */
    body {
        -webkit-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
    }

    /* Improve tap targets */
    .nav-item,
    .mobile-nav-item,
    .question-buttons button {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Better form spacing */
    .form-group {
        margin-bottom: 1.25rem;
    }

    /* Improved typography scaling */
    h2 {
        font-size: 1.5rem;
        line-height: 1.2;
    }

    h3 {
        font-size: 1.25rem;
    }

    h4 {
        font-size: 1.1rem;
    }

    /* Better spacing for cards */
    .feature-card,
    .progress-card,
    .result-card,
    .tip-card {
        margin-bottom: 1rem;
    }
}

/* Performance optimizations */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print styles */
@media print {
    .navbar,
    .mobile-menu,
    .floating-elements,
    .chat-container,
    .quick-questions {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .hero,
    .feature-card,
    .progress-card {
        background: white !important;
        border: 1px solid #ccc !important;
        box-shadow: none !important;
    }
}

/* Authentication Prompt Styles */
.auth-prompt {
    background: rgba(255, 245, 157, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 193, 7, 0.3);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    animation: slideInDown 0.5s ease-out;
}

.auth-prompt-content i {
    font-size: 3rem;
    color: #ffc107;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(255, 193, 7, 0.5);
}

.auth-prompt-content h3 {
    color: #ffffff;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.auth-prompt-content p {
    color: #e0e0e0;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.auth-prompt-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.auth-prompt .auth-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 0.9rem;
}

.auth-prompt .login-btn {
    background: transparent;
    border: 2px solid #00f5ff;
    color: #00f5ff;
}

.auth-prompt .login-btn:hover {
    background: rgba(0, 245, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

.auth-prompt .signup-btn {
    background: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
    color: #000;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

.auth-prompt .signup-btn:hover {
    background: linear-gradient(135deg, #00d4ff 0%, #00f5ff 100%);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
    transform: translateY(-2px);
}

/* Auth lock icon for actions */
.auth-lock {
    color: #ffc107;
    margin-left: auto;
    font-size: 0.9rem;
    opacity: 0.7;
}

.action-item {
    position: relative;
}

.action-item .auth-lock {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
}

/* Streak Celebration */
.streak-celebration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.5s ease-out;
}

.celebration-content {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(0, 245, 255, 0.3);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    animation: bounceIn 0.8s ease-out;
}

.celebration-content i {
    font-size: 4rem;
    color: #ff6b35;
    margin-bottom: 1rem;
    text-shadow: 0 0 30px rgba(255, 107, 53, 0.8);
    animation: pulse 2s infinite;
}

.celebration-content h3 {
    color: #ffffff;
    font-size: 2rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.celebration-content p {
    color: #e0e0e0;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.streak-number {
    color: #00f5ff !important;
    font-size: 1.5rem !important;
    font-weight: bold;
    text-shadow: 0 0 20px rgba(0, 245, 255, 0.8);
}

/* Error Message */
.error-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(248, 113, 113, 0.95);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(248, 113, 113, 0.5);
    border-radius: 10px;
    padding: 1rem 1.5rem;
    z-index: 9999;
    animation: slideInRight 0.5s ease-out;
    max-width: 400px;
}

.error-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #ffffff;
    font-weight: 500;
}

.error-content i {
    font-size: 1.2rem;
    color: #fca5a5;
}

/* Animations */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Mobile responsive for auth elements */
@media (max-width: 768px) {
    .auth-prompt {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    .auth-prompt-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .celebration-content {
        margin: 1rem;
        padding: 2rem;
    }
    
    .celebration-content h3 {
        font-size: 1.5rem;
    }
    
    .error-message {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
}