/* Landing Page Styles - Material Design */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Fresh teal / citrus palette */
    --primary-color: #0f9b8e;
    --primary-dark: #0b7c6d;
    --primary-light: #1fc8a9;
    --secondary-color: #ffb347;
    --accent-color: #ffe259;
    
    /* Surface Colors */
    --surface: #ffffff;
    --surface-variant: #f5f5f5;
    --background: #fafafa;
    --error: #f44336;
    --warning: #ff9800;
    --success: #4caf50;
    
    /* Text Colors */
    --on-surface: #212121;
    --on-surface-variant: #757575;
    --on-primary: #ffffff;
    
    /* Elevation Shadows */
    --elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --elevation-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    --elevation-4: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

html {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background);
    color: var(--on-surface);
    line-height: 1.6;
    overflow-x: hidden;
    overflow-y: auto;
    min-height: 100vh;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--surface);
    box-shadow: var(--elevation-2);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo .material-icons {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: var(--on-surface);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--on-surface);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background-color: var(--surface-variant);
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-xxl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--on-primary);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h2 {
    font-size: 3rem;
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xxl);
    opacity: 0.9;
}

.login-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.login-link {
    flex: 1;
    min-width: 240px;
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: rgba(255,255,255,0.2);
    color: var(--on-primary);
    border-radius: 999px;
    text-decoration: none;
    font-weight: 500;
    box-shadow: var(--elevation-2);
    backdrop-filter: blur(6px);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
    position: relative;
    overflow: hidden;
    background-size: 200% auto;
}

.login-link::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255,255,255,0.25), transparent, rgba(255,255,255,0.15));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.login-link::before {
    content: '';
    position: absolute;
    inset: -20px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(255,255,255,0.25) 0%, transparent 60%);
    opacity: 0;
    transform: scale(0.6);
}

.login-link:hover {
    transform: translateY(-3px) scale(1.01);
    box-shadow: var(--elevation-3);
    background-color: rgba(255,255,255,0.3);
    background-position: right center;
}

.login-link:hover::after {
    opacity: 1;
}

.login-link:hover::before {
    opacity: 1;
    animation: glowPulse 1.3s ease-out forwards;
}

.login-link .material-icons {
    font-size: 2rem;
}

.login-link .material-icons:first-child {
    font-size: 2.2rem;
    padding: 12px;
    border-radius: var(--radius-lg);
    background-color: rgba(0,0,0,0.12);
}

.login-link .arrow {
    opacity: 0.7;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.login-link:hover .arrow {
    transform: translateX(4px);
    opacity: 1;
}

.login-link-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: left;
}

.login-link-text strong {
    font-size: 1.1rem;
    letter-spacing: 0.08em;
}

.admin-link {
    border: none;
    background-image: linear-gradient(120deg, rgba(255,255,255,0.15), transparent), linear-gradient(135deg, #0f9b8e, #ffb347);
    box-shadow: 0 15px 25px rgba(15, 155, 142, 0.35);
}

.user-link {
    border: none;
    background-image: linear-gradient(120deg, rgba(255,255,255,0.15), transparent), linear-gradient(135deg, #1261a0, #1fc8a9);
    box-shadow: 0 15px 25px rgba(18, 97, 160, 0.35);
}

@keyframes glowPulse {
    0% { opacity: 0; transform: scale(0.95); }
    50% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 0; transform: scale(1.05); }
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.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 var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--on-primary);
    box-shadow: var(--elevation-2);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: var(--elevation-3);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--surface);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: var(--elevation-1);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--on-primary);
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.dashboard-preview {
    width: 400px;
    height: 300px;
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--elevation-4);
    overflow: hidden;
    position: relative;
}

.preview-header {
    height: 48px;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
}

.preview-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-item {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.3);
}

.nav-item.active {
    background-color: var(--on-primary);
}

.preview-content {
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.preview-card {
    height: 60px;
    background-color: var(--surface-variant);
    border-radius: var(--radius-sm);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Features Section */
.features {
    padding: var(--spacing-xxl) 0;
    background-color: var(--surface);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-xxl);
    color: var(--on-surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    background-color: var(--background);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elevation-2);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: var(--on-primary);
}

.feature-icon .material-icons {
    font-size: 2.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--on-surface);
}

.feature-card p {
    color: var(--on-surface-variant);
    line-height: 1.6;
}

/* About Section */
.about {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    color: var(--on-surface);
}

.about-text p {
    font-size: 1.125rem;
    color: var(--on-surface-variant);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--elevation-1);
}

.stat h3 {
    font-size: 2rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat p {
    color: var(--on-surface-variant);
    font-weight: 500;
}

.tech-stack {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.tech-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--surface);
    border-radius: var(--radius-md);
    box-shadow: var(--elevation-1);
    transition: all var(--transition-fast);
}

.tech-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.tech-item .material-icons {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.tech-item span:last-child {
    font-weight: 500;
    color: var(--on-surface);
}

/* Contact Section */
.contact {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-color);
    color: var(--on-primary);
    text-align: center;
}

.contact h2 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
}

.contact p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xxl);
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
}

.contact-item .material-icons {
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background-color: var(--on-surface);
    color: var(--on-primary);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: var(--on-primary);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-section ul li a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 64px; /* ensure content not hidden behind fixed header */
    }
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .login-options {
        flex-direction: column;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .tech-stack {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .nav {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: 80px 0 var(--spacing-xl);
        margin-top: 0;
    }
    
    .hero-content h2 {
        font-size: 1.75rem;
    }
    
    .login-link {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .dashboard-preview {
        width: 300px;
        height: 200px;
    }
    
    .features h2,
    .about-text h2,
    .contact h2 {
        font-size: 2rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-in-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-in-out;
}

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

/* Focus States for Accessibility */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading 1.5s infinite;
}

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