/* CSS Variables for Light Mode */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #6c757d;
    --border-color: #e9ecef;
    --accent-primary: #1a3a6b;
    --accent-secondary: #d4a843;
    --accent-gradient: linear-gradient(135deg, #1a3a6b 0%, #d4a843 100%);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0d0d14;
        --bg-secondary: #16161f;
        --bg-card: #1a1a27;
        --text-primary: #f0f0f5;
        --text-secondary: #a8a8b8;
        --text-muted: #6b6b7b;
        --border-color: #2a2a3a;
        --accent-primary: #4a7abf;
        --accent-secondary: #e8c066;
        --accent-gradient: linear-gradient(135deg, #4a7abf 0%, #e8c066 100%);
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-secondary);
}

/* Header & Navigation */
header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
}

.logo-link:hover {
    color: var(--text-primary);
}

.app-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-icon img {
    border-radius: 9px;
}

.app-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
}

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
    background: var(--bg-secondary);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Features Section */
.features {
    padding: 80px 0;
}

.features h2,
.faq h2,
.contact h2 {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.2s ease;
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* FAQ Section */
.faq {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-item summary {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s ease;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent-primary);
    transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    background: var(--bg-secondary);
}

.faq-item p {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Contact Section */
.contact {
    padding: 80px 0;
}

.contact-intro {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(26, 58, 107, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.contact-form .btn {
    width: 100%;
}

/* Privacy Policy Page */
.privacy-policy {
    padding: 60px 0 80px;
}

.privacy-policy h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.last-updated {
    color: var(--text-muted);
    margin-bottom: 40px;
    font-size: 0.95rem;
}

.policy-content {
    max-width: 800px;
}

.policy-section {
    margin-bottom: 40px;
}

.policy-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    text-align: left;
}

.policy-section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.policy-section ul {
    margin-left: 24px;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.policy-section li {
    margin-bottom: 8px;
    line-height: 1.7;
}

.policy-section strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .tagline {
        font-size: 1.1rem;
        padding: 0 16px;
    }

    .hero-buttons {
        flex-direction: column;
        padding: 0 40px;
    }

    .features h2,
    .faq h2,
    .contact h2 {
        font-size: 1.75rem;
    }

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

    .contact-form {
        padding: 24px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-brand .logo {
        justify-content: center;
    }

    .privacy-policy h1 {
        font-size: 2rem;
    }

    .policy-section h2 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    nav {
        padding: 12px 16px;
    }

    .hero {
        padding: 48px 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .features,
    .faq,
    .contact {
        padding: 48px 0;
    }

    .feature-card {
        padding: 24px;
    }

    .faq-item summary {
        padding: 16px 20px;
        font-size: 0.95rem;
    }

    .faq-item p {
        padding: 0 20px 16px;
        font-size: 0.95rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}