/* ===== CSS Variables - Light (default) ===== */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --border: #e2e8f0;
    --shadow: rgba(15, 23, 42, 0.08);
    --shadow-lg: rgba(15, 23, 42, 0.12);
}

/* ===== Dark theme ===== */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.2);
    --shadow-lg: rgba(0, 0, 0, 0.35);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 3px var(--shadow);
    transition: background 0.3s, border-color 0.3s;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.9;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    width: 42px;
    height: 42px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
    background: var(--border);
}

.theme-icon {
    font-size: 1.2rem;
}

.theme-icon.moon {
    display: none;
}

[data-theme="dark"] .theme-icon.sun {
    display: none;
}

[data-theme="dark"] .theme-icon.moon {
    display: inline;
}

.mobile-menu-btn {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    font-size: 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
}

.mobile-nav {
    display: none;
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.mobile-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem;
    font-weight: 500;
}

.mobile-nav.open {
    display: flex;
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
}

/* ===== Hero ===== */
.hero {
    padding: 4rem 0 5rem;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 0.75rem;
}

.hero-desc {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: background 0.2s, transform 0.2s;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ===== Sections ===== */
.section {
    padding: 3rem 0;
}

.section h2 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

/* ===== Features ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
    box-shadow: 0 8px 24px var(--shadow-lg);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* ===== Who ===== */
.who {
    background: var(--bg-secondary);
    transition: background 0.3s;
}

.who-list {
    list-style: none;
    max-width: 560px;
    margin: 0 auto;
}

.who-list li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
}

.who-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* ===== Privacy preview ===== */
.privacy-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.privacy-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.privacy-card span {
    color: var(--accent);
    font-size: 1.25rem;
    font-weight: bold;
}

.privacy-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* ===== CTA ===== */
.cta {
    background: var(--bg-secondary);
    text-align: center;
    transition: background 0.3s;
}

.cta-text {
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 1.5rem;
}

.category-tags {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 3rem 0 2rem;
    margin-top: 3rem;
    transition: background 0.3s, border-color 0.3s;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer-contact p,
.footer-team p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.footer-contact a {
    color: var(--accent);
    text-decoration: none;
}

.footer-copy {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* ===== Legal pages (Privacy & Terms) ===== */
.legal-page {
    padding: 2rem 0 4rem;
    min-height: 80vh;
}

.legal-page .container {
    max-width: 720px;
}

.legal-page h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.legal-page .back-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
    margin-bottom: 2rem;
    font-weight: 500;
}

.legal-page .back-link:hover {
    text-decoration: underline;
}

.legal-page h2 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.legal-page p,
.legal-page li {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.legal-page ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.legal-page .updated {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}