:root {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary: #3b82f6;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --accent: #6366f1;
    --app-brand: #00796B;
    --app-brand-light: #e0f2f1;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-full: 9999px;
    --max-w: 1160px;
    --transition: 0.2s ease-in-out;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-main: #090d16;
        --bg-surface: #111726;
        --bg-surface-elevated: #1a2236;
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --border-color: #1e293b;
        --primary: #60a5fa;
        --primary-hover: #93c5fd;
        --primary-light: rgba(59, 130, 246, 0.15);
        --accent: #818cf8;
        --app-brand: #14b8a6;
        --app-brand-light: rgba(20, 184, 166, 0.15);
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
        --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.5);
        --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.7);
    }
}

[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary: #3b82f6;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --accent: #6366f1;
    --app-brand: #00796B;
    --app-brand-light: #e0f2f1;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] {
    --bg-main: #090d16;
    --bg-surface: #111726;
    --bg-surface-elevated: #1a2236;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #1e293b;
    --primary: #60a5fa;
    --primary-hover: #93c5fd;
    --primary-light: rgba(59, 130, 246, 0.15);
    --accent: #818cf8;
    --app-brand: #14b8a6;
    --app-brand-light: rgba(20, 184, 166, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.7);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.5px;
}

.brand-logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

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

.lang-selector {
    display: flex;
    align-items: center;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 3px;
}

.lang-btn {
    padding: 3px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

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

.theme-toggle-btn {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 34px;
    height: 34px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

.hero {
    padding: 80px 0 50px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    max-width: 860px;
    margin: 0 auto 20px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 660px;
    margin: 0 auto 36px;
}

.store-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 22px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: var(--bg-surface);
    color: var(--text-main);
    border-color: var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-brand {
    background: var(--app-brand);
    color: #fff;
}

.btn-brand:hover {
    background: #004D40;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 80px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: left;
    box-shadow: var(--shadow-sm);
}

.stat-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 48px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.75px;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.vc-theme {
    --primary: var(--app-brand);
    --primary-light: var(--app-brand-light);
    --primary-hover: #004D40;
}

.categories-strip {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.category-chip {
    padding: 8px 16px;
    border-radius: var(--radius-full);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.showcase-stream {
    display: flex;
    flex-direction: column;
    gap: 72px;
    margin: 40px 0 72px;
}

.showcase-row {
    display: flex;
    align-items: center;
    gap: 48px;
}

.showcase-row-reverse {
    flex-direction: row-reverse;
}

.showcase-mockup-wrapper {
    flex: 0 0 300px;
}

.showcase-content {
    flex: 1;
}

.showcase-step-num {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary);
    opacity: 0.35;
    line-height: 1;
    margin-bottom: 8px;
}

.showcase-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 14px;
}

.showcase-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.phone-mockup {
    background: #000;
    border: 6px solid #1e293b;
    border-radius: 32px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
    aspect-ratio: 9 / 19.5;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.phone-mockup img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.compare-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 64px;
    overflow-x: auto;
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.compare-table th, .compare-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.compare-table th {
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.compare-highlight {
    font-weight: 700;
    color: var(--app-brand);
}

.page-header {
    padding: 50px 0 30px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 12px;
}

.page-lead {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 680px;
}

.prose-block {
    max-width: 780px;
}

.prose-block h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 28px 0 12px;
}

.prose-block p {
    color: var(--text-muted);
    margin-bottom: 16px;
}

.projects-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.tag-active {
    background: #dcfce7;
    color: #15803d;
}

.tag-dev {
    background: #fef9c3;
    color: #854d0e;
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
}

.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-main);
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
}

.site-footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 24px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-heading {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-link {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

@media (max-width: 992px) {
    .hero-title { font-size: 2.5rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .showcase-row, .showcase-row-reverse {
        flex-direction: column;
        text-align: center;
        gap: 28px;
    }
    .showcase-mockup-wrapper {
        flex: auto;
    }
    .projects-list { grid-template-columns: 1fr; }
    .contact-layout { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        gap: 16px;
    }
    .mobile-menu-btn { display: block; }
    .hero-title { font-size: 2rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}