:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-surface-alt: #f4fbf6;
    --color-header-bg: rgba(255, 255, 255, 0.95);
    --color-header-border: rgba(15, 23, 42, 0.08);
    --color-text: #1f2937;
    --color-text-muted: #4b5563;
    --color-text-contrast: #ffffff;
    --color-primary: #1f7a33;
    --color-primary-accent: #28a745;
    --color-primary-hover: #155623;
    --color-primary-soft: #e6f5eb;
    --color-primary-border: rgba(31, 122, 51, 0.18);
    --color-link: #1f7a33;
    --color-link-hover: #155623;
    --color-footer-bg: #111827;
    --color-footer-text: #e5e7eb;
    --shadow-soft: 0 2px 12px rgba(15, 23, 42, 0.08);
    --shadow-card: 0 18px 40px rgba(15, 23, 42, 0.08);
    --shadow-card-hover: 0 22px 48px rgba(15, 23, 42, 0.12);
    color-scheme: light;
}

.dark {
    --color-bg: #0f172a;
    --color-surface: #111c2f;
    --color-surface-alt: #152137;
    --color-header-bg: rgba(15, 23, 42, 0.85);
    --color-header-border: rgba(148, 163, 184, 0.2);
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-contrast: #05172a;
    --color-primary: #22c55e;
    --color-primary-accent: #34d399;
    --color-primary-hover: #16a34a;
    --color-primary-soft: rgba(34, 197, 94, 0.14);
    --color-primary-border: rgba(34, 197, 94, 0.35);
    --color-link: #7dd3fc;
    --color-link-hover: #38bdf8;
    --color-footer-bg: #020617;
    --color-footer-text: #cbd5f5;
    --shadow-soft: 0 18px 36px rgba(2, 6, 23, 0.55);
    --shadow-card: 0 24px 60px rgba(15, 23, 42, 0.55);
    --shadow-card-hover: 0 32px 72px rgba(15, 23, 42, 0.65);
    color-scheme: dark;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color 200ms ease, color 200ms ease;
}

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

.container h2 {
    text-align: center;
}

.header {
    background-color: var(--color-header-bg);
    box-shadow: var(--shadow-soft);
    border-bottom: 1px solid var(--color-header-border);
    position: fixed;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(14px);
}

body.has-session-banner .header {
    top: 64px;
}

body:not(.has-session-banner) .header {
    top: 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
}

.logo img {
    height: 80px;
}

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

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: color 160ms ease;
}

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

.nav-links .nav-link {
    padding: 0.5rem 1.25rem;
    border-radius: 999px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

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

.nav-links .nav-link.highlight {
    background-color: var(--color-primary);
    color: var(--color-text-contrast, #ffffff);
    border-color: var(--color-primary);
}

.nav-links .nav-link.highlight:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.theme-toggle {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 0.45rem 1.1rem;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    appearance: none;
}

.theme-toggle:hover {
    background-color: var(--color-primary-soft);
    background-color: color-mix(in srgb, var(--color-primary-soft) 70%, var(--color-primary) 30%);
    border-color: var(--color-primary-border);
    transform: translateY(-1px);
}

.theme-toggle:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
    outline-offset: 2px;
}

.theme-toggle[data-theme="dark"] {
    color: var(--color-link);
}

.theme-toggle-label {
    letter-spacing: 0.01em;
}

.hero {
    background-color: var(--color-surface);
    padding: 100px 0 50px;
    transition: background-color 200ms ease;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 2;
    padding-right: 2rem;
}

.hero-img {
    flex: 1;
    max-width: 50%;
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    transition: box-shadow 200ms ease, transform 200ms ease;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-btn {
    display: inline-block;
    background-color: var(--color-primary-accent);
    color: var(--color-text-contrast, #ffffff);
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
    box-shadow: 0 10px 24px rgba(31, 122, 51, 0.15);
}

.cta-btn:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 12px 28px rgba(21, 86, 35, 0.22);
    transform: translateY(-1px);
}

.cta-btn.secondary {
    background-color: transparent;
    color: var(--color-primary-accent);
    border: 2px solid var(--color-primary-accent);
}

.cta-btn.secondary:hover {
    background-color: var(--color-primary-soft);
}

.cta-link {
    display: inline-block;
    font-weight: 600;
    color: var(--color-link);
    transition: color 0.2s ease;
}

.cta-link:hover {
    text-decoration: underline;
    color: var(--color-link-hover);
}

.hero-subtext {
    margin: 1rem 0 2rem;
    max-width: 520px;
    color: var(--color-text-muted);
    transition: color 200ms ease;
}

.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.features {
    padding: 5rem 0;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--color-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-hover);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

.documentation, .cta {
    background-color: var(--color-surface);
    padding: 5rem 0;
    text-align: center;
    transition: background-color 200ms ease;
}

.public-feed {
    padding: 5rem 0;
    background-color: var(--color-surface-alt);
    transition: background-color 200ms ease;
}

.public-feed__header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 2.5rem;
}

.public-feed__header p {
    color: var(--color-text-muted);
    margin-top: 0.75rem;
}


.public-feed-rotator {
    position: relative;
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    background: var(--color-bg);
    margin-bottom: 1.5rem;
    padding: clamp(2rem, 4vw, 3rem);
}

.public-feed-card {
    position: relative;
    background: var(--color-bg);
    background: color-mix(in srgb, var(--color-bg) 85%, var(--color-primary-soft) 15%);
    border-radius: 18px;
    padding: clamp(1.5rem, 3vw, 2rem);
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    max-width: 640px;
    margin: 0 auto;
    transition: opacity 0.3s ease;
    border: 1px solid var(--color-primary-border);
}

.public-feed-card h3 {
    font-size: clamp(1.1rem, 2.2vw, 1.35rem);
}

.public-feed-card p {
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.6;
}

.public-feed-card__meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.public-feed-card__meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.public-feed-card__meta span::before {
    content: '•';
    font-size: 0.75rem;
    opacity: 0.6;
}

.public-feed-card__meta span:first-child::before {
    content: '';
}


.public-feed-card--loading {
    background: repeating-linear-gradient(135deg, var(--color-surface), var(--color-surface) 16px, var(--color-bg) 16px, var(--color-bg) 32px);
    color: var(--color-text-muted);
    padding: clamp(1.5rem, 3vw, 2rem);
    border-radius: 18px;
    animation: feedPulse 1.6s ease-in-out infinite;
}

@keyframes feedPulse {
    0%, 100% { opacity: 0.75; }
    50% { opacity: 1; }
}

.public-feed-empty {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.public-feed-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.public-feed-control {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--color-primary-border);
    background: var(--color-bg);
    color: var(--color-primary);
    font-size: 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.public-feed-control:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
    background: color-mix(in srgb, var(--color-primary-soft) 60%, transparent);
}

.public-feed-control:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
    outline-offset: 3px;
}

.public-feed-dots {
    display: inline-flex;
    gap: 0.5rem;
}

.public-feed-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--color-primary-border);
    transition: width 0.25s ease, background-color 0.25s ease;
}

.public-feed-dot.is-active {
    width: 28px;
    background: var(--color-primary);
}

.public-feed__actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.access {
    padding: 5rem 0;
    background-color: var(--color-bg);
    text-align: center;
    transition: background-color 200ms ease;
}

.access-intro {
    max-width: 640px;
    margin: 1rem auto 3rem;
    color: var(--color-text-muted);
}

.access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
}

.access-card {
    padding: 2rem;
    border-radius: 18px;
    box-shadow: var(--shadow-card);
    background-color: var(--color-surface-alt);
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    border: 1px solid transparent;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.access-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary-border);
    box-shadow: var(--shadow-card-hover);
}

.access-card h3 {
    margin-bottom: 0.5rem;
}

.card-link {
    color: var(--color-link);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s ease;
}

.card-link:hover {
    text-decoration: underline;
    color: var(--color-link-hover);
}

.doc-btn {
    display: inline-block;
    background-color: var(--color-primary-accent);
    color: var(--color-text-contrast, #ffffff);
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    margin-top: 1rem;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 10px 24px rgba(31, 122, 51, 0.15);
}

.doc-btn:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 12px 28px rgba(21, 86, 35, 0.22);
    transform: translateY(-1px);
}

.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 2rem 0;
    transition: background-color 200ms ease;
}

.session-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: color-mix(in srgb, var(--color-primary-soft) 65%, var(--color-bg) 35%);
    color: var(--color-text);
    border-bottom: 1px solid var(--color-primary-border);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.14);
    z-index: 1200;
    font-size: 0.95rem;
}

.session-banner strong {
    font-weight: 700;
}

.session-banner__link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: underline;
}

.session-banner__link:hover {
    text-decoration: none;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.social-links a {
    color: var(--color-footer-text);
    margin-left: 1rem;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.social-links a:hover {
    opacity: 0.75;
}

@media (max-width: 768px) {
    .hero .container {
        flex-direction: column;
    }

    .hero-content, .hero-img {
        flex: 1;
        max-width: 100%;
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }

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

    .cta-btn.secondary {
        margin-left: 0;
    }

    .theme-toggle-label {
        display: none;
    }

    .public-feed-rotator {
        padding: 1.75rem 1.25rem;
    }
}