:root {
    --color-bg: #0a0e17;
    --color-bg-alt: #111827;
    --color-surface: #1a2234;
    --color-border: #2a3548;
    --color-text: #e8ecf4;
    --color-text-muted: #8b95a8;
    --color-primary: #3b9eff;
    --color-primary-hover: #5cb0ff;
    --color-accent: #00d4aa;
    --color-danger: #ff6b6b;
    --color-success: #00d4aa;
    --font-sans: "DM Sans", system-ui, sans-serif;
    --font-mono: "JetBrains Mono", monospace;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --container: 1120px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.15s;
}

a:hover {
    color: var(--color-primary-hover);
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.1rem;
}

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

.logo-img {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    flex-shrink: 0;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-brand .logo-img {
    width: 40px;
    height: 40px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--color-text-muted);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    background: var(--color-surface);
}

.nav-cta {
    background: var(--color-primary);
    color: var(--color-bg) !important;
    margin-left: 0.5rem;
}

.nav-cta:hover {
    background: var(--color-primary-hover);
    color: var(--color-bg) !important;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    transition: 0.2s;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: var(--color-bg);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.btn-lg {
    padding: 0.85rem 1.75rem;
    font-size: 1rem;
}

/* Hero */
.hero {
    padding: 5rem 0 4rem;
    background: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(59, 158, 255, 0.15), transparent);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1.25rem;
}

.hero-lead {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-photo {
    width: 100%;
    max-width: 380px;
    height: auto;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-lg);
    border: 3px solid var(--color-border);
    box-shadow: var(--shadow);
}

/* Sections */
.section {
    padding: 4rem 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
}

.section-header p {
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

.link-arrow {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Features */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: border-color 0.2s;
}

.feature-card:hover {
    border-color: var(--color-primary);
}

.feature-icon {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

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

/* Posts */
.post-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
}

.post-card time {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.post-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.post-card h3 a {
    color: var(--color-text);
}

.post-card h3 a:hover {
    color: var(--color-primary);
}

.post-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    flex: 1;
    margin-bottom: 1rem;
}

.read-more {
    font-size: 0.85rem;
    font-weight: 600;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.post-list-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.post-list-item time {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.post-list-content h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.post-list-content h2 a {
    color: var(--color-text);
}

.post-list-content h2 a:hover {
    color: var(--color-primary);
}

.post-list-content p {
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

/* Post article */
.page-hero {
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

.page-lead {
    color: var(--color-text-muted);
    font-size: 1.15rem;
    margin-top: 0.75rem;
}

.post-header {
    padding: 3rem 0 2rem;
}

.post-header time {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.post-header h1 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    margin: 0.75rem 0;
    line-height: 1.2;
}

.post-summary {
    font-size: 1.15rem;
    color: var(--color-text-muted);
}

.preview-banner {
    background: var(--color-danger);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: inline-block;
}

.prose {
    max-width: 720px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.prose h2, .prose h3, .prose h4 {
    margin: 2rem 0 1rem;
    line-height: 1.3;
}

.prose p {
    margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
    margin: 0 0 1.25rem 1.5rem;
}

.prose li {
    margin-bottom: 0.5rem;
}

.prose code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-surface);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

.prose pre {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.prose pre code {
    background: none;
    padding: 0;
}

.prose blockquote {
    border-left: 3px solid var(--color-primary);
    padding-left: 1.25rem;
    color: var(--color-text-muted);
    margin: 1.5rem 0;
}

.prose img {
    max-width: 100%;
    border-radius: var(--radius);
}

.prose a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.post-body {
    padding: 2rem 0 4rem;
}

.post-footer-cta {
    text-align: center;
}

.post-footer-cta p {
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}

/* Schedule */
.schedule-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: start;
}

.schedule-topics {
    list-style: none;
    margin: 1.5rem 0 2rem;
}

.schedule-topics li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-muted);
}

.schedule-topics li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

.schedule-embed iframe {
    width: 100%;
    height: 600px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
}

.embed-fallback {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Origin story */
.origin-section {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    padding: 4rem 0;
}

.origin-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
    max-width: 680px;
    margin: 0 auto;
}

.origin-figure {
    margin: 0;
    width: 100%;
}

.origin-figure img {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow);
}

.origin-figure figcaption {
    margin-top: 0.75rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.origin-header {
    width: 100%;
    text-align: center;
}

.origin-header h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.3;
}

.origin-body {
    width: 100%;
}

.origin-body p {
    color: var(--color-text-muted);
    margin-bottom: 1.1rem;
    line-height: 1.75;
}

.origin-body em {
    color: var(--color-text);
    font-style: italic;
}

.origin-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.5rem;
}

/* Audience paths */
.path-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
.path-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.path-card-highlight {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(59, 158, 255, 0.08), rgba(0, 212, 170, 0.05));
}

.path-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-accent);
}

.path-card h3 {
    font-size: 1.25rem;
}

.path-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    flex: 1;
}

.path-card .btn {
    align-self: flex-start;
    margin-top: 0.5rem;
}

.page-hero-accent {
    background: radial-gradient(ellipse 70% 50% at 50% -10%, rgba(0, 212, 170, 0.12), transparent);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.audience-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.audience-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

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

.learn-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 760px;
}

.learn-item {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    padding: 1.25rem 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.learn-number {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    flex-shrink: 0;
    padding-top: 0.15rem;
}

.learn-item h3 {
    font-size: 1.05rem;
    margin-bottom: 0.35rem;
}

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

/* CTA */
.cta-section {
    background: linear-gradient(135deg, rgba(59, 158, 255, 0.1), rgba(0, 212, 170, 0.08));
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.cta-inner {
    text-align: center;
    max-width: 600px;
}

.cta-inner h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.cta-inner p {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 3rem 0;
    margin-top: auto;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: start;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 0.75rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

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

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

.footer-copy {
    grid-column: 1 / -1;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

/* Flash messages */
.flash-container {
    padding-top: 1rem;
}

.flash {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.flash-error {
    background: rgba(255, 107, 107, 0.15);
    color: var(--color-danger);
    border: 1px solid rgba(255, 107, 107, 0.3);
}

.flash-success {
    background: rgba(0, 212, 170, 0.15);
    color: var(--color-success);
    border: 1px solid rgba(0, 212, 170, 0.3);
}

/* Admin */
.admin-section {
    min-height: 60vh;
}

.admin-card {
    max-width: 400px;
    margin: 2rem auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.admin-card h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.admin-subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.admin-actions {
    display: flex;
    gap: 0.75rem;
}

.admin-form label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--color-text-muted);
}

.admin-form input[type="text"],
.admin-form input[type="password"],
.admin-form textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
}

.admin-form textarea {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    resize: vertical;
}

.admin-form-wide {
    max-width: 1100px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-field {
    min-width: 0;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    cursor: pointer;
}

.checkbox-label input {
    width: auto;
    margin: 0;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.admin-table th,
.admin-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.admin-table th {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(0, 212, 170, 0.15);
    color: var(--color-success);
}

.badge-draft {
    background: rgba(139, 149, 168, 0.15);
    color: var(--color-text-muted);
}

.table-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.inline-form {
    display: inline;
}

.link-btn {
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    padding: 0;
}

.link-btn.danger {
    color: var(--color-danger);
}

.about-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.about-hero {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.about-photo img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid var(--color-border);
    box-shadow: var(--shadow);
}

.about-intro h1 {
    margin-bottom: 0.5rem;
}

@media (max-width: 640px) {
    .about-hero {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .about-photo img {
        width: 160px;
        height: 160px;
    }
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--color-text-muted);
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 3rem;
}

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

/* Responsive */
@media (max-width: 900px) {
    .hero-inner,
    .feature-grid,
    .post-grid,
    .schedule-layout,
    .form-row,
    .path-grid,
    .audience-grid {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        order: -1;
    }

    .post-list-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 640px) {
    .audience-grid {
        grid-template-columns: 1fr;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg-alt);
        border-bottom: 1px solid var(--color-border);
        padding: 1rem;
    }

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

    .nav-cta {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 3rem 0 2rem;
    }
}