/* ========================================
   PlainHub About Page — Pattern B
   Document / Manual style LP
   ======================================== */

/* ========================================
   Design Tokens (SSOT)
   ======================================== */
:root {
    --color-accent: #0e639c;
    --color-accent-hover: #1177bb;
    --color-bg: #1e1e1e;
    --color-bg-alt: #252526;
    --color-bg-elevated: #2d2d30;
    --color-border: #3e3e42;
    --color-text: #d4d4d4;
    --color-text-muted: #999999;
    --color-text-dim: #666666;
    --color-heading: #ffffff;
    --color-link: #cccccc;
    --color-bg-rgb: 30, 30, 30;
    --color-on-accent: #ffffff;
}

/* Light theme — manual toggle */
:root.light {
    --color-accent: #0e639c;
    --color-accent-hover: #0b4f7d;
    --color-on-accent: #ffffff;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f5;
    --color-bg-elevated: #e8e8e8;
    --color-border: #d0d0d0;
    --color-text: #333333;
    --color-text-muted: #666666;
    --color-text-dim: #999999;
    --color-heading: #1a1a1a;
    --color-link: #555555;
    --color-bg-rgb: 255, 255, 255;
}

/* Light theme — OS preference (unless user chose dark) */
@media (prefers-color-scheme: light) {
    :root:not(.dark) {
        --color-accent: #0e639c;
        --color-accent-hover: #0b4f7d;
        --color-on-accent: #ffffff;
        --color-bg: #ffffff;
        --color-bg-alt: #f5f5f5;
        --color-bg-elevated: #e8e8e8;
        --color-border: #d0d0d0;
        --color-text: #333333;
        --color-text-muted: #666666;
        --color-text-dim: #999999;
        --color-heading: #1a1a1a;
        --color-link: #555555;
        --color-bg-rgb: 255, 255, 255;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1012px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Header (fixed)
   ======================================== */
header {
    padding: 16px 0;
    background: rgba(var(--color-bg-rgb), 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo img, .logo svg {
    display: block;
}

/* ライトモード時のロゴ色反転（img経由でcurrentColorが効かないブラウザ用フォールバック） */
:root.light .logo img {
    filter: invert(1) hue-rotate(180deg);
}

@media (prefers-color-scheme: light) {
    :root:not(.dark) .logo img {
        filter: invert(1) hue-rotate(180deg);
    }
}

.logo:hover {
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--color-link);
    font-size: 0.9em;
    transition: color 0.3s;
}

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

.cta-button {
    background: var(--color-accent);
    color: var(--color-on-accent) !important;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.9em;
    transition: background 0.3s;
}

.cta-button:hover {
    background: var(--color-accent-hover);
    text-decoration: none;
}

/* ========================================
   Hero Section (compact)
   ======================================== */
.hero {
    margin-top: 60px;
    padding: 80px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 2.8em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 300;
}

.hero .tagline {
    font-size: 1.25em;
    color: var(--color-link);
    margin-bottom: 12px;
}

.hero p {
    color: var(--color-text-muted);
    font-size: 1.05em;
    margin-bottom: 32px;
    line-height: 1.8;
}

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

.btn-primary {
    background: var(--color-accent);
    color: var(--color-on-accent);
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 1em;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    text-decoration: none;
}

.btn-secondary {
    background: transparent;
    color: var(--color-link);
    padding: 12px 24px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1em;
    transition: all 0.3s;
}

.btn-secondary:hover {
    border-color: var(--color-link);
    color: var(--color-heading);
    text-decoration: none;
}

/* ========================================
   Document Section (primary building block)
   ======================================== */
.doc-section {
    padding: 48px 0;
}

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

.doc-section h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 400;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.doc-section h3 {
    font-size: 1.25em;
    color: var(--color-heading);
    margin-top: 28px;
    margin-bottom: 12px;
    font-weight: 500;
}

.doc-section h4 {
    font-size: 1.1em;
    color: var(--color-link);
    margin-top: 28px;
    margin-bottom: 10px;
    font-weight: 500;
}

.doc-section h5 {
    font-size: 1em;
    color: var(--color-link);
    margin-top: 20px;
    margin-bottom: 8px;
    font-weight: 500;
}

.doc-section p {
    color: var(--color-text);
    margin-bottom: 16px;
}

.doc-section .lead {
    font-size: 1.1em;
    color: var(--color-link);
    margin-bottom: 24px;
}

.doc-section .comparison {
    color: var(--color-link);
    margin-top: 16px;
    font-weight: 500;
}

/* ========================================
   Tables (document style)
   ======================================== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
    font-size: 0.95em;
}

th {
    background: var(--color-bg-elevated);
    color: var(--color-link);
    padding: 8px 14px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--color-border);
}

td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    vertical-align: top;
}

tr:last-child td {
    border-bottom: none;
}

td code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
    color: var(--color-text);
}

/* ========================================
   Feature Lists
   ======================================== */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 12px 0 20px;
}

.feature-list li {
    padding: 6px 0 6px 20px;
    position: relative;
    color: var(--color-text);
    line-height: 1.8;
}

.feature-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

.feature-list li strong {
    color: var(--color-heading);
}

/* ========================================
   Blockquote
   ======================================== */
blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 8px 16px;
    margin: 20px 0;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    font-style: italic;
}

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

/* ========================================
   Detail Block (indented subsection)
   ======================================== */
.detail-block {
    margin-top: 32px;
    padding: 24px;
    background: var(--color-bg-elevated);
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
}

.detail-block h3 {
    margin-top: 0;
    font-size: 1.2em;
}

.detail-block h4 {
    margin-top: 16px;
}

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

/* ========================================
   Feature Block (within doc-section)
   ======================================== */
.feature-block {
    margin-top: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

.feature-block:last-of-type {
    border-bottom: none;
}

.feature-block h3 {
    margin-top: 0;
    font-size: 1.25em;
}

/* ========================================
   Coming Soon Block
   ======================================== */
.coming-soon-block {
    margin-top: 40px;
    padding: 32px;
    background: var(--color-bg-elevated);
    border-radius: 6px;
    border: 1px dashed var(--color-accent);
}

.alt-bg .coming-soon-block {
    background: var(--color-bg);
}

.coming-soon-block h3 {
    margin-top: 0;
    color: var(--color-accent);
}

.coming-soon-block h4 {
    margin-top: 24px;
}

.coming-soon-block h4:first-of-type {
    margin-top: 16px;
}

.coming-soon-label {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-on-accent);
    font-size: 0.6em;
    padding: 2px 8px;
    border-radius: 3px;
    font-weight: 600;
    vertical-align: middle;
}

/* ========================================
   Code Example
   ======================================== */
.code-example {
    background: var(--color-bg);
    padding: 16px 20px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.88em;
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre-wrap;
    margin: 12px 0;
}

.alt-bg .code-example {
    background: var(--color-bg-elevated);
}

.coming-soon-block .code-example {
    background: var(--color-bg);
}

/* ========================================
   Code Examples Grid (AI Panel)
   ======================================== */
.code-examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin: 16px 0 24px;
}

.code-examples-grid h4 {
    color: var(--color-link);
    font-size: 0.95em;
    margin: 0 0 8px 0;
    font-weight: 600;
}

/* ========================================
   Scenes Section ("こんなとき")
   ======================================== */
.scenes {
    padding: 48px 0;
    background: var(--color-bg-alt);
}

.scenes h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 400;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.scenes h3 {
    font-size: 1.25em;
    color: var(--color-heading);
    margin-top: 28px;
    margin-bottom: 12px;
    font-weight: 500;
}

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 8px;
}

.scene-card {
    background: var(--color-bg);
    border-radius: 6px;
    padding: 24px;
}

.scene-card h3 {
    font-size: 1.1em;
    color: var(--color-heading);
    margin-top: 0;
    margin-bottom: 8px;
}

.scene-card .problem {
    color: var(--color-text-muted);
    font-size: 0.9em;
    margin-bottom: 8px;
}

.scene-card .solution {
    color: var(--color-text);
    font-size: 0.9em;
    line-height: 1.7;
}

/* ========================================
   Natural Language Section
   ======================================== */
.natural-lang {
    padding: 48px 0;
}

.natural-lang h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 12px;
    font-weight: 400;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.natural-lang > .container > p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
    font-size: 1em;
}

.natural-lang td:last-child {
    color: var(--color-accent);
    font-style: italic;
}

.natural-lang td:last-child::before {
    content: "\201C";
}

.natural-lang td:last-child::after {
    content: "\201D";
}

/* ========================================
   Features Grid (3-column cards)
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin: 16px 0;
}

.feature {
    background: var(--color-bg);
    padding: 24px;
    border-radius: 6px;
    text-align: center;
}

.feature-icon {
    font-size: 2.5em;
    margin-bottom: 12px;
}

.feature h3 {
    font-size: 1.2em;
    color: var(--color-heading);
    margin-bottom: 8px;
}

.feature p {
    color: var(--color-text-muted);
    font-size: 0.95em;
    line-height: 1.7;
}

/* ========================================
   Mode Cards (editor modes)
   ======================================== */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 16px 0;
}

.mode-cards .feature {
    padding: 24px;
}

.mode-cards .feature-icon {
    font-size: 2em;
    margin-bottom: 10px;
}

.mode-cards .feature h3 {
    margin-top: 0;
    font-size: 1.1em;
    margin-bottom: 8px;
}

.mode-cards .feature p {
    font-size: 0.9em;
}

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

/* ========================================
   Channels (Get Started / Integrations)
   ======================================== */
.channels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.channel {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.channel h3 {
    font-size: 1.2em;
    color: var(--color-heading);
    margin-bottom: 16px;
}

.channel p {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 12px;
    font-size: 0.95em;
}

.channel .code-example {
    font-size: 0.85em;
}

.channel-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex-grow: 1;
    margin-bottom: 16px;
}

.channel-step {
    color: var(--color-link);
    font-size: 0.9em;
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.channel-step code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
    color: var(--color-text);
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    min-width: 20px;
    background: var(--color-accent);
    color: var(--color-on-accent);
    border-radius: 50%;
    font-size: 0.7em;
    font-weight: bold;
}

.channel-cta {
    display: inline-block;
    text-align: center;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-link);
    font-size: 0.85em;
    transition: all 0.3s;
}

.channel-cta:hover {
    border-color: var(--color-accent);
    color: var(--color-heading);
    text-decoration: none;
}

/* ========================================
   How it Works / Get Started
   ======================================== */
.how-it-works {
    padding: 48px 0;
}

.how-it-works h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 400;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

/* ========================================
   Security Section
   ======================================== */
.security {
    padding: 48px 0;
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.security h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 400;
}

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

.security-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.security-item {
    display: flex;
    align-items: start;
    gap: 12px;
}

.security-item .icon {
    color: var(--color-accent);
    font-size: 1.25em;
    margin-top: 2px;
}

.security-item h4 {
    color: var(--color-heading);
    margin-bottom: 4px;
    font-size: 0.95em;
}

.security-item p {
    color: var(--color-text-muted);
    margin-bottom: 0;
    font-size: 0.9em;
}

.security-code {
    background: var(--color-bg-alt);
    padding: 24px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85em;
    color: var(--color-text);
    overflow-x: auto;
}

.security-code pre {
    margin: 0;
    white-space: pre-wrap;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
    padding: 48px 0;
    background: var(--color-bg-alt);
}

.pricing h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 16px;
    font-weight: 400;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.pricing h3 {
    font-size: 1.25em;
    color: var(--color-heading);
    margin-top: 0;
    margin-bottom: 12px;
    font-weight: 500;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 720px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 32px;
    display: flex;
    flex-direction: column;
}

.pricing-card h3 {
    font-size: 1.5em;
    color: var(--color-heading);
    margin-bottom: 8px;
}

.pricing-card > p {
    color: var(--color-text-muted);
    margin-bottom: 16px;
    font-size: 0.95em;
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    flex-grow: 1;
    margin-bottom: 24px;
}

.pricing-card ul li {
    color: var(--color-text);
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.95em;
}

.pricing-card ul li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

.pricing-card.enterprise {
    border-color: var(--color-accent);
    border-width: 2px;
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
    display: inline-block;
    text-align: center;
    width: 100%;
}

/* ========================================
   Bottom CTA
   ======================================== */
.bottom-cta {
    padding: 48px 0;
}

.bottom-cta h2 {
    font-size: 1.6em;
    color: var(--color-heading);
    margin-bottom: 24px;
    font-weight: 400;
}

/* ========================================
   Footer
   ======================================== */
footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

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

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

footer p {
    color: var(--color-text-dim);
    font-size: 0.85em;
}

/* ========================================
   Smooth scrolling & fixed header offset
   ======================================== */
html {
    scroll-behavior: smooth;
}

section[id] {
    scroll-margin-top: 80px;
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
    text-align: center;
}

.feature-sm {
    padding: 25px;
}

.icon-code {
    font-family: monospace;
    font-size: 2em;
}

.mt-16 {
    margin-top: 16px;
}

.footer-copyright-link {
    color: var(--color-accent);
    text-decoration: none;
}

.detail-block-cta {
    margin-top: 40px;
}

/* ========================================
   Nav Actions (theme toggle + hamburger group)
   ======================================== */
.nav-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* ========================================
   Theme Toggle Button
   ======================================== */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-link);
    font-size: 1.2em;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 0.3s;
}

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

/* ========================================
   Mobile Menu Button (hidden on desktop)
   ======================================== */
.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-link);
    font-size: 1.4em;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 2em;
    }

    .hero .tagline {
        font-size: 1.1em;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .doc-section h2,
    .scenes h2,
    .natural-lang h2,
    .how-it-works h2,
    .pricing h2,
    .security h2,
    .bottom-cta h2 {
        font-size: 1.5em;
    }

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

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

    .security-content {
        grid-template-columns: 1fr;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
    }

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

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

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

    .detail-block {
        padding: 16px;
    }

    .coming-soon-block {
        padding: 20px;
    }

    table {
        display: block;
        overflow-x: auto;
        font-size: 0.85em;
    }

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

    .mode-cards {
        grid-template-columns: 1fr;
    }

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

    .code-examples-grid {
        grid-template-columns: 1fr;
    }

    th, td {
        padding: 8px 10px;
    }

    .breadcrumb {
        font-size: 0.8em;
    }
}

/* ========================================
   Breadcrumb
   ======================================== */
.breadcrumb {
    padding: 12px 0;
    font-size: 0.85em;
    color: var(--color-text-muted);
}

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

.breadcrumb .sep {
    margin: 0 6px;
    color: var(--color-text-dim);
}

/* ========================================
   Related Links (bottom of subpages)
   ======================================== */
/* ========================================
   Page Navigation (prev / next)
   ======================================== */
.page-nav {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
}

.page-nav-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.page-nav-item {
    display: flex;
    flex-direction: column;
}

.page-nav-label {
    font-size: 0.8em;
    color: var(--color-text-dim);
    margin-bottom: 8px;
    display: block;
}

.page-nav-item.next .page-nav-label {
    text-align: right;
}

.page-nav-item a {
    display: flex;
    align-items: center;
    padding: 20px 24px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-heading);
    font-size: 1.05em;
    font-weight: 500;
    transition: all 0.2s;
    flex-grow: 1;
}

.page-nav-item a:hover {
    border-color: var(--color-accent);
    text-decoration: none;
    transform: translateX(-4px);
}

.page-nav-item.next a {
    justify-content: flex-end;
}

.page-nav-item.next a:hover {
    transform: translateX(4px);
}

/* ========================================
   Related Links (bottom of subpages)
   ======================================== */
.related-links {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
}

.related-links h3 {
    color: var(--color-link);
    font-size: 1.1em;
    font-weight: 400;
    margin-bottom: 16px;
}

.related-links-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.related-links-grid a {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-link);
    font-size: 0.9em;
    transition: all 0.3s;
}

.related-links-grid a:hover {
    border-color: var(--color-accent);
    color: var(--color-heading);
    text-decoration: none;
}

/* ========================================
   Nav Active State
   ======================================== */
.nav-links a.active {
    color: var(--color-heading);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
}

.logo.active {
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
}

/* ========================================
   Hub Page — Page Link Cards
   ======================================== */
.page-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.page-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 24px;
    transition: all 0.3s;
    display: block;
    color: var(--color-text);
}

.page-card:hover {
    border-color: var(--color-accent);
    text-decoration: none;
}

.page-card h3 {
    color: var(--color-heading);
    font-size: 1.1em;
    margin-bottom: 8px;
}

.page-card p {
    color: var(--color-text-muted);
    font-size: 0.9em;
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   Noscript fallback
   ======================================== */
noscript nav {
    background: var(--color-bg-alt);
    padding: 16px 24px;
    text-align: center;
}

noscript nav a {
    color: var(--color-accent);
    margin: 0 12px;
}


/* ========================================
   Touch Target Optimization
   ======================================== */
@media (hover: none) and (pointer: coarse) {
    .btn-primary, .btn-secondary, .channel-cta,
    .page-nav-item a, .related-links-grid a, .nav-links a {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}