/* ===========================================
   Stripe Press-Style Scroll Effects
   For H100 Blog Redesign
   =========================================== */

/* CSS Variable Extensions */
:root {
    /* Stripe Press spacing */
    --space-section: clamp(80px, 15vh, 160px);
    --space-chapter: clamp(60px, 10vh, 120px);
    --content-width: min(720px, 90vw);
    --wide-content: min(1000px, 95vw);

    /* Animation timing - snappy */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --duration-normal: 0.35s;
    --duration-slow: 0.5s;

    /* Chapter styling */
    --chapter-number-color: rgba(255, 107, 0, 0.12);
    --pull-quote-border: #ff6b00;
    --accent-gradient: linear-gradient(90deg, #ff6b00, #ff8533);
}

[data-theme="dark"] {
    --chapter-number-color: rgba(255, 107, 0, 0.2);
}

/* ===========================================
   Smooth Scroll Classes (Lenis)
   =========================================== */
html.lenis, html.lenis body {
    height: auto;
}

.lenis.lenis-smooth {
    scroll-behavior: auto !important;
}

.lenis.lenis-smooth [data-lenis-prevent] {
    overscroll-behavior: contain;
}

.lenis.lenis-stopped {
    overflow: hidden;
}

/* ===========================================
   Reading Progress Bar
   =========================================== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--border-secondary, #333);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.reading-progress.visible {
    opacity: 1;
}

.reading-progress-bar {
    height: 100%;
    background: var(--accent-gradient);
    width: 0%;
    will-change: width;
    transition: none; /* Instant updates */
}

/* ===========================================
   Two-Column Layout
   =========================================== */
.two-column-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

/* ===========================================
   Left Sidebar TOC
   =========================================== */
.sidebar-toc {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    padding: 80px 24px 40px 28px;
    overflow-y: auto;
    background: transparent;
    z-index: 50;
}

.sidebar-toc::-webkit-scrollbar {
    width: 4px;
}

.sidebar-toc::-webkit-scrollbar-thumb {
    background: var(--border-secondary, #333);
    border-radius: 2px;
}

.toc-section {
    margin-bottom: 36px;
}

.toc-section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted, #666);
    margin-bottom: 16px;
}

.toc-section-number {
    color: #ff6b00;
    margin-right: 6px;
}

.toc-items {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-items li {
    margin: 12px 0;
    position: relative;
    padding-left: 16px;
}

.toc-items li::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: var(--text-muted, #555);
    font-size: 0.75em;
}

.toc-items a {
    font-size: 0.85rem;
    color: var(--text-secondary, #999);
    text-decoration: none;
    transition: color 0.15s ease;
    line-height: 1.6;
}

.toc-items a:hover {
    color: var(--text-color, #fff);
}

.toc-items a.active {
    color: #ff6b00;
}

/* ===========================================
   Right Scroll Markers
   =========================================== */
.scroll-markers {
    position: fixed;
    right: 16px;
    top: 60px;
    bottom: 60px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 100;
}

.scroll-marker {
    width: 24px;
    height: 2px;
    background: var(--border-secondary, #444);
    transition: background 0.15s ease, width 0.15s ease;
}

.scroll-marker.active {
    background: #ff6b00;
    width: 32px;
}

/* ===========================================
   Main Content Area
   =========================================== */
.main-content {
    margin-left: 280px;
    margin-right: 60px;
    padding: 60px 80px 100px;
    max-width: 840px;
}

/* Mobile: hide sidebar, full width content */
@media (max-width: 1024px) {
    .two-column-layout {
        grid-template-columns: 1fr;
    }

    .sidebar-toc {
        display: none;
    }

    .scroll-markers {
        display: none;
    }

    .main-content {
        margin-left: 0;
        margin-right: 0;
        padding: 40px 24px;
        max-width: 100%;
    }
}

/* Hide old chapter-nav */
.chapter-nav {
    display: none;
}

/* ===========================================
   Hero Section (Content Header)
   =========================================== */
.hero-section {
    padding: 40px 0 60px;
    text-align: center;
    position: relative;
    margin-bottom: 40px;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-meta {
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    color: var(--text-muted, #777);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 400;
    margin: 0 0 28px;
    line-height: 1.15;
    letter-spacing: 0.02em;
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary, #999);
    margin: 0 0 40px;
    line-height: 1.7;
    max-width: 620px;
    margin-left: auto;
    margin-right: auto;
}

.divider-line {
    color: var(--text-muted, #555);
    letter-spacing: 0.4em;
    font-size: 0.85rem;
}

/* Meta divider */
.meta-divider {
    opacity: 0.5;
    margin: 0 8px;
}

/* ===========================================
   Article Container
   =========================================== */
.article-container {
    position: relative;
    z-index: 2;
}

/* ===========================================
   Chapter Styling
   =========================================== */
.chapter {
    padding: 20px 0;
    position: relative;
}

.chapter-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-color, #fff);
    margin: 0 0 32px;
    letter-spacing: 0.01em;
    opacity: 0;
    transform: translateY(10px);
}

.chapter-title.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s var(--ease-out-expo),
                transform 0.3s var(--ease-out-expo);
}

.chapter-content {
    /* Content is already constrained by main-content */
}

.chapter-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 48px 0 24px;
    color: var(--text-color, #fff);
}

/* ===========================================
   Content Blocks with Fade-in
   =========================================== */
.content-block {
    margin-bottom: 2rem;
}

.content-block p {
    line-height: 1.85;
    color: var(--text-secondary, #bbb);
    text-align: justify;
    hyphens: auto;
    font-size: 1rem;
}

.content-block ul {
    margin: 24px 0;
    padding-left: 28px;
}

.content-block li {
    line-height: 1.75;
    color: var(--text-secondary, #bbb);
    margin: 12px 0;
    font-size: 1rem;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
}

.fade-in-up.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s var(--ease-out-expo),
                transform 0.3s var(--ease-out-expo);
}

/* Stagger delays for sequential reveals */
.stagger-1 { transition-delay: 0s; }
.stagger-2 { transition-delay: 0.05s; }
.stagger-3 { transition-delay: 0.1s; }
.stagger-4 { transition-delay: 0.15s; }
.stagger-5 { transition-delay: 0.2s; }

/* ===========================================
   Pull Quotes (Stripe Press Style)
   =========================================== */
.pull-quote {
    margin: 2.75rem 0;
    padding: 0;
    padding-left: 1.75rem;
    border-left: 4px solid #ff6b00;
    background: transparent;
    font-size: 1rem;
    font-style: italic;
    color: var(--text-color, #fff);
    position: relative;
    opacity: 0;
    transform: translateX(-10px);
}

.pull-quote.revealed {
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.3s var(--ease-out-expo),
                transform 0.3s var(--ease-out-expo);
}

.pull-quote p {
    margin: 0;
    line-height: 1.75;
    text-align: left;
}

/* ===========================================
   Data Tables (Stripe Press Style)
   =========================================== */
.data-table-container {
    overflow-x: auto;
    margin: 2.75rem 0 3.25rem;
    opacity: 0;
    transform: translateY(15px);
    -webkit-overflow-scrolling: touch;
}

.data-table-container.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s var(--ease-out-expo),
                transform 0.3s var(--ease-out-expo);
}

.stripe-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    min-width: 600px;
}

.stripe-table th {
    background: rgba(255, 107, 0, 0.08);
    color: #ff6b00;
    text-align: left;
    padding: 14px 18px;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    border-bottom: 1px solid rgba(255, 107, 0, 0.2);
}

.stripe-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-secondary, #333);
    color: var(--text-secondary, #bbb);
    vertical-align: top;
    font-size: 0.9rem;
}

.stripe-table tr:hover td {
    background: rgba(255, 107, 0, 0.02);
}

.stripe-table tbody tr:last-child td {
    border-bottom: none;
}

/* Table scroll hint */
.table-scroll-hint {
    display: none;
    font-size: 0.7rem;
    color: var(--text-muted, #888);
    margin-top: 0.5rem;
    text-align: center;
}

@media (max-width: 768px) {
    .table-scroll-hint {
        display: block;
    }
}

/* ===========================================
   Mermaid Diagram Container
   =========================================== */
.mermaid-container {
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(255, 107, 0, 0.03);
    border-radius: 8px;
    border: 1px solid rgba(255, 107, 0, 0.1);
    overflow-x: auto;
    opacity: 0;
    transform: scale(0.98);
}

.mermaid-container.revealed {
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.35s var(--ease-out-expo),
                transform 0.35s var(--ease-out-expo);
}

.mermaid-container svg {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

/* ===========================================
   Supply Chain Flow (Visual Steps)
   =========================================== */
.supply-chain-section {
    padding: var(--space-section) 0;
    max-width: var(--wide-content);
    margin: 0 auto;
}

.flow-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 3rem;
    color: var(--text-color, #fff);
}

.supply-chain-flow {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 1.5rem;
    margin: 2rem 0;
}

.flow-step {
    text-align: center;
    flex: 0 0 100px;
    opacity: 0;
    transform: translateY(10px);
}

.flow-step.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.25s var(--ease-out-expo),
                transform 0.25s var(--ease-out-expo);
}

.step-number {
    width: 36px;
    height: 36px;
    margin: 0 auto 0.75rem;
    border: 1px solid #ff6b00;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: #ff6b00;
}

.flow-step h4 {
    margin: 0 0 0.35rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color, #fff);
}

.flow-step p {
    margin: 0;
    font-size: 0.75rem;
    color: var(--text-muted, #888);
    line-height: 1.4;
}

/* ===========================================
   Process Steps (Manufacturing)
   =========================================== */
.process-steps {
    margin: 1.5rem 0;
}

.process-step {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
    opacity: 0;
    transform: translateX(-8px);
}

.process-step.revealed {
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.2s var(--ease-out-expo),
                transform 0.2s var(--ease-out-expo);
}

.step-indicator {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border: 1px solid #ff6b00;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: #ff6b00;
}

.step-content h4 {
    margin: 0 0 0.35rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color, #fff);
}

.step-content p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary, #ccc);
    line-height: 1.55;
}

/* ===========================================
   Links
   =========================================== */
.chapter-content a {
    color: #ff6b00;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 107, 0, 0.3);
    transition: border-color 0.2s ease;
}

.chapter-content a:hover {
    border-bottom-color: #ff6b00;
}

/* ===========================================
   Code Blocks (if any remain)
   =========================================== */
.chapter-content pre {
    background: var(--pre-bg, #1a1a1a);
    border-radius: 6px;
    padding: 1.25rem;
    overflow-x: auto;
    font-size: 0.85rem;
    margin: 1.5rem 0;
}

.chapter-content code {
    font-family: 'CommitMono', monospace;
}

/* ===========================================
   Section Divider
   =========================================== */
.section-divider {
    text-align: center;
    padding: 60px 0;
    color: var(--text-muted, #555);
    letter-spacing: 0.4em;
    font-size: 0.8rem;
}

/* Closing text */
.closing-text {
    text-align: center;
    padding: 80px 0 120px;
    font-style: italic;
}

/* ===========================================
   Mobile Responsiveness
   =========================================== */
@media (max-width: 768px) {
    :root {
        --space-section: 60px;
        --space-chapter: 40px;
    }

    .hero-section {
        min-height: 85vh;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .pull-quote {
        padding: 1.5rem;
        padding-left: 1.5rem;
        font-size: 1rem;
        margin: 2rem 0;
    }

    .pull-quote::before {
        display: none;
    }

    .chapter-content {
        padding: 0 1.25rem;
    }

    .chapter-header {
        padding: 0 1.25rem;
    }

    .supply-chain-flow {
        gap: 1.5rem;
        padding: 0 1rem;
    }

    .flow-step {
        flex: 0 0 100px;
    }

    .process-step {
        gap: 1rem;
    }

    .step-indicator {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
}

/* ===========================================
   Reduced Motion
   =========================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .lenis.lenis-smooth {
        scroll-behavior: auto;
    }

    .fade-in-up,
    .pull-quote,
    .chapter-title,
    .data-table-container,
    .mermaid-container,
    .flow-step,
    .process-step {
        opacity: 1;
        transform: none;
    }
}

/* ===========================================
   Print Styles
   =========================================== */
@media print {
    .reading-progress,
    .chapter-nav,
    .scroll-indicator,
    .hero-parallax {
        display: none !important;
    }

    .fade-in-up,
    .pull-quote,
    .chapter-title,
    .data-table-container {
        opacity: 1 !important;
        transform: none !important;
    }
}