/* ============================================
   VISR OS — Visual Intelligence System, Reconnaissance
   Halo Infinite–inspired HUD interface theme
   ============================================ */

/* Custom Font */
@font-face {
    font-family: 'Halo';
    src: url('/assets/ttf/Halo.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* ============================================
   VISR OS Design Tokens
   ============================================ */
:root {
    /* VISR Cyan — front-end OS layer ("Windows") */
    --visr-cyan: #00d4ff;
    --visr-cyan-bright: #33e0ff;
    --visr-cyan-dim: #007a99;
    --visr-cyan-5: rgba(0, 212, 255, 0.05);
    --visr-cyan-10: rgba(0, 212, 255, 0.10);
    --visr-cyan-15: rgba(0, 212, 255, 0.15);
    --visr-cyan-25: rgba(0, 212, 255, 0.25);
    --visr-cyan-40: rgba(0, 212, 255, 0.40);

    /* VISR BIOS Green — back-end OS layer ("DOS") */
    --visr-green: #00ff88;
    --visr-green-dim: #00aa5c;
    --visr-green-10: rgba(0, 255, 136, 0.10);
    --visr-green-15: rgba(0, 255, 136, 0.15);

    /* Functional */
    --visr-amber: #ff9500;
    --visr-amber-dim: #cc7700;
    --visr-amber-10: rgba(255, 149, 0, 0.10);
    --visr-red: #ff3b3b;
    --visr-red-dim: #cc2222;
    --visr-red-10: rgba(255, 59, 59, 0.10);

    /* Backgrounds */
    --visr-bg-deep: #030810;
    --visr-bg: #0a1018;
    --visr-bg-alt: #0e1620;
    --visr-surface: #121e2b;
    --visr-surface-hover: #182838;

    /* Borders */
    --visr-border: rgba(0, 212, 255, 0.12);
    --visr-border-bright: rgba(0, 212, 255, 0.30);
    --visr-border-solid: #0d2a3a;

    /* Text */
    --visr-text: #d8e4ee;
    --visr-text-secondary: #7e95a9;
    --visr-text-muted: #4a6070;

    /* Mapped aliases (keeps selectors working) */
    --color-primary: var(--visr-cyan);
    --color-primary-dark: var(--visr-cyan-dim);
    --color-secondary: var(--visr-bg-alt);
    --color-accent: var(--visr-cyan);
    --color-success: var(--visr-green);
    --color-warning: var(--visr-amber);
    --color-error: var(--visr-red);

    --color-bg: var(--visr-bg);
    --color-bg-alt: var(--visr-bg-alt);
    --color-surface: var(--visr-surface);
    --color-surface-hover: var(--visr-surface-hover);
    --color-border: var(--visr-border);
    --color-text: var(--visr-text);
    --color-text-secondary: var(--visr-text-secondary);
    --color-text-muted: var(--visr-text-muted);

    /* TOC Sidebar */
    --toc-width: 280px;
    --toc-bg: var(--visr-bg-deep);
    --toc-text: #ffffff;
    --toc-text-muted: var(--visr-text-secondary);
    --toc-active: var(--visr-cyan);
    --toc-hover: var(--visr-cyan-10);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-title: 'Halo', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    --font-size-hero: 2.5rem;

    /* VISR Corners — angular, not rounded */
    --visr-clip: 8px;
    --border-radius-sm: 1px;
    --border-radius-md: 2px;
    --border-radius-lg: 2px;
    --border-radius-xl: 2px;

    /* Shadows — cyan-tinted */
    --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5), 0 0 1px var(--visr-cyan-15);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 2px var(--visr-cyan-15);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 4px var(--visr-cyan-25);
    --visr-glow: 0 0 12px var(--visr-cyan-25), 0 0 4px var(--visr-cyan-15);
    --visr-glow-strong: 0 0 20px var(--visr-cyan-40), 0 0 8px var(--visr-cyan-25);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index layers */
    --z-toc: 100;
    --z-overlay: 200;
    --z-modal: 300;
    --z-menu-toggle: 150;
    --z-scanlines: 9000;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--spacing-xl);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--visr-text);
    background-color: var(--visr-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* Scanline overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-scanlines);
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 212, 255, 0.015) 2px,
        rgba(0, 212, 255, 0.015) 4px
    );
    mix-blend-mode: screen;
}

/* Subtle hex-grid background pattern on body */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    opacity: 0.025;
    background-image:
        linear-gradient(30deg, var(--visr-cyan) 12%, transparent 12.5%, transparent 87%, var(--visr-cyan) 87.5%, var(--visr-cyan)),
        linear-gradient(150deg, var(--visr-cyan) 12%, transparent 12.5%, transparent 87%, var(--visr-cyan) 87.5%, var(--visr-cyan)),
        linear-gradient(30deg, var(--visr-cyan) 12%, transparent 12.5%, transparent 87%, var(--visr-cyan) 87.5%, var(--visr-cyan)),
        linear-gradient(150deg, var(--visr-cyan) 12%, transparent 12.5%, transparent 87%, var(--visr-cyan) 87.5%, var(--visr-cyan)),
        linear-gradient(60deg, rgba(0, 212, 255, 0.5) 25%, transparent 25.5%, transparent 75%, rgba(0, 212, 255, 0.5) 75%, rgba(0, 212, 255, 0.5)),
        linear-gradient(60deg, rgba(0, 212, 255, 0.5) 25%, transparent 25.5%, transparent 75%, rgba(0, 212, 255, 0.5) 75%, rgba(0, 212, 255, 0.5));
    background-size: 80px 140px;
    background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
}

/* ============================================
   Links — VISR inline data references
   ============================================ */
a {
    color: var(--visr-cyan);
    text-decoration: none;
    border-bottom: 1px solid var(--visr-cyan-25);
    transition: color var(--transition-fast), border-color var(--transition-fast), text-shadow var(--transition-fast);
}

a:hover {
    color: var(--visr-cyan-bright);
    border-bottom-color: var(--visr-cyan);
    text-shadow: 0 0 8px var(--visr-cyan-25);
}

a:active {
    color: var(--visr-text);
}

/* Links that are structural (nav, cards, buttons) shouldn't inherit the underline */
.toc-link,
.toc-home-link,
.toc-report-link,
.toc-changelog-link,
.global-nav-home,
.part-card,
.btn-download,
.btn-download-alt,
.btn-link,
.btn-link-secondary,
.supplier-link,
.popup-scroll a {
    border-bottom: none;
}

/* ============================================
   Layout: Sidebar + Main Content
   ============================================ */
.toc {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--toc-width);
    height: 100vh;
    background: var(--toc-bg);
    color: var(--toc-text);
    display: flex;
    flex-direction: column;
    z-index: var(--z-toc);
    transition: transform var(--transition-normal);
    overflow: hidden;
    border-right: 1px solid var(--visr-border-bright);
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.5), 1px 0 0 var(--visr-border);
}

.content {
    margin-left: var(--toc-width);
    min-height: 100vh;
    padding: var(--spacing-xl);
    max-width: 1000px;
}

@media (max-width: 768px) {
    .toc {
        transform: translateX(-100%);
        width: 85%;
        max-width: 320px;
        padding-top: 48px;
    }

    .toc.active {
        transform: translateX(0);
    }

    .content {
        margin-left: 0;
        padding: var(--spacing-md);
        padding-top: calc(var(--spacing-md) + 48px);
    }
}

/* ============================================
   Global Navigation
   ============================================ */
.global-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 48px;
    background: var(--visr-bg-deep);
    color: var(--toc-text);
    padding: 0 var(--spacing-md);
    padding-left: 56px;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: calc(var(--z-menu-toggle) - 1);
    border-bottom: 1px solid var(--visr-border-bright);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.global-nav-home {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--visr-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    flex-shrink: 0;
}

.global-nav-home:hover {
    color: var(--visr-cyan);
}

.global-nav-icon {
    font-size: var(--font-size-md);
}

.global-nav-separator {
    color: var(--visr-text-muted);
    flex-shrink: 0;
}

.global-nav-current {
    color: var(--visr-cyan);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

@media (max-width: 768px) {
    .global-nav {
        display: flex;
    }

    .is-home .content {
        padding-top: calc(var(--spacing-md) + 60px);
    }
}

/* TOC Home Link */
.toc-home-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--visr-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-xs);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--visr-border);
    transition: color var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.toc-home-link:hover {
    color: var(--visr-cyan);
}

.toc-home-icon {
    font-size: var(--font-size-md);
}

/* ============================================
   Mobile Menu Toggle
   ============================================ */
.menu-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    width: 48px;
    height: 48px;
    background: var(--visr-bg-deep);
    border: 1px solid var(--visr-border-bright);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    z-index: var(--z-menu-toggle);
    padding: 12px;
    box-shadow: var(--visr-glow);
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--visr-cyan);
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--visr-cyan);
    transition: var(--transition-fast);
}

.hamburger::before { top: -7px; }
.hamburger::after { bottom: -7px; }

.menu-toggle.active .hamburger {
    background: transparent;
}

.menu-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.menu-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        top: 0;
        left: 0;
        height: 48px;
        width: 48px;
        border-radius: 0;
        box-shadow: none;
        border: none;
        border-right: 1px solid var(--visr-border);
        border-bottom: 1px solid var(--visr-border);
    }

    .is-home .menu-toggle {
        top: var(--spacing-md);
        left: var(--spacing-md);
        border-radius: var(--border-radius-md);
        box-shadow: var(--visr-glow);
        border: 1px solid var(--visr-border-bright);
    }
}

/* Overlay */
.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(3, 8, 16, 0.75);
    z-index: calc(var(--z-toc) - 1);
    opacity: 0;
    transition: opacity var(--transition-normal);
    backdrop-filter: blur(2px);
}

.overlay.active {
    display: block;
    opacity: 1;
}

/* ============================================
   Table of Contents Sidebar
   ============================================ */
.toc-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--visr-border-bright);
    position: relative;
}

/* Corner accent marks on TOC header */
.toc-header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 20px;
    height: 20px;
    border-top: 2px solid var(--visr-cyan-40);
    border-right: 2px solid var(--visr-cyan-40);
}

.toc-header h2 {
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--visr-text-secondary);
}

.progress-bar {
    height: 4px;
    background: var(--visr-cyan-10);
    border-radius: 0;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
    border: 1px solid var(--visr-border);
}

.progress-fill {
    height: 100%;
    background: var(--visr-cyan);
    width: 0%;
    transition: width var(--transition-normal);
    border-radius: 0;
    box-shadow: 0 0 8px var(--visr-cyan-40);
}

.progress-text {
    font-size: var(--font-size-xs);
    color: var(--visr-cyan-dim);
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
}

.toc-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
    list-style: none;
}

.toc-item {
    margin: 0;
}

.toc-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--visr-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
}

.toc-link:hover {
    background: var(--visr-cyan-10);
    color: var(--visr-text);
    border-left-color: var(--visr-cyan-40);
}

.toc-link.active {
    background: var(--visr-cyan-10);
    color: var(--visr-cyan);
    border-left-color: var(--visr-cyan);
    text-shadow: 0 0 10px var(--visr-cyan-25);
}

.toc-link.completed {
    color: var(--visr-green);
}

.toc-link.completed::before {
    content: '✓';
    font-size: var(--font-size-xs);
    margin-right: var(--spacing-xs);
    text-shadow: 0 0 6px var(--visr-green-15);
}

.toc-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    flex-shrink: 0;
    font-family: var(--font-mono);
}

.toc-link.active .toc-number {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    border-color: var(--visr-cyan);
    box-shadow: 0 0 8px var(--visr-cyan-40);
}

.toc-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--visr-border-bright);
}

.toc-report-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--visr-text-muted);
    text-decoration: none;
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid transparent;
}

.toc-report-link:hover {
    color: var(--visr-amber);
    background: var(--visr-amber-10);
    border-color: rgba(255, 149, 0, 0.2);
}

.toc-changelog-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--visr-text-muted);
    text-decoration: none;
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid transparent;
}

.toc-changelog-link:hover {
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border-color: var(--visr-cyan-25);
}

/* ============================================
   Changelog
   ============================================ */
.changelog-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.changelog-entry {
    position: relative;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--visr-cyan-15);
    border-left: 3px solid var(--visr-cyan-dim);
    border-radius: var(--border-radius-sm);
    background: var(--visr-surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.changelog-entry:hover {
    border-left-color: var(--visr-cyan);
    box-shadow: var(--visr-glow);
}

.changelog-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.changelog-version {
    font-family: var(--font-mono);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--visr-cyan);
}

.changelog-tag {
    display: inline-block;
    padding: 2px 8px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--border-radius-sm);
    border: 1px solid;
}

.changelog-tag--release {
    color: var(--visr-green);
    border-color: var(--visr-green-25);
    background: var(--visr-green-10);
}

.changelog-tag--update {
    color: var(--visr-cyan-bright);
    border-color: var(--visr-cyan-25);
    background: var(--visr-cyan-10);
}

.changelog-tag--fix {
    color: var(--visr-amber);
    border-color: rgba(255, 149, 0, 0.25);
    background: rgba(255, 149, 0, 0.08);
}

.changelog-tag--breaking {
    color: var(--visr-red);
    border-color: rgba(255, 69, 58, 0.25);
    background: rgba(255, 69, 58, 0.08);
}

.changelog-date {
    margin-left: auto;
    font-size: var(--font-size-xs);
    color: var(--visr-text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
}

.changelog-body {
    color: var(--visr-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

.changelog-body p {
    margin-bottom: var(--spacing-xs);
}

.changelog-body ul,
.changelog-body ol {
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
}

.changelog-body li {
    margin-bottom: 4px;
}

/* ============================================
   Home Showcase (3D Model + Slider)
   ============================================ */
.home-showcase {
    margin-bottom: var(--spacing-xl);
}

.showcase-hero {
    position: relative;
    aspect-ratio: 2 / 1;
    background: var(--visr-surface);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--visr-border);
}

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

.showcase-slider {
    background: var(--visr-surface);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--visr-border);
    aspect-ratio: 7 / 5;
}

.home-swiper {
    width: 100%;
    height: 100%;
}

.home-swiper .swiper-slide {
    background: var(--visr-bg);
}

.home-swiper .swiper-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.home-swiper .swiper-button-prev,
.home-swiper .swiper-button-next {
    color: var(--visr-cyan);
    background: rgba(3, 8, 16, 0.6);
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--visr-border);
    transition: all var(--transition-fast);
}

.home-swiper .swiper-button-prev:hover,
.home-swiper .swiper-button-next:hover {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    border-color: var(--visr-cyan);
    box-shadow: var(--visr-glow);
}

.home-swiper .swiper-button-prev::after,
.home-swiper .swiper-button-next::after {
    font-size: 18px;
}

.home-swiper .swiper-pagination-bullet {
    background: var(--visr-cyan-dim);
    opacity: 0.5;
}

.home-swiper .swiper-pagination-bullet-active {
    background: var(--visr-cyan);
    opacity: 1;
    box-shadow: 0 0 6px var(--visr-cyan-40);
}


/* ============================================
   Hero Section
   ============================================ */
.hero {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    background: var(--visr-bg-deep);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    color: white;
    position: relative;
    overflow: hidden;
}

/* Angular corner accents */
.hero::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 1px solid var(--visr-cyan-15);
    pointer-events: none;
}

/* VISR scan line sweep animation across hero */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--visr-cyan-5) 45%,
        var(--visr-cyan-10) 50%,
        var(--visr-cyan-5) 55%,
        transparent 100%
    );
    animation: visr-scan 6s ease-in-out infinite;
    pointer-events: none;
}

.hero h1 {
    font-family: var(--font-title);
    font-size: var(--font-size-hero);
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--visr-cyan);
    text-shadow: 0 0 30px var(--visr-cyan-25), 0 0 60px rgba(0, 212, 255, 0.08);
    position: relative;
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--visr-text-secondary);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: var(--font-size-sm);
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    position: relative;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--visr-text-secondary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--visr-border);
    background: var(--visr-cyan-10);
}

.meta-icon {
    font-size: var(--font-size-md);
    color: var(--visr-cyan);
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: var(--font-size-xxl);
        letter-spacing: 2px;
    }

    .hero-meta {
        gap: var(--spacing-sm);
    }
}

/* ============================================
   Documentation Sections — VISR Panels
   ============================================ */
.doc-section {
    background: var(--visr-surface);
    border-radius: 0;
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 1px solid var(--visr-border);
    position: relative;
}

/* Top-left corner accent */
.doc-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 16px;
    height: 16px;
    border-top: 2px solid var(--visr-cyan-40);
    border-left: 2px solid var(--visr-cyan-40);
    z-index: 1;
    pointer-events: none;
}

/* Bottom-right corner accent */
.doc-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 16px;
    height: 16px;
    border-bottom: 2px solid var(--visr-cyan-40);
    border-right: 2px solid var(--visr-cyan-40);
    z-index: 1;
    pointer-events: none;
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(180deg, var(--visr-bg-alt) 0%, var(--visr-surface) 100%);
    border-bottom: 1px solid var(--visr-border-bright);
    position: relative;
}

/* Decorative line on section headers */
.section-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--visr-cyan);
    box-shadow: 0 0 8px var(--visr-cyan-40);
}

.section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    color: var(--visr-cyan);
    border: 1px solid var(--visr-cyan-40);
    border-radius: 0;
    font-weight: 700;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
    font-family: var(--font-mono);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--visr-text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-content {
    padding: var(--spacing-lg);
}

/* ============================================
   Info Boxes & Callouts — VISR Data Panels
   ============================================ */
.info-box {
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border-bright);
    border-left: 3px solid var(--visr-cyan);
    border-radius: 0;
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.info-box-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--visr-cyan);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: var(--font-size-sm);
}

.info-icon {
    font-size: var(--font-size-lg);
}

.callout {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: 0;
    margin: var(--spacing-md) 0;
    border: 1px solid var(--visr-border);
}

.callout-icon {
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.callout-content strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.callout.warning {
    background: var(--visr-amber-10);
    border-left: 3px solid var(--visr-amber);
    border-color: rgba(255, 149, 0, 0.15);
    border-left-color: var(--visr-amber);
}

.callout.warning .callout-content strong {
    color: var(--visr-amber);
}

.callout.tip {
    background: var(--visr-green-10);
    border-left: 3px solid var(--visr-green);
    border-color: var(--visr-green-15);
    border-left-color: var(--visr-green);
}

.callout.tip .callout-content strong {
    color: var(--visr-green);
}

.callout.success {
    background: var(--visr-green-10);
    border-left: 3px solid var(--visr-green);
    border-color: var(--visr-green-15);
    border-left-color: var(--visr-green);
}

.callout.success .callout-content strong {
    color: var(--visr-green);
}

/* ============================================
   Checklists — Tactical Task Tracking
   ============================================ */
.checklist {
    margin: var(--spacing-md) 0;
}

.checklist h4 {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--visr-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.checkbox-item:hover {
    opacity: 0.8;
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border: 1px solid var(--visr-cyan-40);
    border-radius: 0;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    background: var(--visr-cyan-10);
}

.checkbox-item input:checked + .checkmark {
    background: var(--visr-green);
    border-color: var(--visr-green);
    box-shadow: 0 0 8px var(--visr-green-15);
}

.checkbox-item input:checked + .checkmark::after {
    content: '✓';
    color: var(--visr-bg-deep);
    font-size: var(--font-size-sm);
    font-weight: bold;
}

.checkbox-item input:checked ~ span:last-child {
    text-decoration: line-through;
    opacity: 0.5;
    color: var(--visr-green-dim);
}

.checkbox-item.large {
    padding: var(--spacing-md);
    background: var(--visr-bg-alt);
    border-radius: 0;
    margin-top: var(--spacing-md);
    border: 1px solid var(--visr-border);
}

.checkbox-item.large .checkmark {
    width: 28px;
    height: 28px;
}

/* ============================================
   Parts Grid — VISR Item Cards
   ============================================ */
.parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.part-card {
    background: var(--visr-bg-alt);
    border: 1px solid var(--visr-border);
    border-radius: 0;
    overflow: hidden;
    transition: all var(--transition-fast);
    position: relative;
}

.part-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--visr-glow);
    border-color: var(--visr-border-bright);
}

/* Corner accent on part cards */
.part-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 10px;
    height: 10px;
    border-top: 1px solid var(--visr-cyan-40);
    border-right: 1px solid var(--visr-cyan-40);
    z-index: 1;
    pointer-events: none;
}

.part-card.coming-soon {
    cursor: default;
    opacity: 0.5;
    pointer-events: none;
}

.part-card.coming-soon .part-image {
    position: relative;
}

.coming-soon-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--visr-amber);
    color: var(--visr-bg-deep);
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-family: var(--font-mono);
}

.part-image {
    aspect-ratio: 1;
    background: var(--visr-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--visr-border);
}

.stl-viewer-mini {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-3d {
    width: 60px;
    height: 60px;
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-cyan-40);
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--visr-cyan);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.part-info {
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.part-id {
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    color: var(--visr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.part-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.part-qty {
    font-size: var(--font-size-sm);
    color: var(--visr-cyan);
    font-weight: 600;
    font-family: var(--font-mono);
}

/* Hardware cards */
.part-card.hardware .part-image {
    background: linear-gradient(135deg, var(--visr-bg) 0%, var(--visr-surface) 100%);
}

.hardware-icon {
    font-size: 2.5rem;
}

/* ============================================
   Parts Subsections (Printed / Non-Printed)
   ============================================ */
.parts-subsection {
    margin-bottom: var(--spacing-xl);
}

.parts-subsection:last-child {
    margin-bottom: 0;
}

.subsection-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--visr-border-bright);
}

.subsection-icon {
    font-size: var(--font-size-xl);
    color: var(--visr-cyan);
}

.subsection-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--visr-text);
    flex: 1;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.subsection-count {
    font-size: var(--font-size-xs);
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
    font-family: var(--font-mono);
}

.subsection-desc {
    font-size: var(--font-size-sm);
    color: var(--visr-text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Component Groups */
.component-groups {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.component-group {
    border: 1px solid var(--visr-border);
    border-radius: 0;
    overflow: hidden;
    background: var(--visr-bg-alt);
}

.component-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--visr-surface);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--visr-text);
    text-align: left;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.component-header:hover {
    background: var(--visr-surface-hover);
    color: var(--visr-cyan);
}

.component-icon {
    color: var(--visr-cyan);
}

.component-name {
    flex: 1;
}

.component-count {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
    font-family: var(--font-mono);
}

.component-toggle {
    color: var(--visr-text-muted);
    transition: transform var(--transition-fast);
    transform: rotate(-90deg);
}

.component-header[aria-expanded="false"] .component-toggle {
    transform: rotate(0deg);
}

.component-parts {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--visr-bg);
    overflow: hidden;
    border-top: 1px solid var(--visr-border);
}

.component-header[aria-expanded="false"] + .component-parts {
    display: none;
}

.ungrouped-parts {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--visr-border);
}

.ungrouped-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--visr-border);
}

.ungrouped-header .component-name {
    font-weight: 600;
    color: var(--visr-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ungrouped-header .component-count {
    font-size: var(--font-size-xs);
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
    font-family: var(--font-mono);
}

/* Printed Parts List */
.printed-parts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.printed-part-card {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
    background: var(--visr-bg-alt);
    border: 1px solid var(--visr-border);
    border-radius: 0;
    overflow: hidden;
    transition: all var(--transition-fast);
    position: relative;
}

.printed-part-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 12px;
    height: 12px;
    border-top: 2px solid var(--visr-cyan-40);
    border-left: 2px solid var(--visr-cyan-40);
    z-index: 1;
    pointer-events: none;
}

.printed-part-card:hover {
    box-shadow: var(--visr-glow);
    border-color: var(--visr-border-bright);
}

@media (max-width: 768px) {
    .printed-part-card {
        grid-template-columns: 1fr;
    }
}

.printed-part-viewer {
    background: var(--visr-bg);
    min-height: 0;
    aspect-ratio: 1/1;
    position: relative;
}

/* VISR corner brackets on printed part viewers */
.printed-part-viewer::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid var(--visr-cyan-10);
    pointer-events: none;
    z-index: 2;
}

.printed-part-viewer .stl-viewer {
    height: 100%;
    min-height: 200px;
    aspect-ratio: auto;
    border: none;
    border-radius: 0;
}

.printed-part-info {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.printed-part-info .part-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.printed-part-info .part-id {
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
}

.printed-part-info .part-qty {
    font-size: var(--font-size-md);
    font-weight: 700;
    color: var(--visr-cyan);
    font-family: var(--font-mono);
}

.printed-part-info .part-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--visr-text);
}

.printed-part-info .part-desc {
    font-size: var(--font-size-sm);
    color: var(--visr-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.print-settings {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.print-settings .setting {
    font-size: var(--font-size-xs);
    background: var(--visr-bg);
    border: 1px solid var(--visr-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
    color: var(--visr-text-secondary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.print-settings .setting strong {
    color: var(--visr-text);
}

.print-settings .setting-warning {
    background: var(--visr-amber-10);
    border-color: rgba(255, 149, 0, 0.3);
    color: var(--visr-amber);
}

.print-settings .setting-required {
    border-color: var(--visr-cyan-40);
}

.material-badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-style: normal;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 0;
    margin-left: var(--spacing-xs);
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-mono);
}

.material-badge.required {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
}

.material-badge.recommended {
    background: var(--visr-green);
    color: var(--visr-bg-deep);
}

.print-notes {
    font-size: var(--font-size-sm);
    color: var(--visr-text-muted);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

.part-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    color: var(--visr-cyan);
    text-decoration: none;
    border: 1px solid var(--visr-cyan);
    border-radius: 0;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-download:hover {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: var(--visr-glow);
}

.btn-download-alt {
    background: transparent;
    color: var(--visr-text-secondary);
    border: 1px solid var(--visr-border-bright);
}

.btn-download-alt:hover {
    background: var(--visr-text);
    color: var(--visr-bg-deep);
    border-color: var(--visr-text);
}

/* Part collection checkbox (inline on part cards) */
.part-check {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--visr-border);
}

.part-check span:last-child {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--visr-text-muted);
    font-family: var(--font-mono);
}

.part-check input:checked ~ span:last-child {
    color: var(--visr-green-dim);
}

/* Hardware table checkbox cell */
.part-check-cell {
    width: 36px;
    text-align: center;
}

.part-check-cell .checkbox-item {
    padding: 0;
    justify-content: center;
}

.part-check-cell .checkmark {
    width: 18px;
    height: 18px;
}

/* Dim completed hardware rows */
.hardware-table tbody tr:has(.part-checkbox:checked) {
    opacity: 0.55;
}

.hardware-table tbody tr:has(.part-checkbox:checked):hover {
    opacity: 0.75;
}

/* ============================================
   Model Viewer (GLB)
   ============================================ */
.model-viewer-container {
    background: var(--visr-bg);
    border-radius: 0;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--visr-border-bright);
}

/* VISR HUD corner brackets */
.model-viewer-container::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid var(--visr-cyan-15);
    pointer-events: none;
    z-index: 5;
}

/* Scanline + sweep overlay */
.model-viewer-container::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 3px,
            rgba(0, 212, 255, 0.02) 3px,
            rgba(0, 212, 255, 0.02) 6px
        );
    mix-blend-mode: screen;
    animation: visr-viewer-sweep 5s ease-in-out infinite;
}

@keyframes visr-viewer-sweep {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.model-viewer-container model-viewer {
    --poster-color: transparent;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-height: 400px;
}

.model-viewer-container .viewer-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--visr-text-muted);
    padding: var(--spacing-md);
}

.model-viewer-controls {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
    z-index: 10;
}

.model-viewer-mini {
    width: 100%;
    height: 100%;
    min-height: 80px;
    background: var(--visr-bg);
    border-radius: 0;
    overflow: hidden;
    position: relative;
}

/* Mini viewer corner accents */
.model-viewer-mini::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 8px;
    height: 8px;
    border-top: 1px solid var(--visr-cyan-40);
    border-left: 1px solid var(--visr-cyan-40);
    z-index: 2;
    pointer-events: none;
}

.model-viewer-mini::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 8px;
    height: 8px;
    border-bottom: 1px solid var(--visr-cyan-40);
    border-right: 1px solid var(--visr-cyan-40);
    z-index: 2;
    pointer-events: none;
}

.model-viewer-mini model-viewer {
    --poster-color: transparent;
}

/* ============================================
   Hardware Table — VISR Data Readout
   ============================================ */
.hardware-table-wrapper {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border: 1px solid var(--visr-border);
}

.hardware-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.hardware-table th,
.hardware-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--visr-border);
}

.hardware-table th {
    background: var(--visr-bg-alt);
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--visr-cyan);
    font-family: var(--font-mono);
    border-bottom: 1px solid var(--visr-border-bright);
}

.hardware-table tbody tr {
    transition: background var(--transition-fast);
}

.hardware-table tbody tr:hover {
    background: var(--visr-cyan-10);
}

.hardware-table .part-id-cell {
    font-family: var(--font-mono);
    white-space: nowrap;
    color: var(--visr-cyan);
}

.hardware-table .hardware-icon {
    font-size: var(--font-size-lg);
    margin-right: var(--spacing-xs);
}

.hardware-table .qty-cell {
    font-weight: 700;
    color: var(--visr-cyan);
    font-family: var(--font-mono);
}

.hardware-table .ppu-cell {
    font-family: var(--font-mono);
    white-space: nowrap;
    color: var(--visr-text-muted);
}

.hardware-table .subtotal-cell {
    font-family: var(--font-mono);
    font-weight: 600;
    white-space: nowrap;
    color: var(--visr-text);
}

.hardware-table tfoot {
    border-top: 2px solid var(--visr-cyan-dim);
}

.hardware-total-row .total-label {
    text-align: right;
    font-weight: 700;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--visr-cyan);
    font-family: var(--font-mono);
}

.hardware-total-row .total-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: var(--font-size-base);
    color: var(--visr-cyan-bright);
    white-space: nowrap;
}

.hardware-table .links-cell {
    white-space: nowrap;
}

.hardware-table .text-muted {
    color: var(--visr-text-muted);
}

.supplier-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    text-decoration: none;
    font-size: var(--font-size-xs);
    color: var(--visr-text);
    transition: all var(--transition-fast);
    margin-right: var(--spacing-xs);
}

.supplier-link:hover {
    border-color: var(--visr-cyan);
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: 0 0 8px var(--visr-cyan-25);
}

.supplier-link.mcmaster {
    border-color: #006400;
}

.supplier-link.mcmaster:hover {
    background: #006400;
    border-color: #006400;
    box-shadow: 0 0 8px rgba(0, 100, 0, 0.3);
}

.supplier-link .supplier-logo {
    font-weight: 700;
}

.supplier-link .part-num {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* ============================================
   Non-Standard Parts
   ============================================ */
.nonstandard-parts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nonstandard-part-card {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--spacing-md);
    background: var(--visr-bg-alt);
    border: 1px solid var(--visr-border);
    border-radius: 0;
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
}

.nonstandard-part-card:hover {
    box-shadow: 0 0 8px var(--visr-cyan-15);
    border-color: var(--visr-border-bright);
}

.nonstandard-part-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--visr-bg);
    border-radius: 0;
    aspect-ratio: 1;
    border: 1px solid var(--visr-border);
}

.nonstandard-part-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0;
}

.nonstandard-part-icon .icon-large {
    font-size: 2.5rem;
}

.nonstandard-part-info .part-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.nonstandard-part-info .part-id {
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    color: var(--visr-cyan);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    padding: 2px var(--spacing-xs);
    border-radius: 0;
}

.part-category-badge {
    font-size: var(--font-size-xs);
    background: var(--visr-surface);
    border: 1px solid var(--visr-border);
    padding: 2px var(--spacing-xs);
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-mono);
}

.nonstandard-part-info .part-qty {
    margin-left: auto;
}

.nonstandard-part-info .part-name {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.part-specs {
    font-size: var(--font-size-sm);
    color: var(--visr-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.part-specs .manufacturer {
    font-weight: 500;
}

.part-specs .model-number {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    background: var(--visr-bg);
    border: 1px solid var(--visr-border);
    padding: 2px var(--spacing-xs);
    border-radius: 0;
    margin-left: var(--spacing-xs);
    color: var(--visr-cyan);
}

.part-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    color: var(--visr-cyan);
    border: 1px solid var(--visr-cyan);
    text-decoration: none;
    border-radius: 0;
    font-size: var(--font-size-xs);
    font-weight: 600;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-link:hover {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: 0 0 8px var(--visr-cyan-25);
}

.btn-link-secondary {
    background: transparent;
    color: var(--visr-text-secondary);
    border-color: var(--visr-border-bright);
}

.btn-link-secondary:hover {
    background: var(--visr-surface-hover);
    color: var(--visr-text);
}

.part-image-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@media (max-width: 600px) {
    .nonstandard-part-card {
        grid-template-columns: 1fr;
    }

    .nonstandard-part-icon {
        width: 80px;
        height: 80px;
    }

    .hardware-table {
        font-size: var(--font-size-xs);
    }

    .hardware-table th,
    .hardware-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* ============================================
   Step Instructions
   ============================================ */
.step-instruction {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

@media (max-width: 900px) {
    .step-instruction {
        grid-template-columns: 1fr;
    }
}

.instruction-text {
    order: 1;
}

.instruction-visual {
    order: 2;
    position: sticky;
    top: var(--spacing-lg);
}

@media (max-width: 900px) {
    .instruction-visual {
        order: 1;
        position: relative;
        top: 0;
    }

    .instruction-text {
        order: 2;
    }
}

.numbered-steps {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.numbered-steps li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-sm);
}

.numbered-steps li::marker {
    color: var(--visr-cyan);
    font-weight: 700;
    font-family: var(--font-mono);
}

.substep-image {
    display: block;
    max-width: 100%;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: 4px;
    border: 1px solid var(--visr-border);
}

.parts-needed {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--visr-bg-alt);
    border-radius: 0;
    border: 1px solid var(--visr-border);
    border-left: 3px solid var(--visr-cyan-40);
}

.parts-needed h4 {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--visr-cyan);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
}

.parts-mini-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.part-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--visr-cyan-10);
    border: 1px solid var(--visr-border);
    border-radius: 0;
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    color: var(--visr-cyan);
}

/* ============================================
   STL Viewer — VISR Viewport
   ============================================ */
.stl-viewer {
    background: var(--visr-bg);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    aspect-ratio: 4/3;
    position: relative;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

/* VISR HUD bracket overlay on STL viewers */
.stl-viewer::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid var(--visr-cyan-15);
    pointer-events: none;
    z-index: 5;
}

.stl-viewer:hover {
    border-color: var(--visr-cyan-40);
    box-shadow: inset 0 0 30px rgba(0, 212, 255, 0.03);
}

.stl-viewer.dragover {
    border-color: var(--visr-green);
    background: var(--visr-green-10);
    box-shadow: inset 0 0 20px var(--visr-green-10);
}

.stl-viewer.has-model {
    border-style: solid;
    border-color: var(--visr-border-bright);
}

.viewer-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--visr-text-muted);
    padding: var(--spacing-md);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.6;
}

.viewer-placeholder p {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: var(--font-size-sm);
}

.viewer-placeholder small {
    font-size: var(--font-size-xs);
}

.viewer-controls {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.stl-viewer:hover .viewer-controls,
.stl-viewer.has-model .viewer-controls {
    opacity: 1;
}

.viewer-btn {
    width: 36px;
    height: 36px;
    background: var(--visr-surface);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    cursor: pointer;
    font-size: var(--font-size-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--visr-text);
}

.viewer-btn:hover {
    background: var(--visr-cyan);
    border-color: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: var(--visr-glow);
}

.step-complete {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--visr-border);
}

/* ============================================
   Accordion (Troubleshooting) — VISR Panels
   ============================================ */
.accordion {
    border: 1px solid var(--visr-border);
    border-radius: 0;
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--visr-border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--visr-bg-alt);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--visr-text);
    text-align: left;
    transition: all var(--transition-fast);
}

.accordion-header:hover {
    background: var(--visr-surface-hover);
    color: var(--visr-cyan);
}

.accordion-icon {
    font-size: var(--font-size-xl);
    font-weight: 300;
    color: var(--visr-cyan);
    transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-icon {
    transform: rotate(45deg);
}

.accordion-item.active .accordion-header {
    border-bottom: 1px solid var(--visr-border);
    background: var(--visr-surface);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.accordion-item.active .accordion-content {
    max-height: 500px;
}

.accordion-content p {
    padding: var(--spacing-md);
    color: var(--visr-text-secondary);
}

/* ============================================
   Completion Section — Pending state (default)
   ============================================ */
.completion-section {
    background: var(--visr-bg-deep);
    color: var(--visr-text-muted);
    border-color: var(--visr-border);
    opacity: 0.6;
    transition: opacity var(--transition-slow), border-color var(--transition-slow);
}

.completion-section .section-header h2 {
    color: var(--visr-text-muted);
}

.completion-section .section-number {
    background: transparent;
    color: var(--visr-text-muted);
    border-color: var(--visr-border);
}

.completion-message {
    text-align: center;
    padding: var(--spacing-xl);
}

.completion-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.4;
    transition: opacity var(--transition-slow);
}

.completion-message h3 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-sm);
    color: var(--visr-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: color var(--transition-slow), text-shadow var(--transition-slow);
}

.completion-message p {
    color: var(--visr-text-muted);
}

.completion-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    border: 1px solid var(--visr-border);
    background: var(--visr-cyan-10);
    min-width: 100px;
    transition: border-color var(--transition-slow), background var(--transition-slow);
}

.stat-value {
    display: block;
    font-size: var(--font-size-hero);
    font-weight: 800;
    color: var(--visr-cyan);
    font-family: var(--font-mono);
    transition: color var(--transition-slow), text-shadow var(--transition-slow);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--visr-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-family: var(--font-mono);
}

.btn-primary {
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    color: var(--visr-text-muted);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

/* ============================================
   Completion Section — Active / Guide Complete
   ============================================ */
.completion-section.guide-complete {
    opacity: 1;
    border-color: var(--visr-green-15);
}

.completion-section.guide-complete::before {
    border-color: var(--visr-green-15);
}

.completion-section.guide-complete::after {
    border-color: var(--visr-green-15);
}

.completion-section.guide-complete .section-header {
    background: var(--visr-green-10);
    border-bottom-color: var(--visr-green-15);
}

.completion-section.guide-complete .section-header::after {
    background: var(--visr-green);
    box-shadow: 0 0 8px rgba(0, 255, 136, 0.4);
}

.completion-section.guide-complete .section-header h2 {
    color: var(--visr-green);
}

.completion-section.guide-complete .section-number {
    color: var(--visr-green);
    border-color: rgba(0, 255, 136, 0.4);
}

.completion-section.guide-complete .completion-icon {
    opacity: 1;
}

.completion-section.guide-complete .completion-message h3 {
    color: var(--visr-green);
    text-shadow: 0 0 20px var(--visr-green-15);
}

.completion-section.guide-complete .completion-message p {
    color: var(--visr-text-secondary);
}

.completion-section.guide-complete .stat {
    border-color: var(--visr-green-15);
    background: var(--visr-green-10);
}

.completion-section.guide-complete .stat-value {
    color: var(--visr-green);
    text-shadow: 0 0 15px var(--visr-green-15);
}

.completion-section.guide-complete .btn-primary {
    color: var(--visr-green);
    border-color: var(--visr-green);
}

.completion-section.guide-complete .btn-primary:hover {
    background: var(--visr-green);
    color: var(--visr-bg-deep);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    transform: translateY(-2px);
}

/* ============================================
   Footer
   ============================================ */
.main-footer {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--visr-text-muted);
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-top: 1px solid var(--visr-border);
}

/* ============================================
   Modal — VISR Full Viewport
   ============================================ */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(3, 8, 16, 0.95);
    z-index: var(--z-modal);
    padding: var(--spacing-lg);
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--visr-surface);
    border-radius: 0;
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--visr-border-bright);
    box-shadow: var(--visr-glow-strong);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: var(--visr-bg);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    font-size: var(--font-size-xl);
    cursor: pointer;
    z-index: 1;
    color: var(--visr-text);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--visr-red);
    border-color: var(--visr-red);
    color: white;
    box-shadow: 0 0 12px var(--visr-red-10);
}

.modal-viewer {
    aspect-ratio: 16/9;
    background: var(--visr-bg);
}

.modal-viewer canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.modal-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--visr-bg-alt);
    border-top: 1px solid var(--visr-border);
}

.modal-controls .viewer-btn {
    width: auto;
    padding: var(--spacing-sm) var(--spacing-md);
}

.modal-info {
    text-align: center;
    padding: var(--spacing-sm);
    color: var(--visr-text-muted);
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
}

/* ============================================
   SVG Icons
   ============================================ */
.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

.icon svg {
    display: block;
    flex-shrink: 0;
}

.placeholder-icon .icon svg {
    opacity: 0.5;
}

.guide-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   Utility Classes
   ============================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Issue Report Form — VISR Terminal Input
   ============================================ */
.issue-form {
    margin-top: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--visr-cyan);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-family: var(--font-mono);
}

.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--visr-bg);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    color: var(--visr-text);
    font-family: var(--font-mono);
    font-size: var(--font-size-md);
    line-height: 1.6;
    resize: vertical;
    transition: all var(--transition-fast);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--visr-cyan);
    box-shadow: inset 0 0 12px var(--visr-cyan-10), 0 0 8px var(--visr-cyan-15);
}

.form-textarea::placeholder {
    color: var(--visr-text-muted);
}

.form-submit {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-xl);
    background: transparent;
    color: var(--visr-cyan);
    border: 1px solid var(--visr-cyan);
    border-radius: 0;
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-submit:hover {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: var(--visr-glow);
    transform: translateY(-1px);
}

.form-submit:active {
    transform: translateY(0);
}

/* ============================================
   Popup / Disclaimer — VISR Alert Panel
   ============================================ */
.popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(3, 8, 16, 0.92);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    backdrop-filter: blur(6px);
}

.popup-overlay.dismissed {
    display: none;
}

.popup-container {
    background: var(--visr-bg-alt);
    border: 1px solid var(--visr-border-bright);
    border-radius: 0;
    width: 100%;
    max-width: 640px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--visr-glow-strong);
    overflow: hidden;
    position: relative;
}

/* Corner accents on popup */
.popup-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 24px;
    height: 24px;
    border-top: 2px solid var(--visr-cyan);
    border-left: 2px solid var(--visr-cyan);
    z-index: 1;
    pointer-events: none;
}

.popup-container::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 24px;
    height: 24px;
    border-bottom: 2px solid var(--visr-cyan);
    border-right: 2px solid var(--visr-cyan);
    z-index: 1;
    pointer-events: none;
}

.popup-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--visr-border-bright);
    flex-shrink: 0;
    background: var(--visr-cyan-10);
}

.popup-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--visr-cyan);
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.popup-scroll {
    padding: var(--spacing-lg) var(--spacing-xl);
    overflow-y: auto;
    flex: 1;
    color: var(--visr-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

.popup-scroll h1,
.popup-scroll h2,
.popup-scroll h3,
.popup-scroll h4 {
    color: var(--visr-text);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.popup-scroll h1:first-child,
.popup-scroll h2:first-child,
.popup-scroll h3:first-child {
    margin-top: 0;
}

.popup-scroll p {
    margin-bottom: var(--spacing-md);
}

.popup-scroll ul,
.popup-scroll ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.popup-scroll li {
    margin-bottom: var(--spacing-xs);
}

.popup-scroll a {
    border-bottom: 1px solid var(--visr-border-bright);
}

.popup-scroll a:hover {
    border-bottom-color: var(--visr-cyan);
}

.popup-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--visr-border-bright);
    flex-shrink: 0;
    display: flex;
    justify-content: center;
}

.popup-agree {
    padding: var(--spacing-sm) var(--spacing-xxl);
    background: transparent;
    color: var(--visr-cyan);
    border: 1px solid var(--visr-cyan);
    border-radius: 0;
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.popup-agree:hover {
    background: var(--visr-cyan);
    color: var(--visr-bg-deep);
    box-shadow: var(--visr-glow);
    transform: translateY(-1px);
}

.popup-agree:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    .popup-container {
        max-height: 90vh;
    }

    .popup-header,
    .popup-scroll,
    .popup-footer {
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .toc,
    .menu-toggle,
    .viewer-controls,
    .modal,
    .overlay,
    .global-nav,
    .popup-overlay {
        display: none !important;
    }

    body::before,
    body::after {
        display: none !important;
    }

    .content {
        margin-left: 0;
        max-width: 100%;
    }

    .doc-section {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .stl-viewer {
        border-style: solid;
    }

    .hero {
        background: #0a1018 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}

/* ============================================
   VISR OS Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes visr-scan {
    0% { left: -100%; }
    40% { left: 100%; }
    100% { left: 100%; }
}

@keyframes visr-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes visr-border-glow {
    0%, 100% { border-color: var(--visr-cyan-40); }
    50% { border-color: var(--visr-cyan); }
}

@keyframes visr-flicker {
    0%, 100% { opacity: 1; }
    92% { opacity: 1; }
    93% { opacity: 0.8; }
    94% { opacity: 1; }
    96% { opacity: 0.9; }
    97% { opacity: 1; }
}

.doc-section {
    opacity: 0;
    animation: fadeIn 0.4s ease forwards, visr-flicker 8s ease-in-out infinite;
}

.doc-section:nth-child(1) { animation-delay: 0.05s; }
.doc-section:nth-child(2) { animation-delay: 0.10s; }
.doc-section:nth-child(3) { animation-delay: 0.15s; }
.doc-section:nth-child(4) { animation-delay: 0.20s; }
.doc-section:nth-child(5) { animation-delay: 0.25s; }

/* Active TOC number pulsing */
.toc-link.active .toc-number {
    animation: visr-pulse 2s ease-in-out infinite;
}

/* Progress bar glow pulse */
.progress-fill {
    animation: visr-pulse 3s ease-in-out infinite;
}

/* Hero title subtle flicker */
.hero h1 {
    animation: visr-flicker 10s ease-in-out infinite;
}

/* ============================================
   Scrollbar — VISR styled
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--visr-bg-deep);
}

::-webkit-scrollbar-thumb {
    background: var(--visr-cyan-25);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--visr-cyan-40);
}

/* ============================================
   Focus Styles for Accessibility
   ============================================ */
:focus-visible {
    outline: 1px solid var(--visr-cyan);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px var(--visr-cyan-15);
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 1px solid var(--visr-cyan);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px var(--visr-cyan-15);
}

/* ============================================
   Selection highlight — VISR cyan
   ============================================ */
::selection {
    background: var(--visr-cyan-40);
    color: white;
}

::-moz-selection {
    background: var(--visr-cyan-40);
    color: white;
}