/* ============================================
   OUT OF ARCHITECTURE - MAIN STYLESHEET
   Dark-themed website showcasing alternate 
   career paths for architects.
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   Defines the color palette and common values.
   ============================================ */
:root {
    /* Primary Colors - Dark Theme */
    --color-bg-primary: #000000;        /* Pure black - main background */
    --color-bg-secondary: #141414;       /* Slightly lighter - sections */
    --color-bg-card: #1a1a1a;            /* Card backgrounds */
    --color-bg-card-hover: #242424;      /* Card hover state */
    
    /* Text Colors */
    --color-text-primary: #ffffff;       /* White - main text */
    --color-text-secondary: #888888;     /* Gray - secondary text */
    --color-text-muted: #555555;         /* Muted text */
    
    /* Accent Color - Warm gold/bronze */
    --color-accent: #c9a87c;             /* Warm accent */
    --color-accent-hover: #d4b88a;       /* Lighter on hover */
    --color-accent-dim: rgba(201, 168, 124, 0.3); /* Dimmed accent */
    
    /* Borders and Lines */
    --color-border: #2a2a2a;             /* Subtle borders */
    --color-border-light: #3a3a3a;       /* Lighter borders */
    
    /* Typography - Clean monospace fonts */
    --font-display: 'Bebas Neue', 'Impact', sans-serif;  /* Bold display font */
    --font-body: 'Roboto Mono', 'Courier New', monospace;  /* Monospace body font */
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    
    /* Layout */
    --navbar-height: 200px;              /* Collapsed navbar height */
    --container-max-width: 1400px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-modal: 0 10px 50px rgba(0, 0, 0, 0.8);
}

/* ============================================
   CSS RESET & BASE STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Remove default link styles */
a {
    color: inherit;
    text-decoration: none;
}

/* Remove default button styles */
button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    color: inherit;
}

/* Remove default list styles */
ul, ol {
    list-style: none;
}

/* Make images responsive */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   HERO SECTION - FIXED MORPHING HEADER
   Fixed at top, morphs from full hero to
   compact navbar on scroll. Uses transforms
   for smooth animation without layout shifts.
   ============================================ */
.hero {
    /* Fixed positioning - always at top */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    
    /* Pure black background */
    background: #000000;
    
    /* Flexbox centering */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    
    /* Will be set by JS - starts at 100vh */
    height: 100vh;
    
    /* Bottom border (visible when collapsed) */
    border-bottom: 2px solid transparent;
    
    /* Border transition only - height is controlled directly by JS without transition
       to avoid wobble/jitter from CSS fighting with JS updates */
    transition: border-color 0.3s ease;
    
    /* Prevent content overflow during shrink */
    overflow: hidden;
}

/* Add border when hero is in collapsed state */
.hero.is-collapsed {
    border-bottom-color: #2a2a2a;
}

/* Spacer element - pushes content below fixed hero */
.hero-spacer {
    height: 100vh;
    pointer-events: none;
}

/* ============================================
   HERO - STATIC NAVBAR STATE
   For pages that should skip the hero animation
   and start directly in navbar/collapsed state.
   ============================================ */
.hero--static-navbar {
    height: var(--navbar-height) !important;
    border-bottom-color: #2a2a2a;
}

.hero--static-navbar .hero__content {
    flex-direction: row;
    justify-content: center;
}

.hero--static-navbar .hero__logo-img {
    height: 160px !important;
}

.hero--static-navbar .hero__nav {
    opacity: 1;
    pointer-events: auto;
}

.hero--static-navbar .hero__scroll-indicator {
    display: none;
}

/* Hero content container */
.hero__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    width: 100%;
    max-width: var(--container-max-width);
    padding: 0 var(--spacing-xl);
    position: relative;
}

/* When collapsed, switch to horizontal layout */
.hero.is-collapsed .hero__content {
    flex-direction: row;
    justify-content: center;
}

/* ============================================
   HERO LOGO
   Large initially, shrinks to navbar size.
   Height controlled directly by JS.
   ============================================ */
.hero__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.hero__logo-img {
    /* Height set directly by JS for performance */
    /* Starting at 400px (smaller than before for smoother shrink) */
    height: 400px;
    width: auto;
    max-width: 90vw;
    object-fit: contain;
    
    /* Smooth transition for hover effect only - no transition on height
       to prevent wobble when JS updates the value */
    transition: transform 0.3s ease;
    
    /* Force GPU acceleration for smoother rendering */
    transform: translateZ(0);
    backface-visibility: hidden;
    
    /* Prevent layout shift during animation */
    will-change: height, transform;
}

.hero__logo-img:hover {
    transform: scale(1.02);
}

/* ============================================
   HERO NAVIGATION
   Hidden initially, fades in as hero collapses.
   Positioned on the right in navbar state.
   ============================================ */
.hero__nav {
    /* Initially hidden */
    opacity: 0;
    
    /* Layout */
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    
    /* Positioned on the right */
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    
    /* Prevent interaction when invisible */
    pointer-events: none;
    
    /* Performance optimization */
    will-change: opacity;
}

/* Enable interaction when visible */
.hero.is-collapsed .hero__nav {
    pointer-events: auto;
}

/* Navigation link styling */
.hero__nav-link {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    color: #888888;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.hero__nav-link:hover {
    color: var(--color-text-primary);
}

/* Active state - current page */
.hero__nav-link--active {
    color: #e8e8e8;
    border-bottom-color: #e8e8e8;
}

/* ============================================
   SCROLL INDICATOR
   Fades out as user scrolls.
   ============================================ */
.hero__scroll-indicator {
    /* Positioning at bottom of hero */
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    
    /* Layout */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    
    /* Styling */
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    
    /* Entrance animation */
    animation: fadeIn 1s ease-out 0.5s both;
    
    /* Prevent interaction when faded */
    pointer-events: none;
    
    /* Performance optimization */
    will-change: opacity;
}

/* Hide scroll indicator when hero is collapsed */
.hero.is-collapsed .hero__scroll-indicator {
    display: none;
}

.hero__scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 3px solid #e8e8e8;
    border-bottom: 3px solid #e8e8e8;
    transform: rotate(45deg);
    animation: bounceDown 2s infinite;
}

/* ============================================
   BODY COLOR SCHEME
   Body stays black, grid section is grey.
   ============================================ */

/* ============================================
   GRID SECTION - MAIN CONTENT
   Contains the category columns.
   ============================================ */
.grid-section {
    min-height: 100vh;
    /* Add top padding to account for fixed navbar height */
    /* navbar-height (200px) + extra spacing */
    padding: calc(var(--navbar-height) + var(--spacing-lg)) var(--spacing-lg) var(--spacing-xxl);
    
    /* Grey background - revealed as hero shrinks */
    background-color: #e8e8e8;
    
    /* Subtle pattern overlay on grey */
    background-image: 
        linear-gradient(rgba(201, 168, 124, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201, 168, 124, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    
    /* Light theme colors for grid section */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #555555;
    --color-text-muted: #888888;
    --color-border: #cccccc;
    --color-border-light: #dddddd;
    --color-bg-card: #f0f0f0;
    --color-bg-card-hover: #e0e0e0;
}

/* Grid container for categories */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: var(--spacing-md);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* ============================================
   CATEGORY COLUMN
   Vertical column containing subcategory cards.
   All items center-aligned within the column.
   ============================================ */
.category-column {
    display: flex;
    flex-direction: column;
    align-items: center;  /* CENTER ALIGN all items */
    gap: var(--spacing-sm);
}

/* Category header - Simple and clean, center-aligned */
.category-header {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    padding: var(--spacing-sm) 0;
    text-align: center;
    border-bottom: 1px dashed var(--color-border);
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
    width: 100%;  /* Header takes full column width for border */
}

/* ============================================
   SUBCATEGORY ITEM
   Simple underlined text link for each career path.
   White background for items with both video + article.
   All items are CENTER-ALIGNED within their column.
   ============================================ */
.subcategory-card {
    padding: var(--spacing-xs) 0;
    text-align: center;  /* Center the text within the box */
    cursor: pointer;
    display: inline-block;  /* Only take up as much width as needed */
    
    /* Staggered animation on load */
    opacity: 0;
    animation: fadeInUp 0.5s ease-out forwards;
}

.subcategory-card__name {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.6;
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s ease, background-color 0.2s ease;
    display: inline;  /* Inline so it wraps naturally */
}

.subcategory-card:hover .subcategory-card__name {
    color: var(--color-accent);
}

/* Hide indicators */
.subcategory-card__indicators {
    display: none;
}

.subcategory-card__indicator {
    display: none;
}

/* ============================================
   POPOVER / POPUP
   Positioned next to the clicked subcategory.
   ============================================ */
.modal {
    /* Hidden by default - visibility controlled by JS */
    display: none;
}

/* Backdrop for closing popover */
.popover-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1999;
    background: transparent;
    display: none;
    /* Match cursor with subcategory cards and popover to prevent flickering.
       The backdrop appears above the grid (due to z-index) when popover opens,
       so without this, cursor would briefly change to default arrow. */
    cursor: pointer;
}

.popover-backdrop.is-open {
    display: block;
}

/* Popover container - minimal design, positioned next to item */
.popover {
    position: fixed;
    z-index: 2000;
    background-color: #ffffff;
    border: 1px dashed #999999;
    padding: var(--spacing-sm);
    min-width: 120px;
    /* Use pointer cursor to match subcategory-card - prevents cursor flickering 
       when popover appears adjacent to the hovered item */
    cursor: pointer;
    
    /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    pointer-events: none;  /* Disable pointer events when hidden */
    transition: 
        opacity 0.15s ease,
        visibility 0s linear 0.15s;
}

.popover.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;  /* Enable pointer events when visible */
    transition-delay: 0s;
}

/* Close button - hidden, click outside to close */
.popover__close {
    display: none;
}

/* Popover content */
.popover__content {
    padding: 0;
}

/* Hide title in minimal popover */
.popover__title {
    display: none;
}

/* Links section - simple vertical list */
.popover__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.popover__link {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: #1a1a1a;
    text-decoration: underline;
    text-underline-offset: 2px;
    padding: 2px 0;
    display: block;
}

.popover__link:hover {
    color: #cc0000;
}

.popover__link svg {
    display: none;
}

/* Video container - hidden in list, opens in separate modal */
.popover__video {
    display: none;
}

/* Empty state */
.popover__empty {
    color: #888888;
    font-style: italic;
    font-size: 0.85rem;
}

/* ============================================
   POPOVER - MULTIPLE PROJECTS LAYOUT
   Styles for displaying multiple people/projects.
   ============================================ */

/* Individual project entry */
.popover__project {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Person name styling */
.popover__person-name {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 2px;
}

.popover__person-name a {
    color: #1a1a1a;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.popover__person-name a:hover {
    color: #cc0000;
}

/* Links container within a project */
.popover__project-links {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-left: 8px;
}

/* No links placeholder */
.popover__no-links {
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: #888888;
    font-style: italic;
}

/* Separator between projects */
.popover__separator {
    border: none;
    border-top: 1px dashed #cccccc;
    margin: var(--spacing-xs) 0;
}

/* ============================================
   ABOUT PAGE
   Two-section layout for About Me and About Project.
   ============================================ */
.about-section {
    min-height: 100vh;
    /* Top padding accounts for fixed navbar + breathing room */
    padding: calc(var(--navbar-height) + var(--spacing-lg)) var(--spacing-lg) var(--spacing-xxl);
    
    /* Grey background - same as grid section */
    background-color: #e8e8e8;
    
    /* Subtle pattern overlay */
    background-image: 
        linear-gradient(rgba(201, 168, 124, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201, 168, 124, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    
    /* Light theme colors */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #555555;
}

.about-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
}

/* Individual about block (About Me / About Project) */
.about-block {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-block__title {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px dashed var(--color-border);
}

.about-block__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-block__content p {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-primary);
}

/* ============================================
   CONTACT SECTION
   Fixed position bottom-right corner.
   Shows QR codes for WeChat and Red Note.
   ============================================ */
.contact {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 500;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-md);
}

/* Hide toggle button - show QR codes directly */
.contact__toggle {
    display: none;
}

.contact__icon {
    display: none;
}

/* Contact panel - always visible, no toggle needed */
.contact__panel {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-md);
}

.contact__title {
    display: none;
}

.contact__links {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-md);
}

/* QR code item */
.contact__qr-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact__qr-label {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.contact__qr-code {
    width: 70px;
    height: 70px;
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact__qr-code:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.contact__qr-code img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* QR Code Lightbox */
.qr-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 4000;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.9);
    cursor: pointer;
    
    /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}

.qr-lightbox.is-open {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}

.qr-lightbox__image {
    max-width: 90vw;
    max-height: 90vh;
    width: 400px;
    height: 400px;
    background-color: #ffffff;
    padding: 20px;
    object-fit: contain;
}

.qr-lightbox__close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 3rem;
    color: #ffffff;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.qr-lightbox__close:hover {
    color: var(--color-accent);
}

/* ============================================
   VIDEO MODAL
   Full-screen video player overlay.
   ============================================ */
.video-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    
    /* Hidden by default */
    visibility: hidden;
    opacity: 0;
    transition: 
        visibility 0s linear 0.3s,
        opacity 0.3s ease;
}

.video-modal.is-open {
    visibility: visible;
    opacity: 1;
    transition-delay: 0s;
}

.video-modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.9);
}

.video-modal__container {
    position: relative;
    width: 100%;
    max-width: 900px;
}

.video-modal__close {
    position: absolute;
    top: -40px;
    right: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #ffffff;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.video-modal__close:hover {
    color: var(--color-accent);
}

.video-modal__content iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: none;
}

/* ============================================
   ANIMATIONS
   Keyframe animations used throughout.
   ============================================ */

/* Fade in from bottom */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Simple fade in */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Bounce down animation for scroll arrow */
@keyframes bounceDown {
    0%, 20%, 50%, 80%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    40% {
        transform: rotate(45deg) translateY(8px);
    }
    60% {
        transform: rotate(45deg) translateY(4px);
    }
}

/* ============================================
   RESPONSIVE STYLES
   Comprehensive breakpoints for all devices.
   ============================================ */

/* Large desktop (1400px+) */
@media (min-width: 1400px) {
    .categories-grid {
        gap: var(--spacing-lg);
    }
    
    .subcategory-card {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* Desktop to tablet transition (1200px) */
@media (max-width: 1200px) {
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-sm);
    }
    
    .category-header {
        font-size: 1rem;
        padding: var(--spacing-xs);
    }
}

/* Tablet (1024px) */
@media (max-width: 1024px) {
    :root {
        --navbar-height: 170px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .hero__nav-link {
        font-size: 0.8rem;
    }
    
    .grid-section {
        padding: calc(var(--navbar-height) + var(--spacing-md)) var(--spacing-md) var(--spacing-xxl);
    }
}

/* Tablet portrait (768px) */
@media (max-width: 768px) {
    :root {
        --navbar-height: 150px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-md);
        /* Override overflow:hidden to prevent logo cutoff in Chrome */
        overflow: visible !important;
    }
    
    .hero__content {
        padding: 0 var(--spacing-md);
    }
    
    /* Logo uses most of navbar height */
    .hero__logo-img {
        height: 130px !important;
        max-height: 130px !important;
    }
    
    /* Stack nav links vertically (Home on top, About below) */
    .hero__nav,
    .hero.is-collapsed .hero__nav,
    .hero--static-navbar .hero__nav {
        flex-direction: column;
        align-items: flex-end;
        gap: var(--spacing-xs);
        right: var(--spacing-md);
    }
    
    .hero__nav-link {
        font-size: 0.8rem;
    }
    
    .hero__scroll-indicator {
        font-size: 0.75rem;
    }
    
    /* Extra bottom padding for QR codes on tablet */
    .grid-section {
        padding-bottom: 200px;
    }
    
    .about-section {
        padding-bottom: 200px;
    }
    
    /* Popover adjustments for tablet */
    .popover {
        min-width: 100px;
    }
    
    /* Contact section adjustments */
    .contact__panel {
        width: 260px;
    }
}

/* Mobile landscape (640px) */
@media (max-width: 640px) {
    :root {
        --navbar-height: 130px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-header {
        font-size: 0.9rem;
        letter-spacing: 0.1em;
    }
    
    .subcategory-card__name {
        font-size: 0.9rem;
    }
    
    /* Logo uses most of navbar height */
    .hero__logo-img {
        height: 110px !important;
        max-height: 110px !important;
    }
    
    .hero__nav-link {
        font-size: 0.75rem;
        letter-spacing: 0.05em;
    }
}

/* Mobile portrait (480px) */
@media (max-width: 480px) {
    :root {
        --navbar-height: 110px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero {
        padding: var(--spacing-sm);
    }
    
    /* Logo uses most of navbar height */
    .hero__logo-img {
        height: 90px !important;
        max-height: 90px !important;
    }
    
    .hero__nav {
        right: var(--spacing-sm);
    }
    
    .hero__nav-link {
        font-size: 0.7rem;
    }
    
    /* Contact button - smaller and tucked away */
    .contact {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .contact__panel {
        width: calc(100vw - var(--spacing-lg));
        right: calc(-1 * var(--spacing-sm));
    }
    
    /* Popover on mobile */
    .popover {
        min-width: 90px;
    }
    
    .popover__link {
        font-size: 0.8rem;
    }
    
    /* Grid section padding - accounts for navbar + room for QR codes at bottom */
    .grid-section {
        padding: calc(var(--navbar-height) + var(--spacing-md)) var(--spacing-sm) 200px;
    }
    
    /* About section - room for QR codes at bottom */
    .about-section {
        padding-bottom: 200px;
    }
    
    /* Category header smaller on mobile */
    .category-header {
        font-size: 1.1rem;
        letter-spacing: 0.15em;
    }
}

/* Extra small mobile (360px) */
@media (max-width: 360px) {
    :root {
        --navbar-height: 100px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-column {
        /* Stack categories vertically on tiny screens */
        border-bottom: 1px solid var(--color-border);
        padding-bottom: var(--spacing-md);
    }
    
    .category-column:last-child {
        border-bottom: none;
    }
    
    /* Logo uses most of navbar height */
    .hero__logo-img {
        height: 80px !important;
        max-height: 80px !important;
    }
    
    .hero__nav-link {
        font-size: 0.65rem;
    }
    
    /* Contact QR codes smaller on tiny screens */
    .contact__qr-code {
        width: 55px;
        height: 55px;
    }
    
    .contact__qr-label {
        font-size: 0.75rem;
    }
    
    .qr-lightbox__image {
        width: 280px;
        height: 280px;
    }
}

/* ============================================
   REDUCED MOTION
   Respects user preference for reduced motion.
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* ============================================
   HIGH CONTRAST MODE
   Improves visibility for users with high contrast.
   ============================================ */
@media (prefers-contrast: high) {
    :root {
        --color-border: #444444;
        --color-border-light: #555555;
        --color-text-secondary: #aaaaaa;
    }
    
    .subcategory-card {
        border-width: 2px;
    }
    
    .modal__container {
        border-width: 2px;
    }
}

/* ============================================
   UTILITY CLASSES
   Helper classes for common patterns.
   ============================================ */
.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;
}