/* ===================================
   NEO-BRUTALIST SPECIMEN ARCHIVE
   =================================== */

:root {
    /* Core Colors - High Contrast */
    --color-bg: #0a0a0a;
    --color-surface: #1a1a1a;
    --color-cream: #f5f1e8;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-dark: #2a2a2a;
    --color-gray-mid: #666666;
    --color-gray-light: #999999;

    /* Vivid Category Colors */
    --color-tools: #00d9ff;        /* Cyan */
    --color-games: #ff3366;        /* Hot Pink */
    --color-education: #9d4edd;    /* Purple */
    --color-creative: #ff6b35;     /* Orange */
    --color-productivity: #06ffa5; /* Mint */
    --color-experimental: #ffbe0b; /* Yellow */

    /* Typography */
    --font-display: 'Syne', sans-serif;
    --font-mono: 'Azeret Mono', monospace;
    --font-body: 'Syne', sans-serif;

    /* Spacing */
    --spacing-2xs: 0.25rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Effects */
    --shadow-brutal: 8px 8px 0px rgba(0, 0, 0, 0.8);
    --shadow-brutal-lg: 12px 12px 0px rgba(0, 0, 0, 0.9);
    --shadow-brutal-xl: 16px 16px 0px rgba(0, 0, 0, 1);
    --shadow-soft: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.1);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===================================
   Reset & Base
   =================================== */

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

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-cream);
    line-height: 1.5;
    overflow-x: hidden;
    position: relative;
}

/* Animated Grain Texture */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='3.5' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    animation: grain 8s steps(10) infinite;
}

@keyframes grain {
    0%, 100% { transform: translate(0, 0); }
    10% { transform: translate(-5%, -10%); }
    20% { transform: translate(-15%, 5%); }
    30% { transform: translate(7%, -25%); }
    40% { transform: translate(-5%, 25%); }
    50% { transform: translate(-15%, 10%); }
    60% { transform: translate(15%, 0%); }
    70% { transform: translate(0%, 15%); }
    80% { transform: translate(3%, 35%); }
    90% { transform: translate(-10%, 10%); }
}

/* Geometric Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(135deg, rgba(0, 217, 255, 0.03) 0%, transparent 50%),
        linear-gradient(-135deg, rgba(255, 51, 102, 0.03) 0%, transparent 50%);
    z-index: 0;
    pointer-events: none;
}

/* Diagonal Lines Pattern */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 100px,
        rgba(255, 255, 255, 0.01) 100px,
        rgba(255, 255, 255, 0.01) 102px
    );
    z-index: 0;
    pointer-events: none;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    position: relative;
    z-index: 1;
}

/* ===================================
   Header
   =================================== */

.header {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    border-bottom: 3px solid var(--color-gray-dark);
    position: relative;
}

.header-top {
    margin-bottom: var(--spacing-xl);
}

.archive-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: center;
    opacity: 0;
    transform: translateY(-20px);
    animation: slideDown 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

@keyframes slideDown {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.label-line {
    height: 2px;
    width: 60px;
    background: linear-gradient(90deg, transparent, var(--color-gray-mid), transparent);
}

.label-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--color-gray-light);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.logo-section {
    flex: 1;
    min-width: 300px;
}

.title-wrapper {
    position: relative;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    transform: translateX(-50px);
    animation: slideRight 1s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

@keyframes slideRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.title-bg {
    position: absolute;
    top: 50%;
    left: -20px;
    transform: translateY(-50%);
    font-family: var(--font-display);
    font-size: clamp(8rem, 20vw, 15rem);
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 2px rgba(255, 255, 255, 0.05);
    z-index: -1;
    pointer-events: none;
    user-select: none;
}

.site-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 800;
    line-height: 0.9;
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    position: relative;
}

.title-number {
    font-family: var(--font-mono);
    color: var(--color-white);
    font-weight: 700;
    letter-spacing: -0.05em;
    text-shadow: 4px 4px 0px rgba(0, 217, 255, 0.5);
}

.title-text {
    color: var(--color-cream);
    letter-spacing: -0.02em;
}

.site-subtitle {
    font-family: var(--font-mono);
    font-size: clamp(0.875rem, 2vw, 1.125rem);
    color: var(--color-gray-light);
    letter-spacing: 0.05em;
    font-weight: 400;
    margin-top: var(--spacing-sm);
    opacity: 0;
    animation: fadeIn 0.8s ease-out 0.8s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.header-stats {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
    opacity: 0;
    transform: translateX(50px);
    animation: slideLeft 1s cubic-bezier(0.4, 0, 0.2, 1) 0.6s forwards;
}

@keyframes slideLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.stat-divider {
    width: 2px;
    height: 60px;
    background: var(--color-gray-dark);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
}

.stat-number {
    font-family: var(--font-mono);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1;
    letter-spacing: -0.05em;
}

.stat-separator {
    color: var(--color-gray-mid);
    margin: 0 var(--spacing-2xs);
}

.stat-total {
    color: var(--color-gray-mid);
}

/* ===================================
   Controls Section
   =================================== */

.controls-section {
    padding: var(--spacing-2xl) 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.search-wrapper {
    max-width: 600px;
    width: 100%;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 1s forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-label {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
    margin-bottom: var(--spacing-xs);
}

.search-input {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) var(--spacing-3xl);
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 500;
    background: var(--color-surface);
    border: 2px solid var(--color-gray-dark);
    color: var(--color-cream);
    transition: all var(--transition-base);
    outline: none;
}

.search-input:focus {
    border-color: var(--color-white);
    box-shadow: var(--shadow-brutal);
    transform: translate(-4px, -4px);
    background: var(--color-gray-dark);
}

.search-input::placeholder {
    color: var(--color-gray-mid);
}

.search-icon {
    position: absolute;
    left: var(--spacing-lg);
    bottom: var(--spacing-lg);
    color: var(--color-gray-light);
    font-size: 1rem;
    pointer-events: none;
    transition: color var(--transition-base);
}

.search-input:focus + .search-icon {
    color: var(--color-white);
}

.filter-section {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 1.2s forwards;
}

.filter-label {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
    margin-bottom: var(--spacing-md);
}

.filter-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--color-surface);
    border: 2px solid var(--color-gray-dark);
    color: var(--color-cream);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--btn-color, var(--color-white));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
    z-index: -1;
}

.filter-btn:hover {
    border-color: var(--btn-color, var(--color-white));
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px var(--btn-color, rgba(255, 255, 255, 0.3));
}

.filter-btn:hover::before {
    transform: scaleX(1);
}

.filter-btn:hover .btn-label {
    color: var(--color-black);
}

.filter-btn:hover .btn-icon {
    color: var(--color-black);
}

.filter-btn.active {
    background: var(--btn-color, var(--color-white));
    border-color: var(--btn-color, var(--color-white));
    color: var(--color-black);
    box-shadow: var(--shadow-brutal);
    transform: translate(-4px, -4px);
}

.filter-btn.active .btn-label {
    color: var(--color-black);
}

.filter-btn.active .btn-icon {
    color: var(--color-black);
}

/* Category Button Colors */
.filter-btn[data-category="tools"] {
    --btn-color: var(--color-tools);
}

.filter-btn[data-category="games"] {
    --btn-color: var(--color-games);
}

.filter-btn[data-category="education"] {
    --btn-color: var(--color-education);
}

.filter-btn[data-category="creative"] {
    --btn-color: var(--color-creative);
}

.filter-btn[data-category="productivity"] {
    --btn-color: var(--color-productivity);
}

.filter-btn[data-category="experimental"] {
    --btn-color: var(--color-experimental);
}

.btn-icon {
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

/* ===================================
   Projects Grid - Masonry Layout
   =================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(350px, 100%), 1fr));
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-4xl);
    perspective: 1000px;
}

.project-card {
    background: var(--color-surface);
    border: 3px solid var(--color-gray-dark);
    overflow: hidden;
    transition: all var(--transition-smooth);
    opacity: 0;
    transform: translateY(40px) rotateX(10deg);
    animation: cardReveal 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    position: relative;
    transform-style: preserve-3d;
}

@keyframes cardReveal {
    to {
        opacity: 1;
        transform: translateY(0) rotateX(0deg);
    }
}

/* Stagger card animations */
.project-card:nth-child(1) { animation-delay: 1.4s; }
.project-card:nth-child(2) { animation-delay: 1.5s; }
.project-card:nth-child(3) { animation-delay: 1.6s; }
.project-card:nth-child(4) { animation-delay: 1.7s; }
.project-card:nth-child(5) { animation-delay: 1.8s; }
.project-card:nth-child(6) { animation-delay: 1.9s; }
.project-card:nth-child(n+7) { animation-delay: 2s; }

/* Category color accent bar */
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--category-color, var(--color-white));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-smooth);
}

.project-card:hover::before {
    transform: scaleX(1);
}

/* 3D Tilt Effect on Hover */
.project-card:hover {
    border-color: var(--category-color, var(--color-white));
    transform: translate(-8px, -8px) rotateX(2deg) rotateY(2deg);
    box-shadow:
        12px 12px 0px rgba(0, 0, 0, 0.9),
        0 20px 60px rgba(0, 0, 0, 0.6);
}

.project-card.featured {
    grid-column: span 2;
}

.project-card.hidden {
    display: none;
}

.card-header {
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    border-bottom: 2px solid var(--color-gray-dark);
    background: var(--color-bg);
}

.card-icon {
    width: 70px;
    height: 70px;
    flex-shrink: 0;
    background: var(--category-color, var(--color-white));
    color: var(--color-black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    border: 3px solid var(--color-black);
    box-shadow: 4px 4px 0px rgba(0, 0, 0, 0.8);
    transition: all var(--transition-base);
}

.project-card:hover .card-icon {
    transform: rotate(-5deg) scale(1.05);
    box-shadow: 6px 6px 0px rgba(0, 0, 0, 1);
}

.card-meta {
    flex: 1;
}

.card-number {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
    margin-bottom: var(--spacing-xs);
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-2xs);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.card-title-cn {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-gray-light);
    margin-top: var(--spacing-2xs);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-description {
    font-size: 0.9375rem;
    color: var(--color-gray-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.tag {
    padding: var(--spacing-2xs) var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-gray-dark);
    color: var(--color-gray-light);
    text-transform: uppercase;
    transition: all var(--transition-base);
}

.project-card:hover .tag {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--category-color, var(--color-white));
    color: var(--color-cream);
}

.card-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 2px solid var(--color-gray-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg);
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--category-color, var(--color-white));
    color: var(--color-black);
    text-decoration: none;
    border: 2px solid var(--color-black);
    transition: all var(--transition-base);
    position: relative;
}

.card-link:hover {
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px rgba(0, 0, 0, 1);
}

.card-link i {
    font-size: 0.625rem;
    transition: transform var(--transition-base);
}

.card-link:hover i {
    transform: translateX(4px);
}

.card-status {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
    text-transform: uppercase;
}

/* Category Colors */
.project-card[data-category="tools"] { --category-color: var(--color-tools); }
.project-card[data-category="games"] { --category-color: var(--color-games); }
.project-card[data-category="education"] { --category-color: var(--color-education); }
.project-card[data-category="creative"] { --category-color: var(--color-creative); }
.project-card[data-category="productivity"] { --category-color: var(--color-productivity); }
.project-card[data-category="experimental"] { --category-color: var(--color-experimental); }

/* ===================================
   No Results
   =================================== */

.no-results {
    text-align: center;
    padding: var(--spacing-4xl) var(--spacing-xl);
}

.no-results.hidden {
    display: none;
}

.no-results-icon {
    font-size: 5rem;
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-lg);
}

.no-results-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-gray-light);
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.no-results-hint {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-gray-mid);
}

/* ===================================
   Footer
   =================================== */

.footer {
    border-top: 3px solid var(--color-gray-dark);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-4xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-text {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-gray-light);
    letter-spacing: 0.05em;
}

.footer-name {
    font-weight: 700;
    color: var(--color-white);
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-gray-mid);
    letter-spacing: 0.1em;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--color-surface);
    border: 2px solid var(--color-gray-dark);
    color: var(--color-cream);
    text-decoration: none;
    transition: all var(--transition-base);
}

.footer-link:hover {
    border-color: var(--color-white);
    background: var(--color-white);
    color: var(--color-black);
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px rgba(255, 255, 255, 0.3);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1200px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: var(--spacing-xl);
    }

    .project-card.featured {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .header {
        padding: var(--spacing-xl) 0;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xl);
    }

    .header-stats {
        width: 100%;
        justify-content: flex-start;
        gap: var(--spacing-lg);
    }

    .stat-divider {
        height: 40px;
    }

    .title-bg {
        font-size: clamp(5rem, 25vw, 10rem);
        left: -10px;
    }

    .logo-section {
        min-width: unset;
        width: 100%;
    }

    .site-title {
        font-size: clamp(2rem, 10vw, 3.5rem);
    }

    .controls-section {
        padding: var(--spacing-xl) 0;
    }

    .search-wrapper {
        max-width: 100%;
    }

    .filter-wrapper {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding-bottom: var(--spacing-xs);
    }

    .filter-wrapper::-webkit-scrollbar {
        display: none;
    }

    .filter-btn {
        flex: 0 0 auto;
        min-width: auto;
        white-space: nowrap;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .project-card:hover {
        transform: translate(-4px, -4px);
        box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.9);
    }

    .card-header {
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
    }

    .card-icon {
        width: 56px;
        height: 56px;
        font-size: 1.5rem;
    }

    .card-body {
        padding: var(--spacing-lg);
    }

    .card-footer {
        padding: var(--spacing-md) var(--spacing-lg);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .footer-links {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-lg) 0;
    }

    .archive-label {
        flex-wrap: wrap;
        text-align: center;
    }

    .label-line {
        width: 30px;
    }

    .label-text {
        font-size: 0.625rem;
        letter-spacing: 0.15em;
    }

    .title-bg {
        display: none;
    }

    .site-title {
        flex-direction: column;
        gap: var(--spacing-xs);
        font-size: clamp(1.75rem, 12vw, 2.5rem);
    }

    .site-subtitle {
        font-size: 0.75rem;
    }

    .header-stats {
        flex-direction: row;
        justify-content: space-between;
        width: 100%;
    }

    .stat-divider {
        height: 30px;
    }

    .stat-label {
        font-size: 0.5rem;
    }

    .stat-number {
        font-size: 1.75rem;
    }

    .search-label,
    .filter-label {
        font-size: 0.5625rem;
    }

    .search-input {
        padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-2xl);
        font-size: 0.875rem;
    }

    .search-icon {
        left: var(--spacing-md);
        bottom: 50%;
        transform: translateY(50%);
        font-size: 0.875rem;
    }

    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.625rem;
    }

    .btn-icon {
        font-size: 0.75rem;
    }

    .card-header {
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        flex-direction: column;
        align-items: flex-start;
    }

    .card-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }

    .card-number {
        font-size: 0.5625rem;
    }

    .card-title {
        font-size: 1.25rem;
    }

    .card-title-cn {
        font-size: 0.875rem;
    }

    .card-body {
        padding: var(--spacing-md);
    }

    .card-description {
        font-size: 0.875rem;
        margin-bottom: var(--spacing-md);
    }

    .card-tags {
        margin-bottom: var(--spacing-md);
    }

    .tag {
        font-size: 0.5625rem;
        padding: var(--spacing-2xs) var(--spacing-xs);
    }

    .card-footer {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .card-link {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.625rem;
    }

    .card-status {
        font-size: 0.5625rem;
    }

    .footer {
        padding: var(--spacing-xl) 0;
        margin-top: var(--spacing-2xl);
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    .footer-text {
        font-size: 0.75rem;
    }

    .footer-meta {
        font-size: 0.625rem;
    }

    .footer-links {
        width: 100%;
    }

    .footer-link {
        flex: 1;
        justify-content: center;
    }

    .no-results-icon {
        font-size: 3.5rem;
    }

    .no-results-text {
        font-size: 1.125rem;
    }

    .no-results-hint {
        font-size: 0.75rem;
    }
}

/* Extra small devices (< 360px) */
@media (max-width: 360px) {
    .container {
        padding: 0 var(--spacing-xs);
    }

    .site-title {
        font-size: 1.5rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .card-title {
        font-size: 1.125rem;
    }

    .header-stats {
        gap: var(--spacing-sm);
    }
}

/* ===================================
   Touch Device Enhancements
   =================================== */

@media (hover: none) and (pointer: coarse) {
    /* Remove hover-only effects on touch devices */
    .project-card:hover {
        transform: none;
        box-shadow: none;
    }

    .project-card:hover::before {
        transform: scaleX(0);
    }

    .project-card:active {
        transform: translate(-4px, -4px);
        box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.9);
        border-color: var(--category-color, var(--color-white));
    }

    .project-card:active::before {
        transform: scaleX(1);
    }

    .filter-btn:hover {
        transform: none;
        box-shadow: none;
    }

    .filter-btn:hover::before {
        transform: scaleX(0);
    }

    .filter-btn:active {
        transform: translate(-2px, -2px);
        box-shadow: 4px 4px 0px var(--btn-color, rgba(255, 255, 255, 0.3));
    }

    .card-link:hover {
        transform: none;
        box-shadow: none;
    }

    .card-link:active {
        transform: translate(-2px, -2px);
        box-shadow: 4px 4px 0px rgba(0, 0, 0, 1);
    }

    .footer-link:hover {
        transform: none;
        box-shadow: none;
        background: var(--color-surface);
        border-color: var(--color-gray-dark);
        color: var(--color-cream);
    }

    .footer-link:active {
        border-color: var(--color-white);
        background: var(--color-white);
        color: var(--color-black);
        transform: translate(-2px, -2px);
        box-shadow: 4px 4px 0px rgba(255, 255, 255, 0.3);
    }

    /* Increase touch targets */
    .filter-btn {
        min-height: 44px;
    }

    .card-link {
        min-height: 44px;
    }

    .footer-link {
        min-height: 44px;
    }

    .search-input {
        min-height: 48px;
    }
}

/* ===================================
   Utilities & Accessibility
   =================================== */

.hidden {
    display: none !important;
}

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

    .grain-overlay {
        animation: none;
    }
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 3px solid var(--color-white);
    outline-offset: 4px;
}

/* Selection styles */
::selection {
    background: var(--color-white);
    color: var(--color-black);
}

::-moz-selection {
    background: var(--color-white);
    color: var(--color-black);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-gray-dark);
    border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-mid);
}