/* ===== CSS Variables ===== */
:root {
    --color-bg-primary: #0a0e27;
    --color-bg-secondary: #141b3d;
    --color-bg-card: rgba(20, 27, 61, 0.6);
    --color-accent-purple: #8b5cf6;
    --color-accent-blue: #3b82f6;
    --color-accent-pink: #ec4899;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: rgba(148, 163, 184, 0.1);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Container ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== Header ===== */
.gallery-header {
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
}

.back-link {
    position: absolute;
    left: var(--spacing-lg);
    top: var(--spacing-lg);
    color: var(--color-accent-purple);
    text-decoration: none;
    font-weight: 500;
    transition: gap var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-link:hover {
    gap: 0.75rem;
}

.gallery-title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.gallery-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* ===== Search and Filter Section ===== */
.search-filter-section {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.search-container {
    position: relative;
    width: 100%;
    max-width: 500px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-right: 3rem;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent-purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-clear {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border: none;
    background: var(--color-accent-purple);
    color: var(--color-text-primary);
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.search-clear:hover {
    background: var(--color-accent-pink);
    transform: translateY(-50%) rotate(90deg);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--color-accent-purple);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-blue));
    border-color: transparent;
    color: var(--color-text-primary);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

/* ===== No Results Message ===== */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

.no-results::before {
    content: '🔍';
    display: block;
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ===== Icon Card Hidden State ===== */
.icon-card.hidden {
    display: none;
}


/* ===== Main Gallery ===== */
.gallery-main {
    padding: var(--spacing-xl) 0;
}

/* ===== Icon Grid ===== */
.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ===== Icon Card ===== */
.icon-card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.icon-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-purple), var(--color-accent-blue));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

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

.icon-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.3);
    border-color: rgba(139, 92, 246, 0.5);
}

.icon-name {
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-top: var(--spacing-sm);
    text-transform: capitalize;
}

/* ===== 3D Viewer Container ===== */
.viewer-container {
    width: 100%;
    height: 250px;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
}

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

/* ===== Loading State ===== */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.loading::after {
    content: '...';
    animation: loading 1.5s infinite;
}

@keyframes loading {

    0%,
    20% {
        content: '.';
    }

    40% {
        content: '..';
    }

    60%,
    100% {
        content: '...';
    }
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    max-width: 900px;
    margin: 2rem auto;
    padding: var(--spacing-xl);
    z-index: 1001;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    border: none;
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    font-size: 2rem;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.modal-close:hover {
    background: var(--color-accent-purple);
    transform: rotate(90deg);
}

.modal-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    text-transform: capitalize;
}

.modal-viewer {
    width: 100%;
    height: 600px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.modal-instructions {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: var(--spacing-md);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .icon-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .gallery-title {
        font-size: 2rem;
    }

    .icon-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: var(--spacing-md);
    }

    .back-link {
        position: static;
        display: inline-flex;
        margin-bottom: var(--spacing-md);
    }

    .modal-viewer {
        height: 400px;
    }

    /* Search and filter responsive */
    .search-filter-section {
        margin-top: var(--spacing-lg);
    }

    .filter-buttons {
        gap: var(--spacing-xs);
    }

    .filter-btn {
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .icon-grid {
        grid-template-columns: 1fr;
    }

    .gallery-title {
        font-size: 1.75rem;
    }

    .modal-content {
        padding: var(--spacing-md);
    }

    .modal-viewer {
        height: 300px;
    }

    /* Search and filter responsive */
    .search-container {
        max-width: 100%;
    }

    .search-input {
        font-size: 0.875rem;
        padding: var(--spacing-sm) var(--spacing-md);
        padding-right: 2.5rem;
    }

    .filter-buttons {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
        min-width: fit-content;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.icon-card {
    animation: fadeIn 0.5s ease backwards;
}

.icon-card:nth-child(1) {
    animation-delay: 0.05s;
}

.icon-card:nth-child(2) {
    animation-delay: 0.1s;
}

.icon-card:nth-child(3) {
    animation-delay: 0.15s;
}

.icon-card:nth-child(4) {
    animation-delay: 0.2s;
}

.icon-card:nth-child(5) {
    animation-delay: 0.25s;
}

.icon-card:nth-child(6) {
    animation-delay: 0.3s;
}

.icon-card:nth-child(7) {
    animation-delay: 0.35s;
}

.icon-card:nth-child(8) {
    animation-delay: 0.4s;
}

.icon-card:nth-child(9) {
    animation-delay: 0.45s;
}

.icon-card:nth-child(10) {
    animation-delay: 0.5s;
}

.icon-card:nth-child(11) {
    animation-delay: 0.55s;
}

.icon-card:nth-child(12) {
    animation-delay: 0.6s;
}

.icon-card:nth-child(13) {
    animation-delay: 0.65s;
}

.icon-card:nth-child(14) {
    animation-delay: 0.7s;
}

.icon-card:nth-child(15) {
    animation-delay: 0.75s;
}

.icon-card:nth-child(16) {
    animation-delay: 0.8s;
}

.icon-card:nth-child(17) {
    animation-delay: 0.85s;
}

.icon-card:nth-child(18) {
    animation-delay: 0.9s;
}

.icon-card:nth-child(19) {
    animation-delay: 0.95s;
}

.icon-card:nth-child(20) {
    animation-delay: 1s;
}