/* base.css — Complete. Do not modify this file. */

/* ============================================================
   ROOT & RESET
   ============================================================ */

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

:root {
    --color-bg: #0f1117;
    --color-surface: #1a1d27;
    --color-surface-raised: #22263a;
    --color-border: #2e3352;
    --color-text: #e2e8f0;
    --color-text-muted: #8892a4;
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-tag-layout: #0ea5e9;
    --color-tag-color: #f59e0b;
    --color-tag-animation: #10b981;
    --color-tag-typography: #ec4899;

    --font-sans: system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, monospace;

    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.25rem;

    --max-width: 72rem;
    --gutter: clamp(1.5rem, 5vw, 3rem);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-surface-raised);
    padding: 0.1em 0.35em;
    border-radius: var(--radius-sm);
}

/* ============================================================
   PROGRESS BAR
   ============================================================ */

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, var(--color-accent), var(--color-accent-light));
    transform-origin: left;
    transform: scaleX(0);
    z-index: 200;
}

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--color-bg) 85%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-accent-light);
    letter-spacing: -0.02em;
}

.site-nav {
    display: flex;
    gap: 2rem;
}

.site-nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.site-nav a:hover {
    color: var(--color-text);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 6rem var(--gutter) 5rem;
    text-align: center;
}

.hero-eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent-light);
    margin-bottom: 1rem;
    /* Start state for WAAPI entrance — gallery.js animates this in */
    opacity: 0;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    text-wrap: balance;
    margin-bottom: 1.5rem;
    /* Start state for WAAPI entrance — gallery.js animates this in */
    opacity: 0;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 42rem;
    margin: 0 auto;
    text-wrap: balance;
    /* Start state for WAAPI entrance — gallery.js animates this in */
    opacity: 0;
}

/* ============================================================
   GALLERY SECTION
   ============================================================ */

.gallery-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem var(--gutter);
}

.gallery-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.gallery-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ---- Filter Controls ---- */

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.4rem 1rem;
    border-radius: 99px;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.filter-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
    font-weight: 600;
}

/* ---- Card Grid ---- */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* ---- Card ---- */

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    /* Start state for scroll-driven entrance — animations.css animates this in */
    opacity: 0;
    transform: translateY(1.5rem);
}

.card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.card-tag {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    align-self: flex-start;
    padding: 0.2rem 0.6rem;
    border-radius: 99px;
}

.card[data-category="layout"] .card-tag {
    background: color-mix(in srgb, var(--color-tag-layout) 15%, transparent);
    color: var(--color-tag-layout);
}

.card[data-category="color"] .card-tag {
    background: color-mix(in srgb, var(--color-tag-color) 15%, transparent);
    color: var(--color-tag-color);
}

.card[data-category="animation"] .card-tag {
    background: color-mix(in srgb, var(--color-tag-animation) 15%, transparent);
    color: var(--color-tag-animation);
}

.card[data-category="typography"] .card-tag {
    background: color-mix(in srgb, var(--color-tag-typography) 15%, transparent);
    color: var(--color-tag-typography);
}

.card-title {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.3;
}

.card-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

.card.hidden {
    display: none;
}

/* ============================================================
   FEATURE SECTIONS
   ============================================================ */

#features {
    max-width: var(--max-width);
    margin: 2rem auto 0;
    padding: 0 var(--gutter);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem 0;
    border-top: 1px solid var(--color-border);
}

.feature-section--right {
    direction: rtl;
}

.feature-section--right > * {
    direction: ltr;
}

.feature-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.feature-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-content h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    text-wrap: balance;
}

.feature-content p {
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Start states for scroll-driven entrance — animations.css animates these in */
.feature-section--left {
    opacity: 0;
    transform: translateX(-3rem);
}

.feature-section--right {
    opacity: 0;
    transform: translateX(3rem);
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem var(--gutter);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-align: center;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 700px) {
    .feature-section {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .feature-section--right {
        direction: ltr;
    }

    .gallery-header {
        flex-direction: column;
        align-items: flex-start;
    }
}