/* AV-Parts Design System - Automotive Tech (premium, restrained futurism)
   Fonts load via <link> in HTML (not @import) for better LCP. */

:root {
    /* Semantic tokens (TZ) */
    --background: #0E1210;
    --background-secondary: #131916;
    --surface: #1A211C;
    --surface-elevated: #222B24;
    --surface-hover: #2A342C;
    --border: rgba(148, 168, 132, 0.16);
    --border-strong: rgba(148, 168, 132, 0.28);
    --text-primary: #F1F4EE;
    --text-secondary: #B7C4B0;
    --text-muted: #7F8F78;
    --accent: #7A9368;
    --accent-hover: #91AB7C;
    --accent-soft: rgba(122, 147, 104, 0.14);
    --accent-glow: rgba(122, 147, 104, 0.35);
    --success: #4ADE80;
    --warning: #EAB308;
    --danger: #F87171;

    /* Brand swamp aliases (backward compatible) */
    --swamp-bg: var(--background);
    --swamp-surface: var(--surface);
    --swamp-border: var(--border);
    --swamp-primary: var(--accent);
    --swamp-primary-hover: var(--accent-hover);
    --swamp-primary-light: var(--accent-soft);
    --swamp-dark: #0A0D0B;
    --swamp-dark-muted: #9AAB92;
    --swamp-text: var(--text-primary);
    --swamp-text-muted: var(--text-muted);
    --swamp-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
    --swamp-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
    --swamp-radius: 12px;
    --swamp-radius-lg: 16px;
    --swamp-max: 80rem;

    /* Layout */
    --header-h: 4rem;
    --header-h-compact: 3.5rem;
    --bottom-nav-h: 4.25rem;
    --container: min(100% - 2rem, var(--swamp-max));
    --font-sans: __Inter_fcbcbf, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

@media (min-width: 768px) {
    :root { --header-h: 4.5rem; }
}

/* Base */
html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body.home-page {
    background: var(--background) !important;
    color: var(--text-primary) !important;
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

body.home-page main {
    background: transparent !important;
    padding-bottom: calc(var(--bottom-nav-h) + env(safe-area-inset-bottom));
}

@media (min-width: 768px) {
    body.home-page main {
        padding-bottom: 0;
    }
}

/* Skip link - скрыт, виден только при Tab / focus-visible */
.skip-link,
body.home-page .skip-link {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    clip-path: inset(50%) !important;
    white-space: nowrap !important;
    border: 0 !important;
    background: var(--accent, #7A9368) !important;
    color: #0E1210 !important;
    font-weight: 700 !important;
    text-decoration: none !important;
    z-index: 10050;
}
.skip-link:focus,
.skip-link:focus-visible,
body.home-page .skip-link:focus,
body.home-page .skip-link:focus-visible {
    position: fixed !important;
    left: 0.75rem !important;
    top: 0.75rem !important;
    width: auto !important;
    height: auto !important;
    margin: 0 !important;
    padding: 0.75rem 1rem !important;
    overflow: visible !important;
    clip: auto !important;
    clip-path: none !important;
    white-space: normal !important;
    border-radius: 10px !important;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35) !important;
}

body.home-page a:focus-visible,
body.home-page button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Tech grid background utility */
.av-grid-bg {
    position: relative;
    isolation: isolate;
}
.av-grid-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(122, 147, 104, 0.18), transparent 55%),
        linear-gradient(180deg, var(--background-secondary) 0%, var(--background) 100%);
    pointer-events: none;
}
.av-grid-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(148, 168, 132, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 168, 132, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 75%);
    pointer-events: none;
    opacity: 0.7;
}

/* Typography scale */
.av-h1, .home-h1, .page-h1 {
    font-family: var(--font-sans);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--text-primary);
}
.av-h2, .home-h2, .page-prose h2 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--text-primary);
}
.av-price {
    font-family: var(--font-mono);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}
.av-oem, .av-mono {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.02em;
}

/* Buttons */
.home-btn,
.av-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0.7rem 1.25rem;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.2s var(--ease-out), border-color 0.2s, color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.home-btn--primary,
.av-btn--primary {
    background: var(--accent);
    color: #0E1210 !important;
    box-shadow: 0 0 0 1px rgba(122, 147, 104, 0.3), 0 8px 24px rgba(122, 147, 104, 0.2);
}
.home-btn--primary:hover,
.av-btn--primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}
.home-btn--secondary,
.av-btn--secondary {
    background: transparent;
    color: var(--text-primary) !important;
    border-color: var(--border-strong);
}
.home-btn--secondary:hover,
.av-btn--secondary:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
}
.home-btn--ghost {
    background: var(--surface);
    color: var(--text-secondary) !important;
    border-color: var(--border);
}

/* Badges / status */
.av-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-family: var(--font-mono);
}
.av-badge--live {
    background: rgba(74, 222, 128, 0.12);
    color: var(--success);
    border: 1px solid rgba(74, 222, 128, 0.25);
}
.av-badge--oem {
    background: var(--accent-soft);
    color: var(--accent-hover);
    border: 1px solid var(--border-strong);
}
.av-badge--fast {
    background: rgba(234, 179, 8, 0.12);
    color: #FACC15;
    border: 1px solid rgba(234, 179, 8, 0.25);
}

/* Surface card */
.av-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--swamp-radius-lg);
    box-shadow: var(--swamp-shadow);
    transition: border-color 0.2s, transform 0.2s var(--ease-out), box-shadow 0.2s;
}
.av-card:hover {
    border-color: var(--border-strong);
}
.av-card--glass {
    background: rgba(26, 33, 28, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

/* Inputs */
.av-input,
.form-input,
.form-textarea,
.catalog-input,
.catalog-select {
    width: 100%;
    min-height: 2.75rem;
    padding: 0.65rem 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
    background: var(--background-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.av-input:focus,
.form-input:focus,
.form-textarea:focus,
.catalog-input:focus,
.catalog-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.av-input::placeholder,
.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

/* Skeleton */
.av-skeleton {
    background: linear-gradient(90deg, var(--surface) 25%, var(--surface-hover) 50%, var(--surface) 75%);
    background-size: 200% 100%;
    animation: av-shimmer 1.4s ease-in-out infinite;
    border-radius: 8px;
}
@keyframes av-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Reveal on scroll - content visible by default (no FOUC) */
.av-reveal {
    opacity: 1;
    transform: none;
}
html.js .av-reveal:not(.is-visible) {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
html.js .av-reveal.is-visible {
    opacity: 1;
    transform: none;
}
@media (prefers-reduced-motion: reduce) {
    html.js .av-reveal:not(.is-visible),
    .av-reveal { opacity: 1 !important; transform: none !important; }
}

/* Container */
.home-container {
    width: var(--container);
    margin-left: auto;
    margin-right: auto;
}

/* Visually hidden (a11y) */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    clip-path: inset(50%) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

    text-align: center;
    padding: 2.5rem 1.25rem;
    color: var(--text-muted);
}
.av-empty__title {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.125rem;
    margin: 0 0 0.5rem;
}
.av-empty__text {
    margin: 0 0 1.25rem;
    font-size: 0.9375rem;
}