/* Knowledge365 components - layout, components and utilities layers.
   Every value is a token from tokens.css; the hardcoded-value audit fails on
   colour or px/rem literals outside tokens.css. */

@layer layout {
    .container {
        width: 100%;
        max-width: var(--container);
        margin-inline: auto;
        padding-inline: var(--gutter);
    }

    .library {
        display: grid;
        gap: var(--space-9);
        padding-block: var(--space-section) var(--space-12);
    }

    .site-footer {
        padding-block: var(--space-6);
        border-top: var(--hairline) solid var(--color-border);
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
    }

    .site-footer__inner {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-4);
        align-items: center;
        justify-content: space-between;
    }
}

@layer components {
    .header-sentinel {
        height: var(--hairline);
    }

    .theme-toggle__icon {
        width: var(--icon-size);
        height: var(--icon-size);
    }

    .skip-link {
        position: absolute;
        z-index: 10;
        top: var(--space-3);
        left: var(--space-3);
        padding: var(--space-2) var(--space-4);
        background: var(--color-surface);
        color: var(--color-accent);
        border: var(--hairline) solid var(--color-border);
        border-radius: var(--radius-sm);
        box-shadow: var(--shadow-2);
        transform: translateY(calc(-100% - var(--space-8)));
    }

    .skip-link:focus,
    .skip-link:focus-visible {
        transform: none;
    }

    .site-header {
        position: sticky;
        top: 0;
        z-index: 5;
        background: color-mix(in oklab, var(--color-bg) 88%, transparent);
        border-bottom: var(--hairline) solid transparent;
    }

    @supports (backdrop-filter: blur(1px)) {
        .site-header {
            backdrop-filter: blur(var(--blur-header));
        }
    }

    .site-header[data-scrolled="true"] {
        border-bottom-color: var(--color-border);
    }

    .site-header__inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-4);
        min-height: var(--space-12);
    }

    .wordmark {
        display: inline-flex;
        align-items: center;
        gap: var(--space-3);
        color: var(--color-ink);
        text-decoration: none;
    }

    .wordmark__name {
        font-family: var(--font-display);
        font-size: var(--text-lg);
        font-weight: 600;
        letter-spacing: var(--tracking-heading);
    }

    .wordmark__rule {
        align-self: stretch;
        width: var(--hairline);
        margin-block: var(--space-2);
        background: var(--color-gold);
    }

    /* Mobile viewports (below 640 px): the wordmark keeps "365 Architect";
       the "Knowledge" suffix is hidden (addendum section 4). */
    .wordmark__sub {
        display: none;
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    @media (min-width: 640px) {
        .wordmark__sub {
            display: block;
        }
    }

    .theme-toggle {
        display: none;
        align-items: center;
        gap: var(--space-2);
        padding: var(--space-2);
        border-radius: var(--radius-sm);
        color: var(--color-ink-muted);
    }

    .js .theme-toggle {
        display: inline-flex;
    }

    .theme-toggle:hover {
        background: var(--color-surface-2);
        color: var(--color-ink);
    }

    .hero {
        position: relative;
        overflow: hidden;
        background: var(--color-bg);
        border-bottom: var(--hairline) solid var(--color-border);
    }

    /* Paper grain: inline SVG feTurbulence noise at 3-4% opacity (needs
       img-src data: on the app CSP). */
    .hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
        pointer-events: none;
    }

    /* Faint architectural line grid. */
    .hero::after {
        content: "";
        position: absolute;
        inset: 0;
        background-image:
            linear-gradient(to right, color-mix(in oklab, var(--color-ink) 4%, transparent) var(--hairline), transparent var(--hairline)),
            linear-gradient(to bottom, color-mix(in oklab, var(--color-ink) 4%, transparent) var(--hairline), transparent var(--hairline));
        background-size: var(--grid-size) var(--grid-size);
        pointer-events: none;
    }

    .hero__inner {
        position: relative;
        display: grid;
        gap: var(--space-4);
        justify-items: start;
        padding-block: var(--space-section);
    }

    .hero__eyebrow {
        color: var(--color-gold-ink);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .hero__title {
        max-width: var(--measure-display);
        font-size: var(--text-display);
    }

    .hero__lead {
        max-width: var(--measure-lead);
        color: var(--color-ink-muted);
        font-size: var(--text-lg);
    }

    .search-panel {
        display: none;
        width: 100%;
        max-width: var(--measure);
        margin-top: var(--space-4);
    }

    .js .search-panel {
        display: block;
    }

    .search__label {
        display: block;
        margin-bottom: var(--space-2);
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .search {
        display: flex;
        align-items: center;
        gap: var(--space-2);
        padding: var(--space-2) var(--space-3);
        background: var(--color-surface);
        border: var(--hairline) solid var(--color-border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-1);
    }

    .search:hover {
        border-color: color-mix(in oklab, var(--color-accent) 35%, var(--color-border));
    }

    .search:focus-within {
        border-color: var(--color-accent);
        outline: var(--focus-width) solid var(--color-focus);
        outline-offset: var(--focus-offset);
    }

    .search__icon {
        flex: none;
        width: var(--icon-size);
        height: var(--icon-size);
        color: var(--color-ink-muted);
    }

    .search__input {
        flex: 1;
        min-width: 0;
        padding: var(--space-2) 0;
        background: transparent;
        border: 0;
        color: var(--color-ink);
    }

    .search__input:focus,
    .search__input:focus-visible {
        outline: none;
    }

    .search__input::placeholder {
        color: var(--color-ink-muted);
        opacity: 0.85;
    }

    .search__clear {
        flex: none;
        padding: var(--space-1) var(--space-3);
        border: var(--hairline) solid var(--color-border);
        border-radius: var(--radius-sm);
        color: var(--color-ink-muted);
        font-size: var(--text-xs);
    }

    .search__clear:hover {
        background: var(--color-surface-2);
        color: var(--color-ink);
    }

    .search__kbd {
        flex: none;
        padding: var(--space-1) var(--space-2);
        background: var(--color-surface-2);
        border: var(--hairline) solid var(--color-border);
        border-radius: var(--radius-sm);
        color: var(--color-ink-muted);
        font-size: var(--text-xs);
    }

    .search__status {
        margin-top: var(--space-2);
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
    }

    .category {
        container-type: inline-size;
    }

    .category__heading {
        display: flex;
        align-items: baseline;
        gap: var(--space-3);
        padding-top: var(--space-4);
        border-top: var(--hairline) solid var(--color-gold);
        font-size: var(--text-xl);
    }

    .category__count {
        color: var(--color-ink-muted);
        font-family: var(--font-body);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .card-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: var(--space-6);
        margin-top: var(--space-5);
    }

    @container (min-width: 560px) {
        .card-grid {
            grid-template-columns: repeat(2, minmax(0, 1fr));
        }
    }

    @container (min-width: 900px) {
        .card-grid {
            grid-template-columns: repeat(3, minmax(0, 1fr));
        }
    }

    @supports not (container-type: inline-size) {
        .card-grid {
            grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
        }
    }

    .card-grid__item {
        display: flex;
    }

    .card {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
        width: 100%;
        padding: var(--space-5);
        background: var(--color-surface);
        border: var(--hairline) solid var(--color-border);
        border-left: var(--bar-width) solid var(--card-tone, var(--color-accent));
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-1);
        color: inherit;
        text-decoration: none;
    }

    .tone-0 {
        --card-tone: var(--color-tone-1);
    }

    .tone-1 {
        --card-tone: var(--color-tone-2);
    }

    .tone-2 {
        --card-tone: var(--color-tone-3);
    }

    .tone-3 {
        --card-tone: var(--color-tone-4);
    }

    .tone-4 {
        --card-tone: var(--color-tone-5);
    }

    .tone-5 {
        --card-tone: var(--color-tone-6);
    }

    .card__category {
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .card__title {
        display: -webkit-box;
        overflow: hidden;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 3;
        font-size: var(--text-lg);
    }

    .card__summary {
        display: -webkit-box;
        overflow: hidden;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 3;
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
    }

    .card__tags {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-2);
    }

    .tag {
        display: inline-block;
        padding: var(--space-1) var(--space-3);
        background: var(--color-surface-2);
        border-radius: var(--radius-pill);
        color: var(--color-ink-muted);
        font-size: var(--text-xs);
    }

    .card__footer {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: var(--space-3);
        margin-top: auto;
        padding-top: var(--space-3);
        border-top: var(--hairline) solid var(--color-border);
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
    }

    .level-badge {
        display: inline-block;
        padding: var(--space-1) var(--space-3);
        border-radius: var(--radius-sm);
        font-size: var(--text-xs);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .level-badge--foundational {
        color: var(--color-level-foundational-ink);
        background: var(--color-level-foundational-bg);
    }

    .level-badge--intermediate {
        color: var(--color-level-intermediate-ink);
        background: var(--color-level-intermediate-bg);
    }

    .level-badge--advanced {
        color: var(--color-level-advanced-ink);
        background: var(--color-level-advanced-bg);
    }

    .level-badge--default {
        color: var(--color-ink-muted);
        background: var(--color-surface-2);
    }

    .empty-state {
        max-width: var(--measure);
        padding: var(--space-6);
        background: var(--color-surface);
        border: var(--hairline) dashed var(--color-border);
        border-radius: var(--radius-lg);
        color: var(--color-ink-muted);
    }

    .no-results {
        max-width: var(--measure);
        padding: var(--space-6);
        background: var(--color-surface);
        border: var(--hairline) dashed var(--color-border);
        border-radius: var(--radius-lg);
        color: var(--color-ink-muted);
    }

    .category__empty {
        display: none;
        margin-top: var(--space-4);
        color: var(--color-ink-muted);
        font-size: var(--text-sm);
    }

    @supports selector(:has(*)) {
        .category:not(:has(.card-grid__item:not([hidden]))) .card-grid {
            display: none;
        }

        .category:not(:has(.card-grid__item:not([hidden]))) .category__empty {
            display: block;
        }
    }

    .notice {
        display: grid;
        gap: var(--space-3);
        justify-items: start;
        max-width: var(--measure);
        padding-block: var(--space-section);
    }

    .notice__eyebrow {
        color: var(--color-gold-ink);
        font-size: var(--text-sm);
        font-variant-caps: all-small-caps;
        letter-spacing: var(--tracking-caps);
    }

    .notice__title {
        font-size: var(--text-3xl);
    }

    .notice__body {
        color: var(--color-ink-muted);
        font-size: var(--text-lg);
    }
}

@layer utilities {
    .sr-only {
        position: absolute;
        width: var(--a11y-size);
        height: var(--a11y-size);
        padding: 0;
        margin: var(--a11y-offset);
        overflow: hidden;
        clip: rect(0 0 0 0);
        clip-path: inset(50%);
        white-space: nowrap;
        border: 0;
    }

    .link-button {
        padding: 0;
        color: var(--color-accent);
        font: inherit;
        text-decoration: underline;
        text-decoration-thickness: var(--hairline);
        text-underline-offset: var(--space-1);
    }
}

/* All motion lives behind prefers-reduced-motion: no-preference, so reduced
   motion users get an instant, animation-free page. */
@media (prefers-reduced-motion: no-preference) {
    .site-header {
        transition: border-color var(--dur-fast) linear;
    }

    .card {
        transition:
            transform var(--dur-base) var(--ease-out),
            box-shadow var(--dur-base) var(--ease-out),
            border-color var(--dur-base) var(--ease-out);
        animation: rise var(--dur-slow) var(--ease-out) both;
        animation-delay: calc(var(--stagger-index, 0) * var(--stagger-step));
    }

    .card:hover {
        transform: translateY(var(--lift));
        box-shadow: var(--shadow-2);
        border-color: color-mix(in oklab, var(--color-accent) 45%, var(--color-border));
    }

    .card:active {
        transform: none;
    }

    .hero__inner {
        animation: rise var(--dur-slow) var(--ease-out) both;
    }

    .card-grid__item:nth-child(1) .card {
        --stagger-index: 0;
    }

    .card-grid__item:nth-child(2) .card {
        --stagger-index: 1;
    }

    .card-grid__item:nth-child(3) .card {
        --stagger-index: 2;
    }

    .card-grid__item:nth-child(4) .card {
        --stagger-index: 3;
    }

    .card-grid__item:nth-child(5) .card {
        --stagger-index: 4;
    }

    .card-grid__item:nth-child(6) .card {
        --stagger-index: 5;
    }

    .card-grid__item:nth-child(7) .card {
        --stagger-index: 6;
    }

    .card-grid__item:nth-child(8) .card {
        --stagger-index: 7;
    }

    @keyframes rise {
        from {
            opacity: 0;
            transform: translateY(var(--rise));
        }

        to {
            opacity: 1;
            transform: none;
        }
    }

    ::view-transition-group(*) {
        animation-duration: var(--dur-base);
        animation-timing-function: var(--ease-out);
    }
}