/*
 * Graphite — achromatic precision.
 *
 * Dieter-Rams calm for operator/console/admin surfaces. The thesis is the
 * ABSENCE of tint: every neutral in the theme is true achromatic (chroma 0),
 * from the near-white grey field to the pure-white cards to the near-black
 * ink. No blue-grey, no warm-grey, no atmosphere — just graphite on paper.
 * ONE accent, an electric azure blue (hue ~258), is spent only where the eye
 * must go: the primary action, links, selection, and the focus ring. Because
 * every other pixel is colorless, that single blue points with unusual force.
 *
 * Dark mode is true dark GREY — not blue-black, not near-black drama. A
 * charcoal field (L 0.19, chroma 0) with cards stepping visibly lighter
 * (≥0.05 L) so altitude reads without shadows doing the work. The same azure
 * carries the pointing.
 *
 * Type is Inter for both body and headings — headings differentiate through
 * weight (600) and tight tracking, never through a second family. IBM Plex
 * Mono for code. Dense/pro register: body 0.9375rem, labels 0.8125rem —
 * built for tables, logs, and columns of numbers (tabular-nums is wired in).
 * Radius is a compact 0.5rem; motion is product-fast (120/200/300ms) with
 * springs aliased to standard eases — personality lives in speed, not bounce.
 * Elevation is crisp and low; borders do most of the separating.
 *
 * Token contract matches lib-theme-caffe-florian/theme.css (Crema v1).
 */

/*
 * Fonts: consuming apps load Inter + IBM Plex Mono at the top of their entry
 * CSS (where @import statements are allowed), via the Google Fonts URL
 * documented in this theme's README. Embedding the @import here — or
 * smuggling the URL in a comment for a build script to lift — breaks
 * PostCSS's ordering rules, so neither is done in this file.
 */

:root {
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    /* Tailwind utility families. Distinct names so a consuming app's
     * `@theme inline` can indirect to these (--font-heading/--font-sans collide
     * with Tailwind's own font-* namespace). Mirror --font-heading/--font-sans. */
    --heading-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --body-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    /* ── Colors ── true achromatic neutrals (chroma 0 everywhere), pure white
     * cards, near-black ink, one electric azure accent. */
    --background: oklch(0.97 0 0);
    --foreground: oklch(0.2 0 0);

    --card: oklch(1 0 0);
    --card-foreground: oklch(0.2 0 0);

    --popover: oklch(1 0 0);
    --popover-foreground: oklch(0.2 0 0);

    /* Primary — the sole color. Electric azure deep enough (L 0.5) to carry
     * white labels well above the floor, saturated enough to read electric
     * against a field that has no color at all. */
    --primary: oklch(0.5 0.19 258);
    --primary-foreground: oklch(1 0 0);

    --secondary: oklch(0.94 0 0);
    --secondary-foreground: oklch(0.27 0 0);

    --muted: oklch(0.94 0 0);
    --muted-foreground: oklch(0.45 0 0);

    /* Accent — hover/selection tint: the faintest azure wash with deep azure
     * ink. The only place besides primary where chroma is allowed to live. */
    --accent: oklch(0.94 0.025 258);
    --accent-foreground: oklch(0.4 0.16 258);

    /* ── Status ── the only other hues in the theme, kept precise and
     * unambiguous: red / green / amber / cyan-blue, each hue distinct from the
     * azure primary. Destructive and info carry white on deep fills for alarm
     * legibility; success and warning carry dark ink on brighter swatches. */
    --destructive: oklch(0.55 0.21 27);
    --destructive-foreground: oklch(0.98 0.01 27);
    --success: oklch(0.6 0.14 150);
    --success-foreground: oklch(0.17 0.03 150);
    --warning: oklch(0.75 0.15 70);
    --warning-foreground: oklch(0.22 0.05 70);
    --info: oklch(0.5 0.12 230);
    --info-foreground: oklch(0.98 0.005 230);

    --border: oklch(0.2 0 0 / 0.12);
    --input: oklch(0.2 0 0 / 0.14);
    --ring: oklch(0.5 0.19 258 / 0.6);

    /* Chart palette — azure lead, then a restrained cool spectrum (teal /
     * violet / green / graphite slate). Hues spaced, adjacent-index lightness
     * varied; the greys stay achromatic, the data gets the color. */
    --chart-1: oklch(0.5 0.19 258);
    --chart-2: oklch(0.68 0.11 195);
    --chart-3: oklch(0.55 0.14 305);
    --chart-4: oklch(0.64 0.12 150);
    --chart-5: oklch(0.42 0 0);

    --sidebar: oklch(0.955 0 0);
    --sidebar-foreground: oklch(0.2 0 0);
    --sidebar-primary: oklch(0.5 0.19 258);
    --sidebar-primary-foreground: oklch(1 0 0);
    --sidebar-accent: oklch(0.94 0.025 258);
    --sidebar-accent-foreground: oklch(0.4 0.16 258);
    --sidebar-border: oklch(0.2 0 0 / 0.1);
    --sidebar-ring: oklch(0.5 0.19 258 / 0.6);

    /* Syntax — muted-precise. Low-chroma cool hues that read as annotation,
     * not decoration; comments recede to achromatic grey. */
    --syntax-keyword: oklch(0.45 0.13 290);
    --syntax-string: oklch(0.47 0.1 150);
    --syntax-number: oklch(0.5 0.11 70);
    --syntax-comment: oklch(0.55 0 0);
    --syntax-function: oklch(0.47 0.15 258);
    --syntax-type: oklch(0.48 0.09 220);

    /* ── Chat surfaces ──
     * Contract for lib-chat-ui / lib-agent-ui / lib-agent-dock-ui. User bubble
     * is a deep graphite panel with light text (neutral, so the azure stays
     * scarce); assistant bubble is a clean white card with a hairline border. */
    --chat-user-bg: oklch(0.25 0 0);
    --chat-user-fg: oklch(0.97 0 0);
    --chat-assistant-bg: oklch(1 0 0);
    --chat-assistant-fg: oklch(0.2 0 0);
    --chat-assistant-border: oklch(0.2 0 0 / 0.12);

    /* Compact, precise radius. */
    --radius: 0.5rem;

    /* ── Motion ── product-fast. Springs alias to the standard eases so the
     * theme stays calm — personality lives in the speed, never in bounce. */
    --duration-fast: 120ms;
    --duration-base: 200ms;
    --duration-slow: 300ms;
    --duration-slower: 420ms;
    --duration-spring: 200ms;

    --ease-standard: cubic-bezier(0.2, 0, 0, 1);
    --ease-decelerate: cubic-bezier(0, 0, 0, 1);
    --ease-accelerate: cubic-bezier(0.3, 0, 1, 1);
    --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);

    --ease-spring-gentle: var(--ease-standard);
    --ease-spring-snappy: var(--ease-decelerate);
    --ease-spring-bouncy: var(--ease-standard);

    /* ── Typography ── dense/pro register, fixed rem, full role ramp. */
    --text-hero-size: 3rem;
    --text-hero-lh: 1.05;
    --text-display-size: 2.25rem;
    --text-display-lh: 1.1;
    --text-headline-size: 1.625rem;
    --text-headline-lh: 1.25;
    --text-title-size: 1.25rem;
    --text-title-lh: 1.3;
    --text-subtitle-size: 1.0625rem;
    --text-subtitle-lh: 1.45;
    --text-body-size: 0.9375rem;
    --text-body-lh: 1.5;
    --text-label-size: 0.8125rem;
    --text-label-lh: 1.125rem;
    --text-caption-size: 0.75rem;
    --text-caption-lh: 1rem;

    /* ── Elevation ── crisp, low, pure-neutral shadows. Borders separate;
     * shadows only signal altitude. */
    --elevation-0: none;
    --elevation-1: 0 1px 2px oklch(0 0 0 / 0.05);
    --elevation-2: 0 1px 3px oklch(0 0 0 / 0.07), 0 1px 2px oklch(0 0 0 / 0.04);
    --elevation-3: 0 4px 8px -2px oklch(0 0 0 / 0.08), 0 2px 4px -2px oklch(0 0 0 / 0.04);
    --elevation-4: 0 10px 20px -5px oklch(0 0 0 / 0.1), 0 4px 8px -4px oklch(0 0 0 / 0.05);
    --elevation-5: 0 18px 36px -8px oklch(0 0 0 / 0.15);

    --spacing: 0.25rem;

    --border-width-thin: 0.5px;
    --border-width-base: 1px;
    --border-width-thick: 2px;
    --border-width-heavy: 4px;

    /* No glass — inert values so consuming apps referencing these get no-ops. */
    --glass-blur: 0px;
    --glass-saturate: 100%;
    --glass-brightness: 1;
    --glass-contrast: 1;
}

/*
 * Dark mode — true dark grey, not blue-black. Charcoal field (chroma 0),
 * cards stepping visibly lighter (bg 0.19 → card 0.24 → popover 0.26 →
 * muted 0.28) so altitude reads as lightness. The azure brightens a step to
 * keep its pop; everything else stays colorless.
 */
.dark {
    --background: oklch(0.19 0 0);
    --foreground: oklch(0.93 0 0);

    --card: oklch(0.24 0 0);
    --card-foreground: oklch(0.93 0 0);

    --popover: oklch(0.26 0 0);
    --popover-foreground: oklch(0.93 0 0);

    --primary: oklch(0.55 0.19 258);
    --primary-foreground: oklch(1 0 0);

    --secondary: oklch(0.28 0 0);
    --secondary-foreground: oklch(0.9 0 0);

    --muted: oklch(0.28 0 0);
    --muted-foreground: oklch(0.72 0 0);

    --accent: oklch(0.3 0.05 258);
    --accent-foreground: oklch(0.85 0.08 258);

    --destructive: oklch(0.56 0.21 27);
    --destructive-foreground: oklch(0.98 0.01 27);
    --success: oklch(0.7 0.15 150);
    --success-foreground: oklch(0.17 0.03 150);
    --warning: oklch(0.78 0.14 70);
    --warning-foreground: oklch(0.22 0.05 70);
    --info: oklch(0.68 0.12 230);
    --info-foreground: oklch(0.16 0.03 230);

    --border: oklch(0.93 0 0 / 0.12);
    --input: oklch(0.93 0 0 / 0.14);
    --ring: oklch(0.62 0.17 258 / 0.6);

    --chart-1: oklch(0.62 0.17 258);
    --chart-2: oklch(0.74 0.11 195);
    --chart-3: oklch(0.66 0.14 305);
    --chart-4: oklch(0.72 0.13 150);
    --chart-5: oklch(0.68 0 0);

    --sidebar: oklch(0.21 0 0);
    --sidebar-foreground: oklch(0.93 0 0);
    --sidebar-primary: oklch(0.55 0.19 258);
    --sidebar-primary-foreground: oklch(1 0 0);
    --sidebar-accent: oklch(0.3 0.05 258);
    --sidebar-accent-foreground: oklch(0.85 0.08 258);
    --sidebar-border: oklch(0.93 0 0 / 0.09);
    --sidebar-ring: oklch(0.62 0.17 258 / 0.6);

    --syntax-keyword: oklch(0.72 0.12 290);
    --syntax-string: oklch(0.74 0.11 150);
    --syntax-number: oklch(0.78 0.12 70);
    --syntax-comment: oklch(0.6 0 0);
    --syntax-function: oklch(0.72 0.13 258);
    --syntax-type: oklch(0.74 0.09 220);

    /* ── Chat surfaces (dark) ── */
    --chat-user-bg: oklch(0.32 0 0);
    --chat-user-fg: oklch(0.96 0 0);
    --chat-assistant-bg: oklch(0.24 0 0);
    --chat-assistant-fg: oklch(0.93 0 0);
    --chat-assistant-border: oklch(0.93 0 0 / 0.12);

    --elevation-1: 0 1px 2px oklch(0 0 0 / 0.3);
    --elevation-2: 0 1px 3px oklch(0 0 0 / 0.4), 0 1px 2px oklch(0 0 0 / 0.25);
    --elevation-3: 0 4px 8px -2px oklch(0 0 0 / 0.4), 0 2px 4px -2px oklch(0 0 0 / 0.25);
    --elevation-4: 0 10px 20px -5px oklch(0 0 0 / 0.45), 0 4px 8px -4px oklch(0 0 0 / 0.25);
    --elevation-5: 0 18px 36px -8px oklch(0 0 0 / 0.55);
}

/*
 * @layer base — Graphite's achromatic-precision philosophy.
 *
 * No glass, no gradients, no tint. One clean grotesque at two weights,
 * colorless surfaces hairline-separated, and the azure reserved for focus,
 * selection, links, and the primary action. Numbers align in columns because
 * operators read columns.
 */
@layer base {
    body {
        min-height: 100vh;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        letter-spacing: -0.006em;
        font-family: var(--font-sans);
        font-size: var(--text-body-size);
        line-height: var(--text-body-lh);
    }

    /* Headings — same family as body; hierarchy is weight + tracking. */
    h1, h2, h3, h4,
    [data-slot="card-title"],
    [data-slot="dialog-title"],
    [data-slot="sheet-title"],
    [data-slot="alert-dialog-title"] {
        font-family: var(--font-heading);
        font-weight: 600;
        letter-spacing: -0.022em;
        color: var(--foreground);
    }

    code, kbd, samp, pre,
    [data-slot="code"],
    [data-slot="code-block"] {
        font-family: var(--font-mono);
    }

    /* Inline code — achromatic chip, never accent-colored. */
    :not(pre) > code {
        padding: 0.1em 0.35em;
        border-radius: calc(var(--radius) * 0.5);
        background: color-mix(in oklch, var(--foreground) 6%, transparent);
        color: var(--foreground);
        font-size: 0.9em;
    }

    /* Selection — the azure moment. */
    ::selection {
        background: color-mix(in oklch, var(--primary) 30%, transparent);
        color: var(--foreground);
    }

    /* Links — azure, underline-on-hover. */
    a {
        color: color-mix(in oklch, var(--primary) 70%, var(--foreground));
        text-decoration-color: color-mix(in oklch, var(--primary) 40%, transparent);
        text-underline-offset: 0.2em;
        transition: text-decoration-color var(--duration-fast) var(--ease-standard);
    }
    a:hover {
        text-decoration-color: var(--primary);
    }

    [data-slot="sidebar"] {
        background: var(--sidebar);
        border-right: var(--border-width-base) solid var(--sidebar-border);
    }

    /* Dense utility — operators read columns of numbers. Tables and anything
     * marked .num get lining, equal-width figures so columns align. */
    [data-slot="table"] {
        font-variant-numeric: tabular-nums;
    }
    .num {
        font-variant-numeric: tabular-nums;
        letter-spacing: 0;
    }
}

/*
 * Focus-visible — keyboard-first is a Graphite signature. Buttons get a
 * crisp 2px azure outline with 2px offset; inputs get a flush 1px ring plus
 * a border-color change (handled in the input block below). Placed outside
 * @layer base so it beats Tailwind's default ring utilities.
 */
[data-slot="button"]:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    box-shadow: none;
}
[data-slot="input"]:focus-visible,
[data-slot="textarea"]:focus-visible,
[data-slot="select-trigger"]:focus-visible {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
}

/* Buttons — quiet weight; opacity absorb on press, product-fast. */
[data-slot="button"] {
    font-weight: 500;
    letter-spacing: -0.006em;
}

/* Card titles — pinned to the subtitle role so the scale is the theme's
 * decision, not the card primitive's default. */
[data-slot="card-title"] {
    font-size: var(--text-subtitle-size);
    line-height: var(--text-subtitle-lh);
}

/* Touch targets — desktop keeps the dense ladder; coarse pointers get the
 * 44px floor on every control. */
@media (pointer: coarse) {
    [data-slot="button"] {
        min-height: 2.75rem;
        min-width: 2.75rem;
    }
    [data-slot="input"],
    [data-slot="select-trigger"] {
        min-height: 2.75rem;
    }
}
[data-slot="button"]:hover:not(:disabled) {
    opacity: 0.9;
}
[data-slot="button"]:active:not(:disabled) {
    opacity: 0.82;
    transform: scale(0.99);
}

/* Inputs — white card surface, hairline border, azure focus as a flush ring. */
[data-slot="input"],
[data-slot="textarea"],
[data-slot="select-trigger"] {
    background: var(--card);
    border: var(--border-width-base) solid var(--border);
    border-radius: var(--radius);
    color: var(--foreground);
    transition:
        border-color var(--duration-fast) var(--ease-standard),
        box-shadow var(--duration-fast) var(--ease-standard);
}
[data-slot="input"]::placeholder,
[data-slot="textarea"]::placeholder {
    color: var(--muted-foreground);
    opacity: 0.8;
}
[data-slot="input"]:hover:not(:disabled),
[data-slot="textarea"]:hover:not(:disabled),
[data-slot="select-trigger"]:hover:not(:disabled) {
    border-color: color-mix(in oklch, var(--foreground) 24%, transparent);
}
[data-slot="input"]:focus,
[data-slot="textarea"]:focus,
[data-slot="select-trigger"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
    outline: none;
}