/* Cascade layer order — enforces specificity hierarchy across the package. */
@layer platform-ui.reset, platform-ui.tokens, platform-ui.grammar, platform-ui.primitives;


@layer platform-ui.reset {
    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }

    html {
        -webkit-text-size-adjust: 100%;
        text-size-adjust: 100%;
        tab-size: 4;
    }

    body {
        margin: 0;
        min-height: 100svh;
        line-height: 1.5;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
    }

    h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd {
        margin: 0;
    }

    img, picture, video, canvas, svg {
        display: block;
        max-width: 100%;
    }

    input, button, textarea, select {
        font: inherit;
        color: inherit;
    }

    button {
        cursor: pointer;
        background: none;
        border: none;
        padding: 0;
    }

    :where([hidden]) {
        display: none !important;
    }

    :where(:focus-visible) {
        outline: 2px solid var(--ui-focus-ring, currentColor);
        outline-offset: 2px;
    }
}


@layer platform-ui.reset {
    :root {
        --ui-font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        --ui-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

        font-family: var(--ui-font-sans);
        font-size: 16px;
        color: var(--ui-text-primary, inherit);
        background: var(--ui-surface-page, transparent);
    }

    code, kbd, samp, pre {
        font-family: var(--ui-font-mono);
        font-size: 0.9375em;
    }

    a {
        color: var(--ui-accent-brand, currentColor);
        text-decoration-skip-ink: auto;
    }
}


@layer platform-ui.grammar {
[sx-align="center"] { align-items: center; }
[sx-align="end"] { align-items: flex-end; }
[sx-align="start"] { align-items: flex-start; }
[sx-align="stretch"] { align-items: stretch; }
[sx-gap="0"] { gap: 0; }
[sx-gap="1"] { gap: 0.25rem; }
[sx-gap="2"] { gap: 0.5rem; }
[sx-gap="3"] { gap: 0.75rem; }
[sx-gap="4"] { gap: 1rem; }
[sx-gap="6"] { gap: 1.5rem; }
[sx-gap="8"] { gap: 2rem; }
[sx-justify="between"] { justify-content: space-between; }
[sx-justify="center"] { justify-content: center; }
[sx-justify="end"] { justify-content: flex-end; }
[sx-justify="start"] { justify-content: flex-start; }
[sx-layout="cluster"] { display: flex; flex-direction: row; flex-wrap: wrap; align-items: center; }
[sx-layout="frame"] { display: block; }
[sx-layout="grid"] { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); }
[sx-layout="stack"] { display: flex; flex-direction: column; }
[sx-padding="0"] { padding: 0; }
[sx-padding="1"] { padding: 0.25rem; }
[sx-padding="2"] { padding: 0.5rem; }
[sx-padding="3"] { padding: 0.75rem; }
[sx-padding="4"] { padding: 1rem; }
[sx-padding="6"] { padding: 1.5rem; }
[sx-padding="8"] { padding: 2rem; }
[sx-radius="lg"] { border-radius: var(--ui-radius-lg, 0.75rem); }
[sx-radius="md"] { border-radius: var(--ui-radius-md, 0.5rem); }
[sx-radius="none"] { border-radius: var(--ui-radius-none, 0); }
[sx-radius="pill"] { border-radius: var(--ui-radius-pill, 9999px); }
[sx-radius="sm"] { border-radius: var(--ui-radius-sm, 0.25rem); }
[sx-surface="flat"] { background: var(--ui-surface-page); color: var(--ui-text-primary); }
[sx-surface="panel"] { background: var(--ui-surface-panel); color: var(--ui-text-primary); border: 1px solid var(--ui-border-subtle); }
[sx-surface="raised"] { background: var(--ui-surface-raised); color: var(--ui-text-primary); border: 1px solid var(--ui-border-subtle); box-shadow: var(--ui-shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06)); }
[sx-tone="brand"] { color: var(--ui-accent-brand); }
[sx-tone="danger"] { color: var(--ui-state-danger); }
[sx-tone="neutral"] { color: var(--ui-text-muted); }
[sx-tone="success"] { color: var(--ui-state-success); }
[sx-tone="warning"] { color: var(--ui-state-warning); }
[ui-text="body"] { font-size: 0.9375rem; line-height: 1.5; color: var(--ui-text-primary); }
[ui-text="label"] { font-size: 0.8125rem; line-height: 1.4; font-weight: 500; color: var(--ui-text-primary); }
[ui-text="muted"] { font-size: 0.9375rem; line-height: 1.5; color: var(--ui-text-muted); }
[ui-text="title"] { font-size: 1.25rem; line-height: 1.3; font-weight: 600; color: var(--ui-text-primary); letter-spacing: -0.01em; }
}

@layer platform-ui.primitives {
    [ui="badge"] {
        display: inline-flex;
        align-items: center;
        gap: 0.25rem;
        font-size: 0.75rem;
        font-weight: 500;
        padding: 0.125rem 0.5rem;
        border-radius: var(--ui-radius-pill, 9999px);
        line-height: 1.4;
        white-space: nowrap;
    }

    [ui="badge"]:where(:not([ui-variant]), [ui-variant="solid"]) {
        background: var(--ui-accent-brand);
        color: var(--ui-text-on-accent);
    }
    [ui="badge"][ui-variant="solid"][ui-tone="neutral"] { background: var(--ui-text-muted); color: var(--ui-surface-page); }
    [ui="badge"][ui-variant="solid"][ui-tone="success"] { background: var(--ui-state-success); color: var(--ui-surface-page); }
    [ui="badge"][ui-variant="solid"][ui-tone="warning"] { background: var(--ui-state-warning); color: var(--ui-text-primary); }
    [ui="badge"][ui-variant="solid"][ui-tone="danger"] { background: var(--ui-state-danger); color: var(--ui-surface-page); }

    [ui="badge"][ui-variant="soft"] {
        background: var(--ui-surface-panel);
        color: var(--ui-accent-brand);
        border: 1px solid var(--ui-border-subtle);
    }
    [ui="badge"][ui-variant="soft"][ui-tone="neutral"] { color: var(--ui-text-muted); }
    [ui="badge"][ui-variant="soft"][ui-tone="success"] { color: var(--ui-state-success); }
    [ui="badge"][ui-variant="soft"][ui-tone="warning"] { color: var(--ui-state-warning); }
    [ui="badge"][ui-variant="soft"][ui-tone="danger"] { color: var(--ui-state-danger); }
}


@layer platform-ui.primitives {
    [ui="button"] {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        border: 1px solid transparent;
        border-radius: var(--ui-radius-md, 0.5rem);
        font: inherit;
        font-weight: 500;
        cursor: pointer;
        transition:
            background-color var(--ui-motion-duration-fast, 120ms),
            border-color     var(--ui-motion-duration-fast, 120ms),
            color            var(--ui-motion-duration-fast, 120ms),
            filter           var(--ui-motion-duration-fast, 120ms);
        white-space: nowrap;
        user-select: none;
        text-decoration: none;
    }

    [ui="button"][ui-size="sm"] { font-size: 0.8125rem; padding: 0.375rem 0.625rem; }
    [ui="button"]:where(:not([ui-size]), [ui-size="md"]) { font-size: 0.9375rem; padding: 0.5rem 0.875rem; }
    [ui="button"][ui-size="lg"] { font-size: 1rem; padding: 0.625rem 1.125rem; }

    [ui="button"]:where(:not([ui-variant]), [ui-variant="solid"]) {
        background: var(--ui-accent-brand);
        color: var(--ui-text-on-accent);
    }
    [ui="button"][ui-variant="solid"][ui-tone="neutral"] { background: var(--ui-text-primary); color: var(--ui-surface-page); }
    [ui="button"][ui-variant="solid"][ui-tone="success"] { background: var(--ui-state-success); color: var(--ui-surface-page); }
    [ui="button"][ui-variant="solid"][ui-tone="warning"] { background: var(--ui-state-warning); color: var(--ui-text-primary); }
    [ui="button"][ui-variant="solid"][ui-tone="danger"] { background: var(--ui-state-danger); color: var(--ui-surface-page); }

    [ui="button"][ui-variant="soft"] {
        background: var(--ui-surface-panel);
        color: var(--ui-text-primary);
        border-color: var(--ui-border-subtle);
    }
    [ui="button"][ui-variant="soft"][ui-tone="brand"] { color: var(--ui-accent-brand); }
    [ui="button"][ui-variant="soft"][ui-tone="success"] { color: var(--ui-state-success); }
    [ui="button"][ui-variant="soft"][ui-tone="warning"] { color: var(--ui-state-warning); }
    [ui="button"][ui-variant="soft"][ui-tone="danger"] { color: var(--ui-state-danger); }

    [ui="button"][ui-variant="ghost"] {
        background: transparent;
        color: var(--ui-text-primary);
    }
    [ui="button"][ui-variant="ghost"][ui-tone="brand"] { color: var(--ui-accent-brand); }
    [ui="button"][ui-variant="ghost"][ui-tone="success"] { color: var(--ui-state-success); }
    [ui="button"][ui-variant="ghost"][ui-tone="warning"] { color: var(--ui-state-warning); }
    [ui="button"][ui-variant="ghost"][ui-tone="danger"] { color: var(--ui-state-danger); }
    [ui="button"][ui-variant="ghost"]:hover:not(:disabled) { background: var(--ui-surface-panel); }

    [ui="button"]:hover:not(:disabled) { filter: brightness(0.95); }
    [ui="button"]:active:not(:disabled) { transform: translateY(0.5px); }
    [ui="button"]:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
}


@layer platform-ui.primitives {
    [ui="field-shell"] {
        display: block;
    }

    [ui="field-shell"][ui-size="sm"] [ui="label"] { font-size: 0.75rem; }
    [ui="field-shell"][ui-size="lg"] [ui="label"] { font-size: 0.9375rem; }
    [ui="field-shell"][ui-size="sm"] [ui="input"] { padding: 0.375rem 0.625rem; font-size: 0.875rem; }
    [ui="field-shell"][ui-size="lg"] [ui="input"] { padding: 0.625rem 0.875rem; font-size: 1rem; }

    [ui="field-shell"][ui-state="invalid"] [ui="label"] { color: var(--ui-state-danger); }
    [ui="field-shell"][ui-state="invalid"] [ui="input"] { border-color: var(--ui-state-danger); }

    [ui="field-shell"] [ui="error-text"] {
        display: block;
        font-size: 0.75rem;
        color: var(--ui-state-danger);
        margin-top: 0.25rem;
        line-height: 1.4;
    }

    [ui="field-shell"]:not([ui-state="invalid"]) [ui="error-text"] { display: none; }
}


@layer platform-ui.primitives {
    [ui="input"] {
        display: block;
        width: 100%;
        font: inherit;
        color: var(--ui-text-primary);
        background: var(--ui-surface-raised);
        border: 1px solid var(--ui-border-subtle);
        border-radius: var(--ui-radius-md, 0.5rem);
        padding: 0.5rem 0.75rem;
        transition: border-color var(--ui-motion-duration-fast, 120ms), box-shadow var(--ui-motion-duration-fast, 120ms);
    }

    [ui="input"][ui-size="sm"] { padding: 0.375rem 0.625rem; font-size: 0.875rem; }
    [ui="input"][ui-size="lg"] { padding: 0.625rem 0.875rem; font-size: 1rem; }

    [ui="input"]::placeholder { color: var(--ui-text-muted); }

    [ui="input"]:focus {
        outline: none;
        border-color: var(--ui-accent-brand);
        box-shadow: 0 0 0 3px color-mix(in oklab, var(--ui-accent-brand) 20%, transparent);
    }

    [ui="input"][ui-state="invalid"] { border-color: var(--ui-state-danger); }
    [ui="input"][ui-state="invalid"]:focus {
        box-shadow: 0 0 0 3px color-mix(in oklab, var(--ui-state-danger) 20%, transparent);
    }

    [ui="input"]:disabled {
        background: var(--ui-surface-sunken);
        color: var(--ui-text-muted);
        cursor: not-allowed;
    }
}


@layer platform-ui.primitives {
    [ui="label"] {
        display: block;
        font-size: 0.8125rem;
        font-weight: 500;
        color: var(--ui-text-primary);
        margin-bottom: 0.25rem;
        line-height: 1.4;
    }

    [ui="label"][ui-size="sm"] { font-size: 0.75rem; }
    [ui="label"][ui-size="lg"] { font-size: 0.9375rem; }
}


@layer platform-ui.primitives {
    [ui="surface"] {
        display: block;
        background: var(--ui-surface-panel);
        color: var(--ui-text-primary);
        border: 1px solid var(--ui-border-subtle);
        border-radius: var(--ui-radius-md, 0.5rem);
        padding: 1rem;
    }
}