/* Design tokens (DESIGN_SYSTEM › Design Tokens, T-146): primitives, then semantic roles. The only
   file with raw colours; components use semantic tokens. */

:root {
    color-scheme: light;

    --color-white: #ffffff;
    --color-mist-50: #fbfcfe;
    --color-mist-100: #f6f9fd;
    --color-mist-150: #f6f8fc;
    --color-mist-200: #e8eef7;
    --color-mist-250: #e7ecf4;
    --color-mist-300: #e3e8f0;
    --color-mist-350: #dfe5ee;
    --color-mist-400: #e6e9ee;
    --color-mist-450: #d3dbe7;
    --color-navy-900: #0b1638;
    --color-navy-800: #1d2a4d;
    --color-slate-700: #4a5677;
    --color-slate-600: #4f5b78;
    --color-slate-500: #5b6680;
    --color-slate-400: #7b879e;
    --color-blue-50: #f5f9ff;
    --color-blue-75: #eef4fd;
    --color-blue-100: #e9f1fd;
    --color-blue-110: #e8f1fd;
    --color-blue-125: #eaf2fd;
    --color-blue-150: #e6effc;
    --color-blue-200: #d6e5fb;
    --color-blue-250: #cfe0fa;
    --color-blue-300: #eef3fb;
    --color-blue-400: #7fb0f3;
    --color-blue-500: #2470de;
    --color-blue-600: #1662d4;
    --color-blue-650: #1d6be0;
    --color-blue-700: #0f55c0;
    --color-blue-750: #1253b8;
    --color-blue-800: #0f4fb0;
    --color-red-75: #fdebee;
    --color-red-100: #fde8eb;
    --color-red-400: #ef3a4f;
    --color-red-700: #c8102a;
    --color-red-800: #a30d22;
    --color-amber-75: #fef3e2;
    --color-amber-100: #fdf3e1;
    --color-amber-350: #f5a524;
    --color-amber-400: #f39a12;
    --color-amber-700: #985a0a;
    --color-sun-300: #f9c22e;
    --color-sun-400: #f6b70f;
    --color-green-75: #e4f7ef;
    --color-green-100: #e1f5ec;
    --color-green-500: #0f9a6b;
    --color-green-700: #0b7a55;
    --color-violet-100: #efe8fd;
    --color-violet-400: #9a6cf0;
    --color-violet-600: #7c4fe0;

    --color-bg-page: var(--color-mist-100);
    --color-bg-glow: radial-gradient(1200px 500px at 70% -10%, var(--color-blue-125) 0%, rgb(234 242 253 / 0) 70%);
    --color-bg-sidebar: var(--color-mist-50);
    --color-bg-bottom-bar: rgb(251 252 254 / 0.96);
    --color-bg-surface: var(--color-white);
    --color-bg-field: var(--color-white);
    --color-bg-inset: var(--color-mist-150);
    --color-bg-panel: var(--color-blue-100);
    --color-bg-current: var(--color-blue-150);
    --color-bg-hover-quiet: var(--color-blue-75);
    --color-bg-hover-secondary: var(--color-blue-50);
    --color-text-primary: var(--color-navy-900);
    --color-text-strong: var(--color-navy-800);
    --color-text-secondary: var(--color-slate-600);
    --color-text-eyebrow: var(--color-slate-700);
    --color-text-tertiary: var(--color-slate-500);
    --color-text-inverse: var(--color-white);
    --color-text-link: var(--color-blue-600);
    --color-text-link-hover: var(--color-blue-800);
    --color-text-current: var(--color-blue-600);
    --color-text-tonal: var(--color-blue-750);
    --color-text-danger: var(--color-red-700);
    --color-text-danger-hover: var(--color-red-800);
    --color-nav-dimmed: var(--color-slate-600);
    --color-border-card: var(--color-mist-200);
    --color-border-sidebar: var(--color-mist-250);
    --color-border-divider: var(--color-mist-300);
    --color-border-tabs: var(--color-mist-350);
    --color-border-dashed: var(--color-mist-450);
    --color-border-control: var(--color-slate-400);
    --color-border-control-hover: var(--color-blue-600);
    --color-border-selected: var(--color-blue-600);
    --color-border-invalid: var(--color-red-700);
    --color-action-primary-bg: linear-gradient(180deg, var(--color-blue-500), var(--color-blue-700));
    --color-action-primary-bg-active: var(--color-blue-700);
    --color-action-primary-text: var(--color-white);
    --color-action-secondary-bg: var(--color-white);
    --color-action-secondary-bg-hover: var(--color-blue-50);
    --color-action-secondary-bg-active: var(--color-blue-150);
    --color-action-secondary-border: var(--color-slate-400);
    --color-action-secondary-border-hover: var(--color-blue-600);
    --color-action-secondary-text: var(--color-navy-900);
    --color-action-tonal-bg: var(--color-blue-150);
    --color-action-tonal-bg-hover: var(--color-blue-200);
    --color-action-tonal-text: var(--color-blue-750);
    --color-action-quiet-text: var(--color-blue-600);
    --color-action-quiet-bg-hover: var(--color-blue-75);
    --color-action-danger-bg: var(--color-red-700);
    --color-action-danger-bg-hover: var(--color-red-800);
    --color-action-danger-text: var(--color-white);
    --color-focus-ring: var(--color-blue-600);
    --color-input-halo: rgb(22 98 212 / 0.12);
    --color-selection-bg: var(--color-blue-250);
    --color-selection-text: var(--color-navy-900);
    --color-feedback-success-text: var(--color-green-700);
    --color-feedback-success-icon: var(--color-green-500);
    --color-feedback-success-border: var(--color-green-700);
    --color-feedback-success-bg: var(--color-green-100);
    --color-feedback-warning-text: var(--color-amber-700);
    --color-feedback-warning-icon: var(--color-amber-700);
    --color-feedback-warning-border: var(--color-amber-700);
    --color-feedback-warning-bg: var(--color-amber-100);
    --color-feedback-error-text: var(--color-red-700);
    --color-feedback-error-icon: var(--color-red-700);
    --color-feedback-error-border: var(--color-red-700);
    --color-feedback-error-bg: var(--color-red-100);
    --color-feedback-info-text: var(--color-blue-600);
    --color-feedback-info-icon: var(--color-blue-600);
    --color-feedback-info-border: var(--color-blue-600);
    --color-feedback-info-bg: var(--color-blue-110);
    --color-badge-due-text: var(--color-red-700);
    --color-badge-due-bg: var(--color-red-100);
    --color-badge-solid-bg: var(--color-red-700);
    --color-chip-status-text: var(--color-blue-600);
    --color-chip-status-bg: var(--color-blue-110);
    --color-chip-due-text: var(--color-red-700);
    --color-chip-due-bg: var(--color-red-75);
    --color-chip-category-text: var(--color-amber-700);
    --color-chip-category-bg: var(--color-amber-100);
    --color-bar-track: var(--color-mist-400);
    --color-bar-fill: var(--color-blue-600);
    --color-bar-fill-done: var(--color-green-700);
    --color-heat-0: var(--color-blue-300);
    --color-heat-1: var(--color-blue-250);
    --color-heat-2: var(--color-blue-400);
    --color-heat-3: var(--color-blue-600);
    --color-recording: var(--color-red-700);
    --color-meter: var(--color-blue-600);
    --color-disabled-bg: var(--color-mist-150);
    --color-disabled-text: var(--color-slate-500);
    --color-disabled-border: var(--color-slate-400);
    --color-tile-blue-bg: var(--color-blue-100);
    --color-tile-blue-icon: var(--color-blue-650);
    --color-tile-red-bg: var(--color-red-100);
    --color-tile-red-icon: var(--color-red-400);
    --color-tile-green-bg: var(--color-green-75);
    --color-tile-green-icon: var(--color-green-500);
    --color-tile-violet-bg: var(--color-violet-100);
    --color-tile-violet-icon: var(--color-violet-600);
    --color-tile-amber-bg: var(--color-amber-75);
    --color-tile-amber-icon: var(--color-amber-400);
    --color-icon-plan: var(--color-amber-350);
    --color-icon-sun-stroke: var(--color-sun-400);
    --color-icon-sun-fill: var(--color-sun-300);

    --font-family-base: "Inter", "Inter Fallback", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-fallback-metric: "Inter Fallback";
    --font-feature-default: "cv05" 1;
    --font-numeric-tabular: tabular-nums;
    --font-weight-regular: 400;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-heavy: 800;
    --font-size-12: 0.75rem;
    --font-size-14: 0.875rem;
    --font-size-15: 0.9375rem;
    --font-size-16: 1rem;
    --font-size-17: 1.0625rem;
    --font-size-18: 1.125rem;
    --font-size-19: 1.1875rem;
    --font-size-20: 1.25rem;
    --font-size-21: 1.3125rem;
    --font-size-22: 1.375rem;
    --font-size-24: 1.5rem;
    --font-size-28: 1.75rem;
    --font-size-30: 1.875rem;
    --font-size-36: 2.25rem;
    --font-size-lead: clamp(1.0625rem, calc(1.8vw + 1rem - 16px), 1.375rem);
    --font-size-h1: clamp(2.25rem, calc(5vw + 1rem - 16px), 3.375rem);
    --font-size-h1-speak: clamp(2.25rem, calc(5vw + 1rem - 16px), 3.625rem);
    --font-size-h1-section: clamp(2.25rem, calc(4.6vw + 1rem - 16px), 3.125rem);
    --font-size-h1-page: clamp(1.875rem, calc(4vw + 1rem - 16px), 2.75rem);
    --font-size-h2: clamp(1.625rem, calc(2.6vw + 1rem - 16px), 2rem);
    --font-size-card-speak: clamp(1.5rem, calc(2.6vw + 1rem - 16px), 1.875rem);
    --font-size-card-settings: clamp(1.375rem, calc(2.2vw + 1rem - 16px), 1.625rem);
    --font-size-prompt: clamp(2.25rem, calc(5vw + 1rem - 16px), 3rem);
    --font-size-prompt-long: clamp(1.625rem, calc(3.4vw + 1rem - 16px), 2.125rem);
    --font-size-answer: clamp(1.75rem, calc(3.4vw + 1rem - 16px), 2.125rem);
    --font-size-example: clamp(1.125rem, calc(2vw + 1rem - 16px), 1.375rem);
    --font-size-cta-speak: clamp(1.0625rem, calc(1.8vw + 1rem - 16px), 1.3125rem);
    --line-height-display: 1.05;
    --line-height-prompt: 1.1;
    --line-height-heading: 1.15;
    --line-height-label: 1.3;
    --line-height-meta: 1.45;
    --line-height-body: 1.55;
    --line-height-reading: 1.6;
    --letter-spacing-display: -0.035em;
    --letter-spacing-heading: -0.03em;
    --letter-spacing-title: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-eyebrow: 0.12em;

    --space-0: 0;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-7: 1.75rem;
    --space-8: 2rem;
    --space-9: 2.5rem;
    --space-10: 3rem;
    --space-11: 4rem;
    --space-12: 6rem;
    --space-page-inline: 1rem;
    --space-page-block: 1rem;
    --space-stack: var(--space-5);
    --space-section: var(--space-6);
    --space-sheet-block: clamp(1.375rem, 4vw, 1.875rem);
    --space-sheet-inline: clamp(1.25rem, 6vw, 3.125rem);

    --size-target-min: 2.75rem;
    --size-control-sm: 2.75rem;
    --size-control-md: 3.125rem;
    --size-input: 3rem;
    --size-control-lg: 3.5rem;
    --size-control-answer: 3.8125rem;
    --size-control-tonal: 3.625rem;
    --size-control-xl: 4.375rem;
    --size-record: 4.5rem;
    --size-nav-item: 3.25rem;
    --size-icon-nav: 1.5rem;
    --size-icon-tile: 1.625rem;
    --size-icon-control: 1.25rem;
    --size-icon-field: 1rem;
    --size-icon-eyebrow: 1.375rem;
    --size-tile: 3.25rem;
    --size-tile-row: 3rem;
    --size-tile-stat: 4.125rem;
    --size-tile-topic-w: 5.5rem;
    --size-tile-topic-h: 5.375rem;
    --size-mic-circle: 7.375rem;
    --size-checkbox: 1.375rem;
    --size-sidebar-md: 13.5rem;
    --size-sidebar-lg: 16rem;
    --size-logo-w: 2rem;
    --size-logo-h: 1.6875rem;
    --size-content-max: 71.875rem;
    --size-sheet-max: 52.8125rem;
    --size-form-max: 40rem;
    --size-system-max: 35rem;
    --size-signin-max: 25rem;
    --size-plan-bar-max: 21.5rem;
    --size-bar-height: 0.5625rem;
    --size-bar-height-sm: 0.375rem;
    --size-hero-w: clamp(22.5rem, 40vw, 32.5rem);
    --size-hero-library-w: 20.625rem;
    --size-hero-max-h: 15rem;
    --size-speak-chat-w: 13.75rem;
    --size-measure: 66ch;
    --size-measure-body: 70ch;
    --size-phrases-col: 18rem;
    --size-picker-max: 20rem;
    --size-textarea-min: 7.5rem;
    --size-heat-cell-min: 0.5rem;
    --size-recording-dot: 0.625rem;
    --size-meter-bars: 5;
    --size-meter-bar-width: 4px;
    --size-meter-bar-height: 24px;
    --size-meter-gap: 3px;
    --size-slot-player: 3.5rem;
    --size-slot-recorder: 8.5rem;
    --size-bottom-bar: calc(4rem + env(safe-area-inset-bottom, 0px));

    --radius-sheet: 18px;
    --radius-card: 16px;
    --radius-tile: 14px;
    --radius-row: 12px;
    --radius-button-lg: 10px;
    --radius-button: 9px;
    --radius-input: 8px;
    --radius-small: 6px;
    --radius-heat: 3px;
    --radius-pill: 999px;
    --radius-round: 50%;

    --border-width-hairline: 1px;
    --border-width-control: 1.5px;
    --border-width-selected: 2px;
    --border-width-current: 3px;
    --border-width-note: 4px;

    --shadow-none: none;
    --shadow-row: 0 1px 6px rgb(28 60 120 / 0.04);
    --shadow-card: 0 2px 12px rgb(28 60 120 / 0.05);
    --shadow-row-hover: 0 6px 20px rgb(28 60 120 / 0.08);
    --shadow-card-hover: 0 8px 24px rgb(28 60 120 / 0.09);
    --shadow-sheet: 0 10px 40px rgb(28 60 120 / 0.07);
    --shadow-button: 0 4px 14px rgb(22 98 212 / 0.25);
    --shadow-button-lg: 0 6px 18px rgb(22 98 212 / 0.25);

    --z-base: 0;
    --z-raised: 10;
    --z-sticky: 100;
    --z-menu: 200;
    --z-skip-link: 300;

    --bp-md: 47.5em;
    --bp-lg: 68.75em;
    --bp-xl: 75em;

    --motion-duration-instant: 0ms;
    --motion-duration-press: 100ms;
    --motion-duration-hover-out: 120ms;
    --motion-duration-hover-in: 150ms;
    --motion-duration-chevron: 200ms;
    --motion-duration-reveal: 250ms;
    --motion-duration-entry: 350ms;
    --motion-duration-progress: 400ms;
    --motion-duration-pulse: 1200ms;
    --motion-ease-entry: cubic-bezier(0.25, 0.1, 0.25, 1);
    --motion-ease-enter: cubic-bezier(0.2, 0, 0, 1);
    --motion-ease-exit: cubic-bezier(0.4, 0, 1, 1);
    --motion-ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --motion-ease-linear: linear;
    --motion-distance-entry: 8px;
    --motion-distance-reveal: 4px;
    --motion-distance-lift-card: -2px;
    --motion-distance-lift: -1px;

    --opacity-hidden: 0;
    --opacity-visible: 1;
    --opacity-pulse-low: 0.35;
    --opacity-bottom-bar: 0.96;

    --focus-ring-width: 3px;
    --focus-ring-offset: 2px;
    --focus-ring-offset-inset: -5px;
    --focus-ring-color: var(--color-focus-ring);
    --focus-halo: 0 0 0 3px var(--color-input-halo);
}

@media (min-width: 47.5em) {
    :root {
        --space-page-inline: clamp(1.25rem, 4vw, 4rem);
        --space-page-block: var(--space-7);
        --space-section: var(--space-9);
        --size-logo-w: 2.25rem;
        --size-logo-h: 1.875rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    :root {
        --motion-duration-press: 0ms;
        --motion-duration-hover-out: 0ms;
        --motion-duration-hover-in: 0ms;
        --motion-duration-chevron: 0ms;
        --motion-duration-reveal: 0ms;
        --motion-duration-entry: 0ms;
        --motion-duration-progress: 0ms;
        --motion-duration-pulse: 0ms;
        --motion-distance-entry: 0px;
        --motion-distance-reveal: 0px;
        --motion-distance-lift-card: 0px;
        --motion-distance-lift: 0px;
    }
}