/* ============================================================
   Design tokens — the single source of truth for the look.
   Restyling later = edit here, nowhere else. (SPEC §6)
   ============================================================ */

:root {
  /* --- Type --------------------------------------------------- */
  /* One swappable font handle. Inter is vendored locally (base.css
     @font-face, same-origin — never a CDN). System stack is the
     graceful fallback if the font file is ever absent. */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: clamp(1.5rem, 1.2rem + 1.4vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.3rem + 2.6vw, 2.5rem);
  --text-display: clamp(2.25rem, 1.4rem + 3.6vw, 3.25rem);

  --leading-tight: 1.12;
  --leading-snug: 1.3;
  --leading-normal: 1.55;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  --tracking-tight: -0.02em;
  --tracking-snug: -0.01em;

  /* --- Spacing (4px base) ------------------------------------- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* --- Radii -------------------------------------------------- */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* --- Layout ------------------------------------------------- */
  --container: 1080px;
  --pad-inline: clamp(1.25rem, 0.5rem + 3vw, 2.5rem);

  /* --- Motion (calm; no bounce, SPEC §6) ---------------------- */
  --ease-calm: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur: 280ms;
  --dur-slow: 1000ms;

  /* --- Color: light (default) --------------------------------- */
  --color-bg: #fbfaf8;
  --color-surface: #ffffff;
  --color-surface-2: #f4f2ed;
  --color-border: #e8e4dc;
  --color-border-strong: #d9d4c9;

  --color-ink: #191c1a;
  --color-ink-2: #565b56;
  --color-ink-3: #8b9089;

  /* Single restrained accent — evergreen (growth, money, calm) */
  --color-accent: #1f6f5c;
  --color-accent-strong: #185a4b;
  --color-accent-ink: #ffffff;
  --color-accent-soft: rgba(31, 111, 92, 0.1);
  --color-accent-ring: rgba(31, 111, 92, 0.32);

  /* Chart bands */
  --band-growth: #1f6f5c;
  --band-growth-soft: rgba(31, 111, 92, 0.14);
  --band-contributed: #c9c3b6;
  --band-contributed-soft: rgba(201, 195, 182, 0.45);
  --chart-grid: #ece8e0;
  --chart-axis: #a7aca3;

  /* Categorical palette — stacked-bar segments (Category Budget). Kept here,
     not inlined in JS, so the S1 visual-identity pass can retune them in one
     place (DESIGN-REVIEW.md Protocol B: no raw colour literals outside this
     file). Theme-independent: rendered at ~0.85 opacity, legible on both. */
  --cat-1: #4e79a7;
  --cat-2: #f28e2b;
  --cat-3: #e15759;
  --cat-4: #b07aa1;
  --cat-5: #edc948;
  --cat-6: #ff9da7;
  --cat-7: #9c755f;
  --cat-8: #bab0ac;
  --cat-9: #59a14f;

  /* Goal tier colours (barista · coast · fire) */
  --tier-barista:      #c0803a;
  --tier-barista-ink:  #8a5a1e;
  --tier-barista-soft: rgba(192, 128, 58, 0.14);
  --tier-coast:        #2a8fa6;
  --tier-coast-ink:    #1f6e85;
  --tier-coast-soft:   rgba(42, 143, 166, 0.14);
  --tier-fire:         var(--color-accent);
  --tier-fire-ink:     var(--color-accent-strong);
  --tier-fire-soft:    var(--color-accent-soft);

  /* Modal backdrop */
  --color-backdrop: rgba(0, 0, 0, 0.45);

  /* Progress sentiment — calm, not alarming (SPEC-DashboardProgress §2c) */
  --color-positive:      #1a6b48;
  --color-positive-soft: rgba(26, 107, 72, 0.1);
  --color-negative:      #7c5200;
  --color-negative-soft: rgba(124, 82, 0, 0.1);

  /* Crossover marker — distinct secondary, lower weight than FIRE accent */
  --color-crossover:      #6050a8;
  --color-crossover-ink:  #4a3c8a;
  --color-crossover-soft: rgba(96, 80, 168, 0.12);

  /* Danger (delete actions, liability badges) */
  --color-danger:        #b91c1c;
  --color-danger-soft:   #fef2f2;
  --color-danger-border: #fecaca;

  /* --- Elevation (soft, quiet) -------------------------------- */
  --shadow-sm: 0 1px 2px rgba(20, 24, 20, 0.04), 0 1px 3px rgba(20, 24, 20, 0.03);
  --shadow-md: 0 4px 18px rgba(20, 24, 20, 0.06), 0 2px 6px rgba(20, 24, 20, 0.04);
  --shadow-lg: 0 18px 48px rgba(20, 24, 20, 0.1), 0 6px 16px rgba(20, 24, 20, 0.05);
}

/* --- Color: dark -------------------------------------------- */
/* Applied when: (a) user explicitly chose dark via [data-theme="dark"],
   or (b) system prefers dark and the user hasn't pinned light.        */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0e110f;
    --color-surface: #161a17;
    --color-surface-2: #1d221e;
    --color-border: #2a312b;
    --color-border-strong: #38413a;

    --color-ink: #eceeea;
    --color-ink-2: #a9afa8;
    --color-ink-3: #757b73;

    --color-accent: #3dbe9a;
    --color-accent-strong: #56ceac;
    --color-accent-ink: #06120e;
    --color-accent-soft: rgba(61, 190, 154, 0.14);
    --color-accent-ring: rgba(61, 190, 154, 0.4);

    --band-growth: #3dbe9a;
    --band-growth-soft: rgba(61, 190, 154, 0.18);
    --band-contributed: #444b44;
    --band-contributed-soft: rgba(68, 75, 68, 0.55);
    --chart-grid: #262c27;
    --chart-axis: #5d635c;

    --tier-barista:      #d6a35a;
    --tier-barista-ink:  #e6bd83;
    --tier-barista-soft: rgba(214, 163, 90, 0.18);
    --tier-coast:        #4fb0c6;
    --tier-coast-ink:    #7cc8d8;
    --tier-coast-soft:   rgba(79, 176, 198, 0.18);
    --tier-fire:         var(--color-accent);
    --tier-fire-ink:     var(--color-accent-strong);
    --tier-fire-soft:    var(--color-accent-soft);

    --color-positive:      #3dbe83;
    --color-positive-soft: rgba(61, 190, 131, 0.14);
    --color-negative:      #e8a932;
    --color-negative-soft: rgba(232, 169, 50, 0.14);

    --color-crossover:      #a090e0;
    --color-crossover-ink:  #c0b4f0;
    --color-crossover-soft: rgba(160, 144, 224, 0.18);

    --color-danger:        #f87171;
    --color-danger-soft:   rgba(248, 113, 113, 0.12);
    --color-danger-border: rgba(248, 113, 113, 0.28);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  }
}

[data-theme="dark"] {
  --color-bg: #0e110f;
  --color-surface: #161a17;
  --color-surface-2: #1d221e;
  --color-border: #2a312b;
  --color-border-strong: #38413a;

  --color-ink: #eceeea;
  --color-ink-2: #a9afa8;
  --color-ink-3: #757b73;

  --color-accent: #3dbe9a;
  --color-accent-strong: #56ceac;
  --color-accent-ink: #06120e;
  --color-accent-soft: rgba(61, 190, 154, 0.14);
  --color-accent-ring: rgba(61, 190, 154, 0.4);

  --band-growth: #3dbe9a;
  --band-growth-soft: rgba(61, 190, 154, 0.18);
  --band-contributed: #444b44;
  --band-contributed-soft: rgba(68, 75, 68, 0.55);
  --chart-grid: #262c27;
  --chart-axis: #5d635c;

  --tier-barista:      #d6a35a;
  --tier-barista-ink:  #e6bd83;
  --tier-barista-soft: rgba(214, 163, 90, 0.18);
  --tier-coast:        #4fb0c6;
  --tier-coast-ink:    #7cc8d8;
  --tier-coast-soft:   rgba(79, 176, 198, 0.18);
  --tier-fire:         var(--color-accent);
  --tier-fire-ink:     var(--color-accent-strong);
  --tier-fire-soft:    var(--color-accent-soft);

  --color-positive:      #3dbe83;
  --color-positive-soft: rgba(61, 190, 131, 0.14);
  --color-negative:      #e8a932;
  --color-negative-soft: rgba(232, 169, 50, 0.14);

  --color-crossover:      #a090e0;
  --color-crossover-ink:  #c0b4f0;
  --color-crossover-soft: rgba(160, 144, 224, 0.18);

  --color-danger:        #f87171;
  --color-danger-soft:   rgba(248, 113, 113, 0.12);
  --color-danger-border: rgba(248, 113, 113, 0.28);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
}