/* ============================================================================
 * design-system.css — THE canonical Sentiero design layer (single source of truth)
 *
 * Decisions ratified 2026-06-09 (owner, via /lab/standardize):
 *   • Accent   = TWO-PRODUCT DUO. La Voce = terracotta, La Passeggiata = gold,
 *               green = "correct". Opt a subtree in with data-product / .product-*.
 *   • Buttons  = PILL (.ds-btn, .ds-rec circular record).
 *   • Cards    = B borderless+deep (.ds-card); C accent-rule (.ds-card--rule) where it fits.
 *   • Type     = GENEROUS scale (Playfair display / Cormorant gloss / Inter body / mono kicker).
 *   • Theme    = WARM-PAPER LIGHT ALWAYS (no dark mode).
 *
 * Everything is namespaced --ds-* / .ds-* so it can be adopted incrementally
 * without clobbering the legacy tokens during migration. As each surface moves
 * onto these, its private palette + dark rules get deleted.
 * NEVER hardcode a brand hex outside this file — reference the tokens.
 * ========================================================================== */

:root {
  /* ── Brand palette (the ONLY place these hexes live) ───────────────── */
  --ds-terracotta:      #d97757;
  --ds-terracotta-deep: #b85e3f;
  --ds-gold:            #b8893b;
  --ds-gold-deep:       #8a640f;
  --ds-green:          #3d8f6c;   /* "correct / target" — the only green */
  --ds-green-soft:     rgba(61, 143, 108, 0.14);
  --ds-rose:           #b85c4a;   /* gentle "off" — never harsh red */

  /* Ink + paper (one each) */
  --ds-ink:        #241a12;
  --ds-ink-soft:   rgba(36, 26, 18, 0.64);
  --ds-ink-faint:  rgba(36, 26, 18, 0.42);
  --ds-on-accent:  #fffaf0;
  --ds-paper:      #fffdf8;
  --ds-paper-soft: rgba(250, 245, 236, 0.72);
  --ds-paper-edge: #f3ead9;
  --ds-rule:       rgba(184, 137, 59, 0.28);   /* hairline */
  --ds-rule-soft:  rgba(184, 137, 59, 0.16);

  /* ── DUO accent — resolves per product context ───────────────────────
   * Default = GOLD (La Passeggiata is the home/journey product).
   * La Voce subtrees opt into terracotta below. */
  --ds-accent:        var(--ds-gold);
  --ds-accent-deep:   var(--ds-gold-deep);
  --ds-accent-tint:   rgba(184, 137, 59, 0.12);
  --ds-accent-rgb:    184, 137, 59;

  /* ── Shadows ─────────────────────────────────────────────────────── */
  --ds-shadow-card:  0 18px 44px rgba(80, 50, 20, 0.16);     /* Card B */
  --ds-shadow-soft:  0 8px 22px rgba(80, 50, 20, 0.10);
  --ds-shadow-btn:   0 8px 20px rgba(120, 60, 30, 0.28);

  /* ── Corner rhythm (use ONLY these) ──────────────────────────────── */
  --ds-r-1: 10px;   /* small chips / inputs */
  --ds-r-2: 14px;   /* nested cards */
  --ds-r-3: 20px;   /* primary card (B) */
  --ds-r-pill: 999px;

  /* ── Spacing rhythm ──────────────────────────────────────────────── */
  --ds-s-1: 0.25rem; --ds-s-2: 0.5rem; --ds-s-3: 0.75rem;
  --ds-s-4: 1rem; --ds-s-5: 1.5rem; --ds-s-6: 2rem; --ds-s-7: 3rem;

  /* ── Typefaces (exactly three + a serif gloss) ───────────────────── */
  --ds-font-display: "Playfair Display", Georgia, serif;
  --ds-font-gloss:   "Cormorant Garamond", Georgia, serif;
  --ds-font-ui:      "Inter", system-ui, "Helvetica Neue", sans-serif;
  --ds-font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  /* ── GENEROUS type scale (owner pick) ────────────────────────────── */
  --ds-fs-hero:    2.4rem;   /* big Playfair display */
  --ds-fs-h1:      1.9rem;
  --ds-fs-h2:      1.5rem;
  --ds-fs-gloss:   1.2rem;   /* Cormorant italic translation/why line */
  --ds-fs-lg:      1.1rem;
  --ds-fs-body:    1rem;
  --ds-fs-sm:      0.88rem;
  --ds-fs-kicker:  0.62rem;  /* mono uppercase label */
  --ds-tracking-kicker: 0.16em;   /* the ONE kicker letter-spacing */

  --ds-motion: 200ms;
}

/* ── Product accent opt-in ─────────────────────────────────────────── */
[data-product="voce"], .product-voce {
  --ds-accent:      var(--ds-terracotta);
  --ds-accent-deep: var(--ds-terracotta-deep);
  --ds-accent-tint: rgba(217, 119, 87, 0.12);
  --ds-accent-rgb:  217, 119, 87;
}
[data-product="passeggiata"], .product-passeggiata {
  --ds-accent:      var(--ds-gold);
  --ds-accent-deep: var(--ds-gold-deep);
  --ds-accent-tint: rgba(184, 137, 59, 0.12);
  --ds-accent-rgb:  184, 137, 59;
}

/* ======================  TYPE HELPERS  ============================== */
.ds-kicker {
  font-family: var(--ds-font-mono);
  font-size: var(--ds-fs-kicker);
  letter-spacing: var(--ds-tracking-kicker);
  text-transform: uppercase;
  color: var(--ds-accent-deep);
  font-weight: 500;
}
.ds-hero    { font-family: var(--ds-font-display); font-weight: 700; font-size: var(--ds-fs-hero); line-height: 1.1; color: var(--ds-ink); margin: 0; }
.ds-h1      { font-family: var(--ds-font-display); font-weight: 600; font-size: var(--ds-fs-h1); line-height: 1.15; color: var(--ds-ink); margin: 0; }
.ds-h2      { font-family: var(--ds-font-display); font-weight: 600; font-size: var(--ds-fs-h2); line-height: 1.2; color: var(--ds-ink); margin: 0; }
.ds-gloss   { font-family: var(--ds-font-gloss); font-style: italic; font-size: var(--ds-fs-gloss); line-height: 1.45; color: var(--ds-ink-soft); margin: 0; }
.ds-body    { font-family: var(--ds-font-ui); font-size: var(--ds-fs-body); line-height: 1.6; color: var(--ds-ink); }
.ds-muted   { color: var(--ds-ink-soft); }

/* ======================  BUTTONS (pill)  =========================== */
.ds-btn {
  font-family: var(--ds-font-mono);
  font-size: var(--ds-fs-kicker);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 0.62rem 1.3rem;
  border-radius: var(--ds-r-pill);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--ds-motion) ease, box-shadow var(--ds-motion) ease, background var(--ds-motion) ease, color var(--ds-motion) ease;
  display: inline-flex; align-items: center; gap: 0.4rem;
  line-height: 1;
}
.ds-btn:focus-visible { outline: 2px solid var(--ds-accent); outline-offset: 2px; }
.ds-btn--primary {
  background: var(--ds-accent); color: var(--ds-on-accent);
  box-shadow: var(--ds-shadow-btn);
}
.ds-btn--primary:hover { background: var(--ds-accent-deep); transform: translateY(-1px); }
.ds-btn--ghost {
  background: transparent; color: var(--ds-accent-deep);
  border-color: var(--ds-accent);
}
.ds-btn--ghost:hover { background: var(--ds-accent-tint); }
.ds-btn--mono {
  background: transparent; color: var(--ds-ink-soft);
  border-color: rgba(120, 90, 50, 0.4);
  font-size: 0.58rem; padding: 0.5rem 1rem;
}
.ds-btn--mono:hover { color: var(--ds-ink); border-color: var(--ds-accent); }
.ds-btn:disabled { opacity: 0.5; cursor: default; box-shadow: none; transform: none; }

/* The ONE record affordance (circular). Add .is-recording for the live state. */
.ds-rec {
  width: 60px; height: 60px; border-radius: 50%;
  border: 0; cursor: pointer; display: grid; place-items: center;
  background: var(--ds-accent);
  box-shadow: 0 10px 26px rgba(var(--ds-accent-rgb), 0.42);
  transition: transform var(--ds-motion) ease, box-shadow var(--ds-motion) ease;
}
.ds-rec::before { content: ""; width: 20px; height: 20px; border-radius: 50%; background: #fff; transition: all var(--ds-motion) ease; }
.ds-rec:hover { transform: translateY(-1px); box-shadow: 0 14px 32px rgba(var(--ds-accent-rgb), 0.52); }
.ds-rec.is-recording::before { width: 18px; height: 18px; border-radius: 4px; background: #fff; }
.ds-rec--ghost { background: transparent; border: 2px solid var(--ds-accent); box-shadow: none; }
.ds-rec--ghost::before { background: var(--ds-accent); }

/* The ONE play affordance */
.ds-play {
  width: 46px; height: 46px; border-radius: 50%;
  border: 1.5px solid var(--ds-accent); background: transparent; color: var(--ds-accent-deep);
  cursor: pointer; display: grid; place-items: center;
  transition: background var(--ds-motion) ease;
}
.ds-play:hover { background: var(--ds-accent-tint); }
.ds-play::before { content: ""; border-left: 12px solid currentColor; border-top: 7px solid transparent; border-bottom: 7px solid transparent; margin-left: 3px; }

/* ======================  CARDS  ==================================== */
/* Card B — the primary primitive: borderless, deep lift, paper. */
.ds-card {
  background: var(--ds-paper);
  border: 0;
  border-radius: var(--ds-r-3);
  box-shadow: var(--ds-shadow-card);
  padding: var(--ds-s-5);
}
/* Card C — editorial accent-rule flat (use here and there for list rows / asides). */
.ds-card--rule {
  background: var(--ds-paper-soft);
  border: 0; border-left: 3px solid var(--ds-accent);
  border-radius: var(--ds-r-1);
  box-shadow: none;
  padding: var(--ds-s-4) var(--ds-s-4);
}
/* A nested / inner panel inside a card. */
.ds-panel {
  background: var(--ds-paper-soft);
  border: 1px solid var(--ds-rule-soft);
  border-radius: var(--ds-r-2);
  padding: var(--ds-s-4);
}

/* ======================  STREAK BLOOM  ============================= *
 * As a streak grows, a watercolor blooms IN from the card's edges while the
 * centre stays calm and legible (canon: painting on the borders, paper inside).
 * Drive it from JS:  card.style.setProperty('--ds-streak', Math.min(1, n/6))
 * Milestones can add .is-milestone for a brief brighten. Honors reduced-motion. */
.ds-card--bloom { position: relative; overflow: hidden; --ds-streak: 0; }
/* The watercolor PAINTING, gently leaned toward the product pigment — clay (La
 * Voce terracotta) / ochre-gold (La Passeggiata) — with an earthy `multiply`, so
 * the painting's own colours carry through. NOT a glossy colour-replacement filter.
 * Blooms in from the rim; the centre stays calm. Strength scales with the streak. */
.ds-card--bloom::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    linear-gradient(rgba(var(--ds-accent-rgb), 0.38), rgba(var(--ds-accent-rgb), 0.38)),
    url("/watercolor/2_Sargent_In-the-Luxembourg-Gardens_1879-scaled-e1747761407171-2048x1160.jpg") center / cover no-repeat;
  background-blend-mode: multiply, normal;
  -webkit-mask-image: radial-gradient(150% 125% at 50% 44%, transparent 18%, #000 82%);
          mask-image: radial-gradient(150% 125% at 50% 44%, transparent 18%, #000 82%);
  opacity: calc(var(--ds-streak, 0) * 0.95);
  transition: opacity 900ms cubic-bezier(.22,.61,.36,1);
}
.ds-card--bloom > * { position: relative; z-index: 1; }
.ds-card--bloom.is-milestone::before { animation: ds-bloom-pulse 1100ms ease; }
@keyframes ds-bloom-pulse {
  0% { opacity: calc(var(--ds-streak, 0) * 0.95); }
  45% { opacity: calc(var(--ds-streak, 0) * 0.95 + 0.14); }
  100% { opacity: calc(var(--ds-streak, 0) * 0.95); }
}
@media (prefers-reduced-motion: reduce) {
  .ds-card--bloom::before { transition: none; }
  .ds-card--bloom.is-milestone::before { animation: none; }
}

/* ======================  CHIPS / STATUS  =========================== */
.ds-chip {
  display: inline-block;
  font-family: var(--ds-font-mono); font-size: var(--ds-fs-kicker);
  letter-spacing: 0.08em; padding: 0.22rem 0.6rem; border-radius: var(--ds-r-pill);
  background: rgba(120, 90, 50, 0.12); color: var(--ds-ink-soft);
}
.ds-chip--ok   { background: var(--ds-green-soft); color: var(--ds-green); }
.ds-chip--accent { background: var(--ds-accent-tint); color: var(--ds-accent-deep); }

/* ======================  REVEAL / MEANING (terracotta family)  ===== */
/* The recognition→production "invitation" state, shared by reveal + La Voce. */
.ds-tint-accent { color: var(--ds-accent); }
.ds-rule-hairline { border-top: 1px solid var(--ds-rule); }


/* ======================  THEME SWITCHING REMOVED  ================== *
 * Light-always, one design (ratified 2026-06-09). No dark mode, no visual-theme
 * switcher — hide both controls; the app always renders the warm-paper manuscript. */
#theme-toggle,
[data-mount="visual-theme-switcher"],
.theme-switcher { display: none !important; }


/* ======================  PROGRESS BAR (decorated)  ================= *
 * Drive: el.style.setProperty('--ds-progress', 0.0..1.0). Accent-filled,
 * soft glow, a slow shimmer; a segmented variant for step counts. */
.ds-progress { position: relative; height: 10px; border-radius: var(--ds-r-pill); background: rgba(120, 90, 50, 0.14); overflow: hidden; }
.ds-progress__fill {
  position: absolute; top: 0; bottom: 0; left: 0; border-radius: var(--ds-r-pill);
  width: calc(var(--ds-progress, 0) * 100%);
  background: linear-gradient(90deg, var(--ds-accent-deep), var(--ds-accent));
  box-shadow: 0 0 12px rgba(var(--ds-accent-rgb), 0.5);
  transition: width 520ms cubic-bezier(.22,.61,.36,1);
  overflow: hidden;
}
.ds-progress__fill::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: ds-shimmer 1.9s linear infinite;
}
@keyframes ds-shimmer { from { transform: translateX(-100%); } to { transform: translateX(220%); } }
/* segmented step dots */
.ds-steps { display: inline-flex; gap: 6px; align-items: center; }
.ds-steps__dot { width: 9px; height: 9px; border-radius: 50%; background: rgba(120, 90, 50, 0.22); transition: all var(--ds-motion) ease; }
.ds-steps__dot.is-done { background: var(--ds-accent); }
.ds-steps__dot.is-current { background: var(--ds-accent); box-shadow: 0 0 0 4px var(--ds-accent-tint); }
@media (prefers-reduced-motion: reduce) { .ds-progress__fill::after { animation: none; } }

/* ======================  PERFECT / GOLDEN  ======================== *
 * A module finished flawlessly turns golden (regardless of product accent). */
.ds-perfect {
  position: relative;
  border: 1.5px solid var(--ds-gold);
  box-shadow:
    0 0 0 1px rgba(184, 137, 59, 0.35),
    0 22px 50px rgba(120, 90, 30, 0.30),
    inset 0 0 50px rgba(184, 137, 59, 0.14);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(184, 137, 59, 0.14), transparent 60%),
    var(--ds-paper);
}
.ds-perfect__badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--ds-font-mono); font-size: var(--ds-fs-kicker);
  letter-spacing: 0.18em; text-transform: uppercase; font-weight: 500;
  color: #5a4410; background: linear-gradient(180deg, #f3d98a, #d9b24e);
  padding: 0.3rem 0.8rem; border-radius: var(--ds-r-pill);
  box-shadow: 0 4px 14px rgba(184, 137, 59, 0.5);
}
.ds-perfect__badge::before { content: "\2726"; font-size: 0.8em; } /* ✦ */
@keyframes ds-perfect-in { 0% { transform: scale(.96); opacity: 0; } 60% { transform: scale(1.02); } 100% { transform: scale(1); opacity: 1; } }
.ds-perfect.is-revealed { animation: ds-perfect-in 700ms cubic-bezier(.22,.61,.36,1); }

/* ======================  MASTERY PIPS / STATE  ==================== *
 * The learner-state of a skill/word, used in the profile mastery map and
 * inline in modules. new -> glimpsed -> practicing(terracotta) -> mastered(gold). */
.ds-mastery { display: inline-flex; gap: 5px; align-items: center; }
.ds-pip { width: 9px; height: 9px; border-radius: 50%; background: rgba(120, 90, 50, 0.18); }
.ds-pip--glimpsed   { background: rgba(120, 90, 50, 0.4); }
.ds-pip--practicing { background: var(--ds-terracotta); }              /* recognises, still producing */
.ds-pip--mastered   { background: var(--ds-gold); box-shadow: 0 0 7px rgba(184, 137, 59, 0.65); }
.ds-pip--forgotten  { background: transparent; box-shadow: inset 0 0 0 1.5px rgba(184, 92, 74, 0.6); }
/* a mastered skill token */
.ds-skill { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.3rem 0.7rem; border-radius: var(--ds-r-pill); font-family: var(--ds-font-ui); font-size: var(--ds-fs-sm); background: var(--ds-paper-soft); border: 1px solid var(--ds-rule-soft); color: var(--ds-ink); }
.ds-skill--mastered { background: linear-gradient(180deg, rgba(243,217,138,.5), rgba(217,178,78,.28)); border-color: rgba(184,137,59,.5); color: #5a4410; }