/* ============================================================
   TOG Guide — design tokens & screen styles
   Ported from Claude Design handoff (sleep-tog project).
   Theme scoped via [data-theme]; warmth via [data-warmth].
   ============================================================ */

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }

body {
  background: oklch(0.168 0.008 75);
  min-height: 100dvh;
}

/* ============================================================
   Root token block — .tog is the screen root
   ============================================================ */
.tog {
  /* ---- font ---- */
  --font: "Nunito Sans", -apple-system, system-ui, sans-serif;

  /* ---- spacing (4pt scale) ---- */
  --s1: 4px;  --s2: 8px;  --s3: 12px; --s4: 16px;
  --s5: 20px; --s6: 24px; --s7: 32px; --s8: 40px;

  /* ---- radii ---- */
  --r-sm:   12px;
  --r-md:   18px;
  --r-lg:   26px;
  --r-pill: 999px;

  /* ---- warmth hue/chroma (overridden per band) ---- */
  --h: 200; --c: 0.055;

  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- warmth bands ---- */
.tog[data-warmth="cold"]     { --h: 256; --c: 0.060; }
.tog[data-warmth="cool"]     { --h: 232; --c: 0.058; }
.tog[data-warmth="mild"]     { --h: 200; --c: 0.052; }
.tog[data-warmth="moderate"] { --h: 158; --c: 0.058; }
.tog[data-warmth="warm"]     { --h: 78;  --c: 0.080; }
.tog[data-warmth="hot"]      { --h: 32;  --c: 0.115; }

/* ---- DARK theme (default) ---- */
.tog[data-theme="dark"] {
  --bg:         oklch(0.168 0.008 75);
  --bg-glow:    oklch(0.80 var(--c) var(--h) / 0.10);
  --surface:    oklch(0.222 0.009 75);
  --surface-2:  oklch(0.278 0.010 75);
  --text:       oklch(0.965 0.006 80);
  --muted:      oklch(0.735 0.010 80);
  --faint:      oklch(0.560 0.010 80);
  --hairline:   oklch(1 0 0 / 0.09);
  --accent:     oklch(0.825 var(--c) var(--h));
  --accent-ink: oklch(0.885 var(--c) var(--h));
  --chip:       oklch(0.825 var(--c) var(--h) / 0.16);
  --card:       color-mix(in oklab, oklch(0.222 0.009 75), oklch(0.80 var(--c) var(--h)) 18%);
  --card-edge:  oklch(0.82 var(--c) var(--h) / 0.24);
  --btn:        oklch(0.278 0.010 75);
  --btn-edge:   oklch(1 0 0 / 0.08);
  --track:      oklch(1 0 0 / 0.12);
  --shadow:     0 10px 34px rgba(0,0,0,0.42);
  --shadow-sm:  0 2px 10px rgba(0,0,0,0.30);
}

/* ---- LIGHT theme ---- */
.tog[data-theme="light"] {
  --bg:         oklch(0.967 0.007 85);
  --bg-glow:    oklch(0.70 var(--c) var(--h) / 0.10);
  --surface:    oklch(0.998 0.003 85);
  --surface-2:  oklch(0.935 0.008 85);
  --text:       oklch(0.305 0.012 75);
  --muted:      oklch(0.505 0.012 75);
  --faint:      oklch(0.620 0.012 75);
  --hairline:   oklch(0 0 0 / 0.08);
  --accent:     oklch(0.560 var(--c) var(--h));
  --accent-ink: oklch(0.470 calc(var(--c) * 1.1) var(--h));
  --chip:       oklch(0.620 var(--c) var(--h) / 0.16);
  --card:       color-mix(in oklab, oklch(0.998 0.003 85), oklch(0.62 var(--c) var(--h)) 15%);
  --card-edge:  oklch(0.55 var(--c) var(--h) / 0.20);
  --btn:        oklch(0.955 calc(var(--c) * 0.6) var(--h));
  --btn-edge:   oklch(0 0 0 / 0.06);
  --track:      oklch(0 0 0 / 0.10);
  --shadow:     0 8px 26px rgba(40,35,30,0.10);
  --shadow-sm:  0 2px 10px rgba(40,35,30,0.07);
}

/* ============================================================
   Screen shell
   ============================================================ */
.tog {
  position: relative;
  min-height: 100dvh;
  box-sizing: border-box;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background 0.4s ease;
}

.tog__scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  padding: max(74px, calc(env(safe-area-inset-top) + 20px)) var(--s6)
           max(40px, env(safe-area-inset-bottom));
  padding-left:  max(var(--s6), env(safe-area-inset-left));
  padding-right: max(var(--s6), env(safe-area-inset-right));
  gap: var(--s5);
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

/* warmth glow behind the hero */
.tog__glow {
  position: fixed;
  top: -8%;
  left: 50%;
  width: 130%;
  max-width: 640px;
  height: 360px;
  transform: translateX(-50%);
  background: radial-gradient(60% 70% at 50% 0%, var(--bg-glow), transparent 72%);
  pointer-events: none;
  transition: background 0.5s ease;
  z-index: 0;
}
.tog__scroll > * { position: relative; z-index: 1; }

/* ============================================================
   Header
   ============================================================ */
.tog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s1);
}
.tog__brand { display: flex; align-items: center; gap: var(--s3); }
.tog__mark {
  width: 34px; height: 34px;
  border-radius: 11px;
  display: grid; place-items: center;
  background: var(--chip);
  color: var(--accent-ink);
  flex-shrink: 0;
  transition: background 0.4s ease, color 0.4s ease;
}
.tog__wordmark {
  font-size: 17px; font-weight: 800; letter-spacing: 0.2px;
  color: var(--text); white-space: nowrap;
}
.tog__wordmark small {
  display: block; font-size: 11px; font-weight: 600; letter-spacing: 0.4px;
  color: var(--faint); margin-top: 1px;
}

/* ============================================================
   Hero — temperature control
   ============================================================ */
.tog__hero {
  display: flex; flex-direction: column;
  align-items: center; gap: var(--s4);
  padding-top: var(--s2);
}
.tog__herolabel {
  font-size: 12px; font-weight: 700; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--faint);
}
.tog__stepper {
  display: flex; align-items: center; justify-content: center;
  gap: var(--s5); width: 100%;
}

/* Stepper buttons — 66px touch targets */
.tog__step {
  width: 66px; height: 66px;
  border-radius: var(--r-pill);
  border: 1px solid var(--btn-edge);
  background: var(--btn);
  color: var(--text);
  display: grid; place-items: center;
  cursor: pointer; flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s ease, background 0.2s, opacity 0.2s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}
.tog__step svg { width: 24px; height: 24px; }
.tog__step:active { transform: scale(0.9); background: var(--surface-2); }
.tog__step:disabled { opacity: 0.4; cursor: default; }
.tog__step:disabled:active { transform: none; }

/* Temperature readout */
.tog__readout {
  display: flex; align-items: flex-start; justify-content: center;
  min-width: 150px;
}
.tog__value {
  font-size: 104px; line-height: 0.9; font-weight: 300;
  letter-spacing: -3px;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.tog__unit {
  font-size: 30px; font-weight: 500;
  color: var(--muted);
  margin-top: 12px; margin-left: 2px;
}

/* Slider */
.tog__sliderrow { width: 100%; }
.tog__slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 26px;
  background: transparent; cursor: pointer;
  margin-top: var(--s1);
}
.tog__slider::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px; background: var(--track);
}
.tog__slider::-moz-range-track {
  height: 4px; border-radius: 2px; background: var(--track);
}
.tog__slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  margin-top: -9px;
  box-shadow: var(--shadow-sm);
  transition: background 0.25s;
}
.tog__slider::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: var(--shadow-sm);
}
.tog__scalehint {
  display: flex; justify-content: space-between;
  font-size: 11px; font-weight: 600;
  color: var(--faint);
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   Recommendation card
   ============================================================ */
.tog__card {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: var(--r-lg);
  padding: var(--s6);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: var(--s4);
  transition: background 0.5s ease, border-color 0.5s ease;
}
.tog__cardtop {
  display: flex; align-items: center;
  justify-content: space-between; gap: var(--s3);
}
.tog__caption {
  font-size: 12px; font-weight: 700; letter-spacing: 1.2px;
  text-transform: uppercase; color: var(--faint);
}
.tog__rating {
  font-size: 13px; font-weight: 800; letter-spacing: 0.2px;
  color: var(--accent-ink);
  background: var(--chip);
  padding: 6px 12px; border-radius: var(--r-pill);
  transition: background 0.4s ease, color 0.4s ease;
  white-space: nowrap;
}
.tog__tog {
  font-size: 40px; font-weight: 800; letter-spacing: -1px;
  line-height: 1; color: var(--text);
  display: flex; align-items: baseline; gap: 8px;
}
.tog__tog span {
  font-size: 18px; font-weight: 700;
  color: var(--accent-ink); letter-spacing: 0.5px;
  transition: color 0.4s ease;
}
.tog__wear {
  font-size: 16.5px; line-height: 1.45;
  font-weight: 600; color: var(--text);
  text-wrap: pretty;
}
.tog__cardfoot {
  display: flex; align-items: center; gap: var(--s2);
  padding-top: var(--s3);
  border-top: 1px solid var(--hairline);
}
.tog__band {
  font-size: 13px; font-weight: 700; color: var(--muted);
  background: var(--surface); border: 1px solid var(--btn-edge);
  padding: 6px 11px; border-radius: var(--r-pill);
  font-variant-numeric: tabular-nums;
}

/* Warning variant */
.tog__card--warn { gap: var(--s3); }
.tog__warnhead {
  display: flex; align-items: center; gap: var(--s3);
  font-size: 18px; font-weight: 800; color: var(--accent-ink);
}
.tog__warnicon {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--chip); display: grid; place-items: center;
  flex-shrink: 0;
}

/* Note line */
.tog__note {
  display: flex; align-items: center; gap: var(--s2);
  font-size: 13.5px; font-weight: 600; color: var(--muted);
  padding: 0 var(--s1);
}
.tog__notedot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
  transition: background 0.4s ease;
}

/* ============================================================
   Safety (collapsible)
   ============================================================ */
.tog__safety {
  background: var(--surface);
  border: 1px solid var(--btn-edge);
  border-radius: var(--r-md);
  overflow: hidden;
}
.tog__safetyhdr {
  display: flex; align-items: center; gap: var(--s3);
  width: 100%; padding: 15px var(--s4);
  background: none; border: none; cursor: pointer;
  font-family: var(--font); color: var(--text); text-align: left;
  -webkit-tap-highlight-color: transparent;
}
.tog__shield { color: var(--muted); display: grid; place-items: center; }
.tog__safetytitle { flex: 1; font-size: 15px; font-weight: 800; }
.tog__chev {
  color: var(--faint);
  transition: transform 0.25s ease;
  display: grid; place-items: center;
}
.tog__safety[data-open="true"] .tog__chev { transform: rotate(180deg); }
.tog__safetybody {
  max-height: 0; overflow: hidden;
  transition: max-height 0.32s ease;
}
.tog__safety[data-open="true"] .tog__safetybody { max-height: 360px; }
.tog__safetylist {
  list-style: none;
  padding: 0 var(--s4) var(--s4);
  display: flex; flex-direction: column; gap: var(--s3);
}
.tog__safetylist li {
  display: flex; gap: var(--s3); align-items: flex-start;
  font-size: 14px; line-height: 1.4; font-weight: 600; color: var(--muted);
}
.tog__tick {
  width: 18px; height: 18px; border-radius: 50%;
  flex-shrink: 0; margin-top: 1px;
  background: var(--chip); color: var(--accent-ink);
  display: grid; place-items: center;
  transition: background 0.4s ease, color 0.4s ease;
}

/* Reference footnote */
.tog__ref {
  text-align: center; font-size: 12px; font-weight: 600;
  color: var(--faint); letter-spacing: 0.1px;
  padding-top: var(--s3); margin-top: auto;
}