/* ============================================================
   AskBack v7 — "Playful" study design
   Rounded Nunito type, vibrant energy palette, 3D pressy buttons,
   bento cards. Light-first, dark kept.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,400..1000&display=swap');

:root {
  /* Android system-bar insets (injected by the APK shell; 0 in browsers) */
  --sa-top: 0px;
  --sa-bottom: 0px;
  --sa-left: 0px;
  --sa-right: 0px;
  /* palette — light ("blush paper + flamingo") — uniquely AskBack */
  --bg: #fffbfd;
  --card: #fdf2f6;
  --card-2: #fae9f0;
  --ink: #2b1e26;
  --muted: #6f5d68;
  --faint: #a895a0;
  --hairline: #f0dde5;

  --primary: #ff4b9e;          /* flamingo pink — our signature */
  --primary-deep: #e6307c;      /* the 3D lip */
  --primary-soft: #ffdcec;
  --on-primary: #ffffff;

  --blue: #5b9dff;  --blue-deep: #3d7edb;  --blue-soft: #deeaff;   /* cornflower */
  --yellow: #ffaa33; --yellow-deep: #d98a1f; --yellow-soft: #fff1d6; /* mango */
  --coral: #ffd24d; --coral-deep: #d9a616; --coral-soft: #fff7db;  /* sunbeam */
  --red: #ff5347;   --red-deep: #d63f35;   --red-soft: #ffe1de;    /* berry */
  --purple: #c46be8; --purple-deep: #9c4fc4; --purple-soft: #f3e3fc; /* orchid */
  --green: #2ecf7f;  --green-deep: #1fa862; --green-soft: #d9f6e8; /* fresh leaf (kept distinct from pink) */

  /* semantic aliases (old names) */
  --accent: var(--primary);
  --accent-ink: #ffffff;
  --accent-soft: var(--primary-soft);
  --accent-deep: var(--primary-deep);
  --good: var(--primary);
  --good-soft: var(--primary-soft);
  --again: var(--red);
  --again-soft: var(--red-soft);
  --raise: var(--card);
  --line: var(--hairline);
  --line-strong: #e9cdd9;
  --shadow: 0 2px 0 var(--hairline);
  --surface: var(--bg);
  --surface-container: var(--card);
  --surface-container-low: var(--bg);
  --surface-container-high: var(--card-2);
  --surface-container-highest: #f5dde8;
  --surface-container-lowest: var(--bg);
  --on-surface: var(--ink);
  --on-surface-variant: var(--muted);
  --outline: #b19aa8;
  --outline-variant: var(--hairline);
  --inverse-surface: #3d1030;
  --inverse-on-surface: #ffffff;
  --primary-container: var(--blue-soft);
  --on-primary-container: var(--blue);
  --secondary-container: var(--card-2);
  --on-secondary-container: var(--ink);
  --on-error: #ffffff;
  --error: var(--red);
  --error-container: var(--red-soft);
  --on-error-container: #b32d2d;

  /* type */
  --font: "Nunito", system-ui, sans-serif;
  --serif: var(--font);
  --display: var(--font);
  --mono: "Nunito", system-ui, sans-serif;

  --fs-l: 20px;
  --fs-b: 16px;
  --fs-s: 14px;
  --fs-xs: 12px;

  --r-card: 16px;
  --r-btn: 16px;
  --w: 680px;

  --ease: cubic-bezier(.2, 0, 0, 1);
  --bounce: cubic-bezier(.34, 1.56, .64, 1);
}

[data-theme="dark"] {
  /* "midnight rose" — deep plum, pink glows */
  --bg: #1c1118;
  --card: #251a22;
  --card-2: #30222c;
  --ink: #f6edf2;
  --muted: #b39aab;
  --faint: #6d5a66;
  --hairline: #3a2a34;

  --primary: #ff4b9e;
  --primary-deep: #d63982;
  --primary-soft: #3d1226;
  --on-primary: #2b0a1c;

  --blue: #6baffe; --blue-deep: #3d7edb; --blue-soft: #14263d;
  --yellow: #ffc04d; --yellow-deep: #d98a1f; --yellow-soft: #33290d;
  --coral: #ffd24d; --coral-deep: #d9a616; --coral-soft: #332d0d;
  --red: #ff6f64; --red-deep: #d63f35; --red-soft: #3a1a18;
  --purple: #d38cff; --purple-deep: #9c4fc4; --purple-soft: #2c1a38;
  --green: #3dd98b; --green-deep: #1fa862; --green-soft: #11322a;

  --accent-soft: var(--primary-soft);
  --shadow: 0 2px 0 rgba(0,0,0,.45);
  --raise: var(--card);
  --line: var(--hairline);
  --line-strong: #4d3644;
  --surface: var(--bg);
  --surface-container: var(--card);
  --surface-container-low: var(--card);
  --surface-container-high: var(--card-2);
  --surface-container-highest: #3c2a37;
  --surface-container-lowest: #170d13;
  --on-surface: var(--ink);
  --on-surface-variant: var(--muted);
  --outline: #5c4653;
  --outline-variant: var(--hairline);
  --inverse-surface: #f6e7ef;
  --inverse-on-surface: #1c1118;
  --primary-container: var(--blue-soft);
  --on-primary-container: #a8ccff;
  --secondary-container: var(--card-2);
  --on-secondary-container: var(--ink);
  --on-error: #1c1118;
  --error: var(--red);
  --error-container: var(--red-soft);
  --on-error-container: #ffb1aa;
}

* { box-sizing: border-box; }
html { height: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--fs-b);
  font-weight: 600;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-top: var(--sa-top);
  padding-left: var(--sa-left);
  padding-right: var(--sa-right);
  padding-bottom: calc(84px + var(--sa-bottom));
  transition: background .25s var(--ease), color .25s var(--ease);
}

main { max-width: var(--w); margin: 0 auto; padding: 12px 16px 40px; }

/* ---------- motion ---------- */

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}
.pop { animation: rise .5s var(--bounce) both; animation-delay: calc(var(--i, 0) * 70ms); }

@keyframes floaty {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-9px) rotate(6deg); }
}
.bigfloat { animation: floaty 3.2s var(--ease) infinite; display: inline-block; }

@keyframes fly {
  0% { opacity: 1; transform: translate(-50%, 0) scale(1); }
  100% { opacity: 0; transform: translate(calc(-50% + var(--dx)), var(--dy)) scale(.3) rotate(var(--r)); }
}
.spark {
  position: absolute; left: 50%; top: 30px; opacity: 0; pointer-events: none;
  font-size: 17px; font-weight: 900;
  animation: fly var(--d, .9s) var(--ease) forwards;
}

/* ---------- masthead ---------- */

header.mast {
  max-width: var(--w); margin: 0 auto;
  padding: 18px 16px 2px;
  padding-top: calc(18px + var(--sa-top));
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.mast .wordmark {
  font-size: 24px; font-weight: 900; letter-spacing: -.5px;
  cursor: pointer; border: none; background: none;
  color: var(--primary); font-family: var(--font); padding: 0;
  display: inline-flex; align-items: baseline; gap: 4px;
}
.mast .wordmark .mark { color: var(--blue); font-size: 20px; }
.mast .right { display: flex; align-items: center; gap: 8px; }
.mast .theme-toggle {
  background: none; border: 2px solid transparent; border-radius: 12px;
  color: var(--faint); cursor: pointer;
  min-width: 42px; height: 42px; font-size: 18px;
  transition: transform .2s var(--ease), color .2s var(--ease);
}
.mast .theme-toggle:hover { transform: rotate(-14deg) scale(1.1); color: var(--blue); }
.mast .due-pill {
  font-size: 13px; font-weight: 900; letter-spacing: .5px;
  color: #fff; background: var(--red);
  border-bottom: 4px solid var(--red-deep);
  padding: 7px 14px; border-radius: 14px; white-space: nowrap; cursor: pointer; border-top: none; border-left: none; border-right: none;
  transition: transform .1s var(--ease);
}
.mast .due-pill:active { transform: translateY(3px); border-bottom-width: 1px; }

/* ---------- hero ---------- */

.hero { padding-top: 18px; }

.kicker {
  font-size: 13px; font-weight: 900; text-transform: uppercase;
  letter-spacing: 1.4px; color: var(--blue); margin: 0 0 12px;
}

.streak-chip {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--yellow-soft); color: var(--coral-deep);
  font-weight: 900; border-radius: 999px; padding: 4px 12px;
  font-size: 13px;
}

h1.mega { margin: 0; line-height: 1; }
.mega-n {
  display: block;
  font-size: clamp(84px, 23vw, 156px);
  line-height: .92;
  font-weight: 1000;
  color: var(--primary);
  letter-spacing: -2px;
}
.mega-rest {
  display: block;
  font-size: clamp(28px, 7vw, 42px);
  font-weight: 800;
  color: var(--ink);
  line-height: 1.1;
  margin-top: 10px;
}

h1.display {
  font-size: clamp(28px, 6.6vw, 40px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.5px;
  margin: 4px 0 12px;
}

p.lede { color: var(--muted); margin: 12px 0 22px; max-width: 48ch; font-size: 15.5px; font-weight: 600; }

.mono { font-weight: 800; }
.c-accent { color: var(--primary); }
.c-muted { color: var(--muted); }

hr.rule { border: none; border-top: 2px solid var(--hairline); margin: 24px 0; }

/* ---------- bento stat cards ---------- */

.stat-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.s-chip {
  font-size: 14px; font-weight: 800;
  padding: 10px 16px;
  border: none;
  border-radius: 14px;
  color: var(--muted);
  background: var(--card);
  box-shadow: 0 2px 0 var(--hairline);
}
.s-chip b { color: var(--ink); font-weight: 900; margin-right: 2px; }
.s-chip[data-go] { cursor: pointer; transition: transform .1s var(--ease); }
.s-chip[data-go]:active { transform: translateY(2px); box-shadow: none; }
.exam-chip { background: var(--blue-soft); color: var(--blue-deep); box-shadow: 0 2px 0 #bfe4f5; }
.exam-chip b { color: var(--blue-deep); }
.hot-n { color: var(--red); font-weight: 900; }

/* ---------- cards (bento) ---------- */

.card {
  background: var(--card);
  border: 2px solid var(--hairline);
  border-radius: var(--r-card);
  box-shadow: 0 4px 0 var(--hairline);
  padding: 20px;
  transition: transform .12s var(--ease), box-shadow .12s var(--ease);
}

.bars-card { margin-top: 22px; padding: 18px 20px 36px; }
.topics-card { margin-top: 16px; }
.topics-card .list { margin-top: 4px; }

.list { display: flex; flex-direction: column; }
.list > button.row {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  width: 100%; text-align: left;
  padding: 14px 12px;
  background: none; border: none;
  color: var(--ink); font-family: var(--font); font-size: 15px; font-weight: 700;
  cursor: pointer; border-radius: 12px;
  transition: background .15s var(--ease);
  margin-bottom: 2px;
}
.list > button.row:hover { background: var(--card-2); }
.row .row-title { font-weight: 800; font-size: 15px; }
.row .row-sub { color: var(--muted); font-size: 13px; margin-top: 1px; }
.row .row-end { font-size: 13px; color: var(--muted); text-align: right; white-space: nowrap; font-weight: 800; }

/* ---------- activity bars ---------- */

.bars { display: flex; gap: 8px; align-items: flex-end; height: 80px; margin-top: 18px; }
.bars .bar {
  flex: 1;
  background: var(--yellow-soft);
  border-radius: 8px 8px 3px 3px;
  min-height: 5px; position: relative;
  transition: background .3s var(--ease);
}
.bars .bar.hot { background: var(--yellow); box-shadow: 0 3px 0 var(--yellow-deep); }
.bars .bar em {
  position: absolute; top: -21px; left: 0; right: 0; text-align: center;
  font-style: normal; font-size: 11px; font-weight: 900; color: var(--muted);
}
.bars .bar span.day {
  position: absolute; bottom: -19px; left: 0; right: 0; text-align: center;
  font-size: 11px; font-weight: 800; color: var(--faint);
}

/* ---------- 3D press buttons (the signature) ---------- */

button { font-family: var(--font); font-size: 15px; font-weight: 800; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px;
  border-radius: var(--r-btn);
  border: none;
  background: var(--card-2);
  color: var(--ink);
  border-bottom: 4px solid var(--hairline);
  cursor: pointer;
  position: relative;
  font-weight: 800;
  transition: transform .08s var(--ease), border-bottom-width .08s var(--ease), filter .15s var(--ease);
}
.btn:hover { filter: brightness(1.04); }
.btn:active { transform: translateY(3px); border-bottom-width: 1px; }

.btn.primary { background: var(--primary); color: var(--on-primary); border-bottom-color: var(--primary-deep); }
.btn.small { min-height: 36px; padding: 0 14px; font-size: 13px; border-bottom-width: 3px; }
.btn.big { min-height: 54px; padding: 0 28px; font-size: 17px; border-radius: 18px; }
.btn.ghost { background: none; border: none; color: var(--muted); }
.btn.ghost:hover { color: var(--blue); filter: none; text-decoration: underline; }
.btn.ghost:active { transform: none; }
.btn.danger { background: var(--red); color: #fff; border-bottom-color: var(--red-deep); }

:is(button, a, input, textarea, select):focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-cta { margin-top: 24px; }

/* ---------- inputs (pressy fields) ---------- */

label.f-label {
  display: block; font-size: 13px; font-weight: 900;
  letter-spacing: .4px; color: var(--muted); text-transform: uppercase;
  margin: 0 6px 7px;
}
input.f, textarea.f, select.f {
  width: 100%; font-family: var(--font); font-size: 15.5px; font-weight: 700;
  color: var(--ink); background: var(--bg);
  border: 2px solid var(--hairline);
  border-radius: 14px; padding: 12px 14px;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
input.f:focus, textarea.f:focus, select.f:focus {
  border-color: var(--blue);
  outline: none;
  box-shadow: 0 0 0 4px var(--blue-soft);
}
textarea.f { resize: vertical; min-height: 78px; line-height: 1.5; }
::placeholder { color: var(--faint); opacity: 1; font-weight: 600; }
.field { margin-bottom: 18px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
button.chip {
  font-size: 13px; font-weight: 800;
  padding: 8px 14px; border-radius: 12px;
  background: var(--card); border: 2px solid var(--hairline);
  color: var(--muted); cursor: pointer; min-height: 34px;
  box-shadow: 0 2px 0 var(--hairline);
  transition: transform .08s var(--ease), border-color .15s var(--ease), color .15s var(--ease);
}
button.chip:hover { color: var(--blue); }
button.chip:active { transform: translateY(2px); box-shadow: none; }
button.chip.on {
  background: var(--blue-soft); border-color: var(--blue); color: var(--blue-deep);
  box-shadow: 0 2px 0 #bfe4f5;
}

form.card { padding: 22px 20px; }

/* ---------- review flashcard (playful 3D) ---------- */

.session { max-width: 560px; margin: 0 auto; }

.progress-line {
  font-size: 13px; font-weight: 900; letter-spacing: .6px; text-transform: uppercase;
  color: var(--muted);
  display: flex; justify-content: space-between;
  padding: 0 4px 14px;
}
.progress-line .hot-n { color: var(--blue); }

.flashwrap { perspective: 1500px; }
.flashwrap.exit { transition: all .17s var(--ease); opacity: 0; transform: translateX(-48px) scale(.95); }

.flash {
  position: relative; width: 100%;
  height: clamp(400px, 56vh, 480px);
  transform-style: preserve-3d;
  transition: transform .7s var(--bounce);
  cursor: pointer; outline: none;
}
.flash.flipped { transform: rotateY(180deg); }

.face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: #fff;
  border: 2px solid var(--hairline);
  border-radius: 20px;
  box-shadow: 0 6px 0 var(--hairline);
  padding: 30px 26px 22px;
  display: flex; flex-direction: column;
}
[data-theme="dark"] .face { background: var(--card); }
.face.back { transform: rotateY(180deg); border-color: var(--blue); box-shadow: 0 6px 0 #bfe4f5; }
[data-theme="dark"] .face.back { box-shadow: 0 6px 0 #1d4557; }

.face .q-topic {
  font-size: 13px; text-transform: uppercase; letter-spacing: 1.2px;
  font-weight: 900; color: var(--blue);
  margin: 0 0 6px;
  align-self: flex-start;
  background: var(--blue-soft); padding: 4px 10px; border-radius: 8px;
}
[data-theme="dark"] .face .q-topic { color: #7fd0ff; }

.face .q-text {
  flex: 1; display: flex; align-items: center;
  font-size: clamp(24px, 5.8vw, 36px);
  font-weight: 900; line-height: 1.15; letter-spacing: -.4px;
  margin: 0; overflow-wrap: anywhere;
}
.face.back .a-label {
  font-size: 12px; text-transform: uppercase; letter-spacing: 1.2px;
  font-weight: 900; color: var(--muted); margin: 0 0 12px;
}
.face.back .a-text {
  flex: 1; display: flex; align-items: center;
  font-size: clamp(19px, 4.6vw, 26px);
  font-weight: 700; line-height: 1.32;
  margin: 0; color: var(--ink);
  overflow-wrap: anywhere; white-space: pre-wrap;
}

.reveal-hint {
  text-align: center; color: var(--faint);
  font-size: 12px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase;
  margin: 0;
}

/* ---------- grade buttons (color-coded 3D) ---------- */

.grades {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 16px;
  opacity: 0; transform: translateY(12px) scale(.98); pointer-events: none;
  transition: opacity .4s var(--ease), transform .45s var(--bounce);
}
.grades.show { opacity: 1; transform: none; pointer-events: auto; }

.grade-btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 13px 4px 11px;
  border-radius: 16px;
  border: none;
  cursor: pointer; font-family: var(--font);
  min-height: 64px; font-weight: 900;
  transition: transform .08s var(--ease), filter .15s var(--ease);
}
.grade-btn:active { transform: translateY(3px); }
.grade-btn .g-name { font-size: 15px; font-weight: 900; }
.grade-btn .g-int { font-size: 11.5px; font-weight: 800; opacity: .85; }

.grade-btn[data-grade="again"] { background: var(--red); color: #fff; border-bottom: 4px solid var(--red-deep); }
[data-theme="dark"] .grade-btn[data-grade="again"] { border-bottom-color: var(--red-deep); }
.grade-btn[data-grade="hard"] { background: var(--coral); color: #7a5b00; border-bottom: 4px solid var(--coral-deep); }
.grade-btn[data-grade="good"] { background: var(--primary); color: #fff; border-bottom: 4px solid var(--primary-deep); }
[data-theme="light"] .grade-btn[data-grade="good"] { color: #ffffff; }
.grade-btn[data-grade="easy"] { background: var(--blue); color: #fff; border-bottom: 4px solid var(--blue-deep); }

/* ---------- done screen ---------- */

.done-hero { text-align: center; padding: 52px 18px 32px; position: relative; }
.spark-wrap { position: absolute; inset: 0; pointer-events: none; }
.done-hero .big { font-size: 64px; margin: 0 0 10px; color: var(--yellow); display: inline-block; }
.done-hero h1.display { margin-top: 4px; }
.done-numbers {
  display: flex; justify-content: center; gap: 26px;
  font-size: 13px; font-weight: 900; color: var(--muted);
  text-transform: uppercase; letter-spacing: .8px; margin-top: 14px;
}
.done-numbers .c-accent { color: var(--primary); }

/* ---------- topics / qa ---------- */

.qa-card { position: relative; }
.qa-card .qa-q { font-weight: 800; margin: 0; padding-right: 70px; font-size: 16px; }
.qa-card .qa-a { color: var(--muted); margin: 6px 0 0; font-size: 14px; white-space: pre-wrap; }
.qa-card .qa-meta {
  font-size: 11px; font-weight: 900; color: var(--faint);
  margin-top: 12px; text-transform: uppercase; letter-spacing: .8px;
}
.qa-actions { position: absolute; top: 12px; right: 12px; display: flex; gap: 4px; }
.qa-actions button {
  background: none; border: none; cursor: pointer; color: var(--faint);
  font-size: 15px; padding: 8px; border-radius: 10px;
  min-height: 38px; min-width: 38px;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.qa-actions button:hover { background: var(--card-2); color: var(--blue); }

.edit-area textarea.f { margin-bottom: 10px; }
.stack > * + * { margin-top: 14px; }

/* ---------- about ---------- */

/* sync card (v10) */
.sync-card { margin-top: 22px; }
.sync-line { font-size: 13px; font-weight: 800; color: var(--primary); margin: 0; }
.sync-card .set-sub i { color: var(--muted); }

.manifesto p { font-size: 17px; line-height: 1.65; margin: 0 0 16px; font-weight: 600; }
.manifesto .drop { color: var(--primary); font-weight: 900; }
.manifesto em { font-style: italic; }

/* ---------- nav (playful bottom bar) ---------- */

#nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: calc(84px + var(--sa-bottom));
  padding-bottom: var(--sa-bottom);
  background: var(--bg);
  border-top: 2px solid var(--hairline);
  display: flex; z-index: 50;
}
#nav button {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  background: none; border: none;
  color: var(--faint);
  font-size: 12px; font-weight: 900; letter-spacing: .3px;
  text-transform: lowercase;
  cursor: pointer; padding-top: 10px;
  transition: color .15s var(--ease), transform .15s var(--bounce);
}
#nav button .glyph {
  font-size: 26px; line-height: 1; font-weight: 900;
  transition: transform .2s var(--bounce);
}
#nav button:hover .glyph { transform: translateY(-3px) scale(1.12); }
#nav button.on { color: var(--primary); }
#nav button.on .glyph { transform: scale(1.2); }

/* color-coded nav glyphs */
#nav button[data-go="home"] .glyph { color: var(--primary); }
#nav button[data-go="plan"] .glyph { color: var(--coral); }
#nav button[data-go="topics"] .glyph { color: var(--purple); }
#nav button[data-go="review"] .glyph { color: var(--red); }
#nav button[data-go="growth"] .glyph { color: var(--blue); }
#nav button[data-go="about"] .glyph { color: var(--yellow); }
#nav button:not(.on) .glyph { opacity: .5; }

/* ---------- toast (pop square) ---------- */

#toast {
  position: fixed;
  bottom: calc(104px + var(--sa-bottom));
  left: 16px; right: 16px; max-width: 460px; margin: 0 auto;
  background: var(--blue-deep); color: #fff;
  font-size: 14px; font-weight: 800;
  padding: 14px 18px; border-radius: 16px;
  border-bottom: 4px solid #1068a0;
  opacity: 0; transform: translateY(8px) scale(.98);
  pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--bounce);
  text-align: center; z-index: 60;
}
#toast.show { opacity: 1; transform: none; }

/* reschedule panel (v7.3) */
.rs-panel {
  margin-top: 14px;
  background: var(--card-2);
  border: 2px dashed var(--line-strong);
  border-radius: 14px;
  padding: 12px 14px;
}
.rs-head { font-size: 13px; font-weight: 800; color: var(--muted); margin: 0 0 10px; }
.rs-head b { color: var(--primary); }
.rs-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.rs-row:last-child { margin-bottom: 0; }
.rs-row .chip { margin-top: 0; }
.chip.rs-reset { color: var(--red); border-color: var(--red-soft); }
.chip.rs-reset:hover { color: var(--red-deep); border-color: var(--red); }

/* ---------- read + reader (v8) ---------- */

.upload-card {
  display: flex; align-items: center; gap: 16px;
  margin-top: 18px; padding: 22px 20px;
  background: var(--card);
  border: 2px dashed var(--line-strong);
  border-radius: 16px;
  cursor: pointer;
  transition: border-color .15s var(--ease), background .15s var(--ease);
}
.upload-card:hover, .upload-card.drag { border-color: var(--primary); background: var(--primary-soft); }
.upload-glyph {
  font-size: 34px; color: var(--primary);
  width: 58px; height: 58px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg); border-radius: 14px;
  box-shadow: 0 2px 0 var(--hairline);
}
.upload-txt b { display: block; font-weight: 800; font-size: 17px; }
.upload-sub { display: block; color: var(--muted); font-size: 13px; margin-top: 2px; font-weight: 600; }

.lib-bar {
  display: block; height: 8px; border-radius: 99px;
  background: var(--card-2); margin-top: 8px;
  width: 100%; max-width: 260px; overflow: hidden;
}
.lib-bar i { display: block; height: 100%; background: var(--primary); border-radius: 99px; }
.row .rd-pos { color: var(--primary); font-weight: 900; }

/* reader — full-screen mode */
body.in-reader { padding-bottom: 0; }
body.in-reader #nav { display: none; }

.reader-top {
  position: fixed;
  top: var(--sa-top, 0px); left: 0; right: 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--bg);            /* solid: no blur compositing on mobile */
  border-bottom: 2px solid var(--hairline);
}
.rd-title { flex: 1; font-weight: 800; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--ink); }
.rd-page { font-size: 12px; font-weight: 800; color: var(--muted); background: var(--card-2); padding: 4px 10px; border-radius: 99px; }

body.in-reader main {
  padding: 0 !important;
  max-width: none;
  width: 100%;
}
body.in-reader .reader-stage { margin-top: 56px; margin-bottom: 0; }
body.in-reader { padding-bottom: 96px; }
.rd-page-wrap { will-change: transform; }

.reader-stage {
  position: relative;
  width: 100%;
  margin: 0 auto;
  background: var(--card-2);
  padding: 0;
  overflow-y: auto;          /* native vertical scrolling with momentum */
  overflow-x: hidden;
  touch-action: pan-y;               /* browser handles vertical only; ALL pinch + horizontal pan are ours */
  -webkit-overflow-scrolling: touch;
}
.rd-scroll { position: relative; width: 100%; }
.rd-page-wrap {
  position: relative;
  transform-origin: 0 0;
  margin: 0;
}
#rd-canvas { display: block; margin: 0 auto; }

.rd-zoom-hint {
  position: fixed; top: calc(var(--sa-top, 0px) + 66px); right: 12px; z-index: 35;
  background: var(--inverse-surface); color: var(--inverse-on-surface);
  font-size: 12px; font-weight: 800;
  padding: 8px 14px; border-radius: 99px;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 10px rgba(0,0,0,.25);
}
.rd-zoom-hint:active { transform: scale(.94); }

.textLayer {
  position: absolute; top: 0; left: 0;
  opacity: .9;
  line-height: 1;
  user-select: text; -webkit-user-select: text;
}
.textLayer span {
  position: absolute; white-space: pre; color: transparent;
  cursor: text;
}
.textLayer ::selection { background: color-mix(in srgb, var(--primary) 35%, transparent); }
.textLayer span::selection { background: color-mix(in srgb, var(--primary) 35%, transparent); }

.reader-dock {
  position: fixed;
  bottom: calc(10px + var(--sa-bottom)); left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  display: flex; align-items: center; gap: 10px;
  width: min(94vw, 780px);
  padding: 10px 14px;
  background: var(--card);
  border: 2px solid var(--hairline);
  border-radius: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,.18);
}
.rd-slider-wrap { flex: 1; }
#rd-slider { width: 100%; accent-color: var(--primary); }

/* immersive reading: single tap hides the chrome */
body.hidden-chrome .reader-top {
  transform: translateY(-110%);
  transition: transform .25s var(--ease);
}
body.hidden-chrome .reader-dock {
  transform: translateX(-50%) translateY(140%);
  transition: transform .25s var(--ease);
}
body.hidden-chrome .reader-stage { margin-top: 0; }
body.hidden-chrome { padding-bottom: 0 !important; }
.reader-top, .reader-dock { transition: transform .25s var(--ease); }

.sel-capture {
  position: fixed;
  left: 50%; transform: translateX(-50%);
  bottom: calc(96px + var(--sa-bottom));
  max-width: 520px; width: calc(100% - 32px);
  background: var(--card);
  border: 2px solid var(--primary);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
  z-index: 40;
  animation: rise .25s var(--bounce) both;
}
.sel-text { font-size: 13.5px; color: var(--ink); font-weight: 600; margin: 0 0 10px; line-height: 1.45; }
.seed-q { font-size: 12.5px; font-style: italic; }

/* reader mode toggle + book typography */
.rd-modes { display: flex; align-items: center; gap: 6px; }
.rd-mode { padding: 5px 12px !important; border-radius: 12px !important; }
.rd-mode.on { background: var(--primary); color: var(--on-primary); border-color: transparent; }

body.in-reader .reader-stage[data-mode="text"] {
  background: var(--bg);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
}
.rd-book {
  max-width: 680px;
  margin: 0 auto;
  padding: 22px 22px 90px;
  font-size: 18px;
  line-height: 1.75;
  font-weight: 600;
  color: var(--ink);
}
.rd-book p { margin: 0 0 1em; text-align: justify; hyphens: auto; overflow-wrap: break-word; }
.rd-book p:first-child { font-weight: 800; font-size: 1.06em; }
.rd-noselect {
  text-align: center; color: var(--muted); font-size: 15px;
  padding: 40px 20px; font-weight: 600;
}
body.in-reader .reader-stage[data-mode="text"]::selection,
.rd-book ::selection { background: color-mix(in srgb, var(--primary) 35%, transparent); }

/* ---------- empty state ---------- */

.empty { text-align: center; padding: 56px 18px 30px; }
.empty .glyph {
  font-size: 80px; line-height: 1; color: var(--blue);
  display: inline-block; margin-bottom: 18px;
}
.empty h1.display { margin-bottom: 8px; }
.empty p { color: var(--muted); margin: 0 auto 10px; max-width: 44ch; }
.empty .sub { font-size: 14px; }

/* ---------- voice UI ---------- */

.mic-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; flex: none;
  border-radius: 14px;
  border: none;
  background: var(--blue-soft);
  color: var(--blue-deep);
  cursor: pointer; font-size: 19px;
  box-shadow: 0 3px 0 #bfe4f5;
  transition: transform .08s var(--ease), background .15s var(--ease);
}
[data-theme="dark"] .mic-btn { box-shadow: 0 3px 0 #1d4557; }
.mic-btn:active { transform: translateY(2px); box-shadow: none; }
.mic-btn.rec { background: var(--red); color: #fff; box-shadow: 0 3px 0 var(--red-deep); }
@keyframes mulpulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,75,75,.45), 0 3px 0 var(--red-deep); }
  50% { box-shadow: 0 0 0 14px rgba(255,75,75,0), 0 3px 0 var(--red-deep); }
}
.mic-btn.rec { animation: mulpulse 1.1s var(--ease) infinite; }

.f-foot { display: flex; align-items: flex-end; gap: 10px; }
.f-foot .field { flex: 1; margin-bottom: 0; }

.compose-voice-tip { font-size: 13px; color: var(--muted); margin-top: 12px; font-weight: 600; }

.voice-row { margin-top: 14px; border-top: 2px dashed var(--hairline); padding-top: 12px; }
.voice-row .v-head { font-size: 12.5px; font-weight: 900; letter-spacing: .8px; text-transform: uppercase; color: var(--blue); margin-bottom: 10px; }

.speak-btn {
  background: #fff; border: 2px solid var(--hairline);
  border-radius: 12px; color: var(--blue-deep);
  font-size: 13px; font-weight: 800;
  padding: 8px 16px; cursor: pointer; min-height: 38px;
  box-shadow: 0 2px 0 var(--hairline);
  transition: transform .08s var(--ease);
}
[data-theme="dark"] .speak-btn { background: var(--card-2); }
.speak-btn:active { transform: translateY(2px); box-shadow: none; }
.speak-btn.listening { color: var(--red); border-color: var(--red); animation: mulpulse 1.1s infinite; }

.answer-log { margin-top: 16px; }
.answer-log .log-head { font-size: 12px; font-weight: 900; letter-spacing: .8px; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.log-entry { border-left: 4px solid var(--blue-soft); padding: 4px 0 4px 14px; margin-bottom: 10px; }
.log-entry.latest { border-left-color: var(--blue); }
.log-entry .log-meta { font-size: 11px; font-weight: 900; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); margin-bottom: 2px; }
.log-entry .log-meta b.g-again { color: var(--red); }
.log-entry .log-meta b.g-good, .log-entry .log-meta b.g-easy { color: var(--primary); }
.log-entry .log-meta b.g-hard { color: var(--coral-deep); }
.log-entry .log-text { font-size: 14px; color: var(--muted); line-height: 1.5; white-space: pre-wrap; font-weight: 600; }

/* settings + switch (playful) */
.set-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 2px; }
.set-row .set-label { font-size: 15px; font-weight: 800; }
.set-row .set-sub { color: var(--muted); font-size: 13px; margin-top: 2px; font-weight: 600; }
.switch {
  position: relative; width: 52px; height: 30px; flex: none;
  border-radius: 999px; border: none;
  background: var(--card-2);
  box-shadow: inset 0 2px 4px rgba(0,0,0,.12);
  cursor: pointer;
  transition: background .2s var(--ease);
}
.switch::after {
  content: ""; position: absolute; top: 3px; left: 4px;
  width: 24px; height: 24px; border-radius: 999px;
  background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,.25);
  transition: left .2s var(--bounce), background .2s var(--ease);
}
.switch.on { background: var(--primary); }
.switch.on::after { left: 24px; }

/* ---------- growth ---------- */

.growth-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 20px 0 16px; }
.g-card {
  background: var(--card); border: 2px solid var(--hairline);
  border-radius: var(--r-card); box-shadow: 0 4px 0 var(--hairline);
  padding: 16px 14px 12px;
  display: flex; flex-direction: column; gap: 2px;
}
.g-num {
  font-size: clamp(26px, 6.4vw, 38px); font-weight: 1000; line-height: 1;
  color: var(--primary); letter-spacing: -1px;
}
.g-card:nth-child(2) .g-num { color: var(--coral); }
.g-card:nth-child(3) .g-num { color: var(--blue); }
.g-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1.2px; font-weight: 900; color: var(--muted); margin-top: 8px; }
.g-sub { font-size: 11.5px; color: var(--faint); line-height: 1.4; margin-top: 3px; font-weight: 600; }

.calendar28 { display: grid; grid-template-columns: repeat(14, 1fr); gap: 4px; }
.cal-cell {
  aspect-ratio: 1; border-radius: 6px; background: var(--card-2); display: inline-block;
}
.cal-cell.d1 { background: var(--yellow-soft); }
.cal-cell.d2 { background: var(--yellow); }
.cal-cell.d3 { background: var(--coral); }
.cal-legend { display: flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 800; color: var(--faint); margin-top: 12px; }
.cal-legend .cal-cell { width: 12px; height: 12px; aspect-ratio: auto; }

/* coverage + past attempt */
.cov-box, .past-box { margin-top: 12px; }
.cov-head { font-size: 14px; font-weight: 800; margin: 0; }
.cov-head b { color: var(--primary); font-size: 17px; font-weight: 1000; }
.cov-n { color: var(--faint); font-weight: 800; }
.cov-delta { margin-left: 8px; font-weight: 900; font-size: 13px; }
.cov-delta.up { color: var(--primary); }
.cov-delta.down { color: var(--red); }
.cov-miss { font-size: 13px; color: var(--muted); margin: 4px 0 0; font-weight: 700; }
.cov-miss.none { color: var(--primary); }

.past-box { border-top: 2px dashed var(--hairline); padding-top: 10px; }
.past-head { font-size: 11px; text-transform: uppercase; letter-spacing: .8px; font-weight: 900; color: var(--faint); margin: 0 0 4px; }
.past-text { font-size: 13px; color: var(--muted); font-style: italic; margin: 0; font-weight: 600; }

/* question craft */
.qc-tip { font-size: 13px; color: var(--faint); margin: 10px 2px 0; line-height: 1.5; font-weight: 600; }
.qc-tip em { color: var(--muted); }

/* ---------- plan ---------- */

.plan-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 20px; }
@media (min-width: 760px) { .plan-grid { grid-template-columns: 1fr 1fr; } }

.plan-empty { color: var(--faint); font-size: 14px; font-style: italic; padding: 12px 4px; font-weight: 600; }

.todo-list .row { padding: 10px 8px; align-items: flex-start; }
.todo .todo-check {
  width: 26px; height: 26px;
  border: 2px solid var(--hairline);
  border-radius: 9px; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 900; color: transparent;
  background: #fff;
  box-shadow: 0 2px 0 var(--hairline);
  margin-top: 1px;
  transition: background .15s var(--ease), border-color .15s var(--ease), transform .1s var(--ease);
}
[data-theme="dark"] .todo .todo-check { background: var(--card-2); }
.todo:hover .todo-check { border-color: var(--primary); }
.todo .todo-check:active { transform: translateY(2px); box-shadow: none; }
.todo.done { opacity: .55; }
.todo.done .todo-check { background: var(--primary); border-color: var(--primary-deep); color: #fff; box-shadow: 0 2px 0 var(--primary-deep); }
.todo .todo-text { text-align: left; font-weight: 700; }
.todo.done .todo-text { text-decoration: line-through; }
.seed-mark { color: var(--purple); }

.todo-add { display: flex; gap: 8px; margin-top: 12px; }
.todo-add input.f { flex: 1; }
.todo-add .btn { flex: none; }

.cal7-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.cal7-title { font-size: 18px; font-weight: 1000; text-transform: capitalize; letter-spacing: -.3px; }
.cal7-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.cal7-dow { text-align: center; font-size: 11px; font-weight: 900; letter-spacing: .6px; color: var(--faint); padding: 8px 0; text-transform: uppercase; }
.cal7-day {
  position: relative; aspect-ratio: 1;
  border-radius: 12px; background: none; border: none;
  color: var(--muted); font-family: var(--font); font-size: 14px; font-weight: 800;
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px;
  transition: background .12s var(--ease), color .12s var(--ease), transform .12s var(--ease);
}
.cal7-day:hover { background: var(--card-2); color: var(--ink); transform: scale(1.08); }
.cal7-day.today { color: var(--blue); font-weight: 1000; background: var(--blue-soft); }
.cal7-day.sel { background: var(--blue); color: #fff; transform: scale(1.08); box-shadow: 0 3px 0 var(--blue-deep); }
.cal7-day .dots { width: 5px; height: 5px; border-radius: 99px; background: transparent; }
.cal7-day.has-ev .dots { background: var(--purple); }
.cal7-day.has-exam .dots { background: var(--red); }
.cal7-day.sel .dots { background: #fff; }
.cal7-day.has-exam { background: var(--red-soft); }
.cal7-day.sel.has-exam { background: var(--red); box-shadow: 0 3px 0 var(--red-deep); }

.day-detail { margin-top: 14px; border-top: 2px dashed var(--hairline); padding-top: 12px; }
.ev-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 14px; margin-bottom: 8px;
  background: #fff; border: 2px solid var(--hairline);
  box-shadow: 0 2px 0 var(--hairline);
}
[data-theme="dark"] .ev-item { background: var(--card-2); }
.ev-item.e-exam { border-color: var(--red); }
.ev-item.e-deadline { border-color: var(--coral); }
.ev-item.e-session { border-color: var(--primary); }
.ev-when { font-size: 11px; font-weight: 900; color: var(--faint); white-space: nowrap; min-width: 74px; text-transform: uppercase; letter-spacing: .5px; }
.ev-title { flex: 1; font-size: 14.5px; font-weight: 800; }
.ev-actions { display: flex; gap: 2px; align-items: center; }
.ev-btn {
  background: none; border: none; cursor: pointer;
  font-size: 11px; text-transform: uppercase; letter-spacing: .5px; font-weight: 900;
  color: var(--blue-deep); padding: 8px; border-radius: 10px; min-height: 36px; font-family: var(--font);
}
.ev-btn:hover { background: var(--blue-soft); }
.ev-bell { font-size: 13px; }

.ev-form { margin-top: 12px; padding: 14px; border: 2px dashed var(--hairline); border-radius: 14px; background: var(--card); }
.ev-type-row { display: flex; gap: 6px; margin-top: 8px; }

.seed-banner {
  background: var(--purple-soft); color: var(--purple-deep);
  border-radius: 14px; padding: 12px 14px;
  font-size: 14px; font-weight: 700; margin-bottom: 16px;
  border: 2px solid var(--purple);
}

/* ---------- misc ---------- */

.hidden { display: none !important; }
.footnote { font-size: 12px; color: var(--faint); text-align: center; margin-top: 30px; font-weight: 700; letter-spacing: .2px; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .grades { opacity: 1; transform: none; pointer-events: auto; }
  .bigfloat { animation: none; }
}

@media (min-width: 760px) {
  body { padding-bottom: 40px; }
  #nav {
    top: 0; bottom: auto; right: auto;
    height: auto; width: 84px; flex-direction: column;
    padding: 20px 0;
    border-top: none; border-right: 2px solid var(--hairline);
  }
  #nav button { flex: none; padding: 12px 0; }
  main, header.mast { padding-left: 116px; }
  .session { max-width: 560px; }
  #toast { bottom: 28px; }
  .done-hero { padding-top: 70px; }
}