/* ============================================================
   CRUSH DEPTH — deep-sea maths descent
   ============================================================ */
:root {
  --bg0: #02060f;
  --bg1: #04101e;
  --ink: #eaf6ff;
  --ink-dim: #9fb6cc;
  --ink-faint: #62788f;
  --accent: #34e0d8;        /* cyan — indices / hero */
  --accent-2: #25c4ff;
  --warn: #ffb145;          /* angle / highlight */
  --danger: #ff5a5a;
  --good: #54f0b0;
  --indices: #34e0d8;
  --trig: #ff9f43;
  --linear: #8b7bff;
  --panel: rgba(8, 20, 36, 0.72);
  --panel-edge: rgba(90, 190, 220, 0.22);
  --glass: rgba(10, 24, 42, 0.55);
  --radius: 16px;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  --disp: 'Chakra Petch', system-ui, sans-serif;
  --body: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--body);
  background: var(--bg0);
  color: var(--ink);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- background layers ---- */
#backdrop {
  position: fixed; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
  background-color: var(--bg0);
  transition: background-image .8s ease;
}
#backdrop.kenburns { animation: kenburns 38s ease-in-out infinite alternate; }
@keyframes kenburns {
  from { transform: scale(1.04) translate(0, 0); }
  to { transform: scale(1.14) translate(-1.5%, -2%); }
}
#bg { position: fixed; inset: 0; z-index: 1; pointer-events: none; }
#fx-flash { position: fixed; inset: 0; z-index: 5; pointer-events: none; opacity: 0; }
#popups { position: fixed; inset: 0; z-index: 6; pointer-events: none; overflow: hidden; }
#shake { position: relative; z-index: 2; height: 100%; }
#app { position: relative; height: 100%; }

/* ---- screens ---- */
.screen {
  position: absolute; inset: 0;
  display: none;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: clamp(16px, 4vw, 48px);
}
.screen.active { display: flex; flex-direction: column; align-items: center; }
.screen::-webkit-scrollbar { width: 10px; }
.screen::-webkit-scrollbar-thumb { background: rgba(120, 200, 220, 0.2); border-radius: 8px; }

/* ============================================================
   TITLE
   ============================================================ */
.title-wrap {
  margin: auto; width: 100%; max-width: 720px; text-align: center;
  padding: clamp(20px, 4vh, 60px) 0;
  animation: rise .6s cubic-bezier(.2, .8, .2, 1);
}
@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }
.eyebrow {
  font-family: var(--disp); letter-spacing: .42em; font-size: 12px; font-weight: 600;
  color: var(--accent); text-transform: uppercase; margin-bottom: 14px; opacity: .85;
  text-shadow: 0 0 18px rgba(52, 224, 216, 0.5);
}
.game-title {
  font-family: var(--disp); font-weight: 700; line-height: .92;
  font-size: clamp(56px, 13vw, 132px); letter-spacing: .01em;
  background: linear-gradient(180deg, #eafcff 0%, #6fe8ff 55%, #1ba6c8 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 6px 40px rgba(40, 200, 230, 0.45));
}
.game-title span { display: block; color: transparent; background: linear-gradient(180deg, #bff6ff, #2bb6d8); -webkit-background-clip: text; background-clip: text; }
.tagline { color: var(--ink-dim); font-size: clamp(15px, 2.4vw, 19px); margin: 18px auto 0; max-width: 30ch; }

.title-stats { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 30px 0 26px; }
.stat-card {
  background: var(--glass); border: 1px solid var(--panel-edge); border-radius: 12px;
  padding: 12px 16px; min-width: 92px; backdrop-filter: blur(10px);
  display: flex; flex-direction: column; gap: 3px;
}
.stat-val { font-family: var(--disp); font-size: 22px; font-weight: 700; color: var(--ink); }
.stat-lbl { font-size: 10px; letter-spacing: .16em; color: var(--ink-faint); text-transform: uppercase; }

.title-menu { display: flex; flex-direction: column; gap: 12px; }
.menu-btn {
  display: flex; align-items: center; gap: 16px; text-align: left;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 14px;
  padding: 16px 18px; cursor: pointer; color: var(--ink);
  backdrop-filter: blur(12px); transition: transform .18s, border-color .18s, background .18s;
}
.menu-btn:hover { transform: translateY(-2px); border-color: rgba(90, 220, 240, 0.55); background: rgba(14, 32, 54, 0.82); }
.menu-btn.primary {
  border-color: rgba(52, 224, 216, 0.6);
  background: linear-gradient(100deg, rgba(20, 70, 84, 0.9), rgba(12, 30, 50, 0.85));
  box-shadow: 0 0 40px rgba(40, 200, 220, 0.22), inset 0 0 0 1px rgba(52, 224, 216, 0.12);
}
.mb-icon { font-size: 26px; width: 40px; text-align: center; flex: none; filter: drop-shadow(0 0 10px rgba(52, 224, 216, 0.4)); }
.mb-text { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.mb-text b { font-family: var(--disp); font-size: 18px; letter-spacing: .04em; }
.mb-text i { font-style: normal; font-size: 12.5px; color: var(--ink-dim); }
.mb-go { font-size: 20px; color: var(--accent); opacity: .6; }
.menu-btn:hover .mb-go { opacity: 1; transform: translateX(3px); }

.title-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 20px 0 18px; }
.ghost-btn {
  background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--ink-dim); padding: 9px 15px; border-radius: 10px; cursor: pointer;
  font-family: var(--body); font-size: 13px; transition: .15s;
}
.ghost-btn:hover { color: var(--ink); border-color: rgba(120, 200, 220, 0.4); }
.ghost-btn b { color: var(--accent); }
.curric-badge {
  margin: 8px auto 0; max-width: 540px; font-size: 12.5px; line-height: 1.5;
  color: var(--ink-dim); background: rgba(52, 224, 216, 0.06);
  border: 1px solid rgba(52, 224, 216, 0.18); border-radius: 12px; padding: 12px 16px;
}
.curric-badge b { color: var(--ink); }
.curric-badge span { color: var(--accent); }
.made-for { margin-top: 16px; font-size: 12px; color: var(--ink-faint); letter-spacing: .04em; }

/* ============================================================
   BUTTONS (shared)
   ============================================================ */
.primary-btn, .secondary-btn, .danger-btn {
  font-family: var(--disp); font-weight: 600; letter-spacing: .05em;
  border: none; border-radius: 12px; padding: 14px 22px; cursor: pointer;
  font-size: 15px; transition: transform .15s, box-shadow .15s, filter .15s; color: #04141a;
}
.primary-btn {
  background: linear-gradient(180deg, #5af0e6, #1bbfcf);
  box-shadow: 0 10px 30px rgba(40, 210, 220, 0.4);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 40px rgba(40, 210, 220, 0.55); filter: brightness(1.06); }
.primary-btn.wide, .secondary-btn.wide { width: 100%; margin-top: 18px; }
.secondary-btn {
  background: rgba(124, 140, 255, 0.14); color: var(--ink);
  border: 1px solid rgba(124, 140, 255, 0.45);
}
.secondary-btn:hover { transform: translateY(-2px); background: rgba(124, 140, 255, 0.22); }
.danger-btn {
  background: rgba(255, 90, 90, 0.12); color: #ffd3d3; border: 1px solid rgba(255, 90, 90, 0.4);
  width: 100%; margin: 6px 0;
}
.danger-btn:hover { background: rgba(255, 90, 90, 0.2); }

.back-bar { width: 100%; max-width: 760px; margin: 0 auto 4px; display: flex; }
.back-bar.between { justify-content: space-between; align-items: center; }
.back-btn {
  background: none; border: none; color: var(--ink-dim); font-family: var(--disp);
  font-size: 14px; cursor: pointer; padding: 8px 2px; letter-spacing: .04em;
}
.back-btn:hover { color: var(--accent); }
.salvage-bank, .salvage-readout { font-family: var(--disp); color: var(--warn); font-weight: 600; }

/* ============================================================
   PANELS (drill / exam / seabase / codex)
   ============================================================ */
.panel {
  width: 100%; max-width: 760px; margin: 6px auto 40px;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: var(--radius);
  padding: clamp(18px, 3vw, 30px); backdrop-filter: blur(14px); box-shadow: var(--shadow);
  animation: rise .4s ease;
}
.panel.center { text-align: center; }
.panel-title { font-family: var(--disp); font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.panel-sub { color: var(--ink-dim); font-size: 14px; line-height: 1.55; margin-bottom: 20px; }
.field-label { display: block; font-size: 10.5px; letter-spacing: .2em; color: var(--ink-faint); text-transform: uppercase; margin: 16px 0 8px; }

.seg-row { display: flex; gap: 8px; flex-wrap: wrap; }
.seg {
  flex: 1; min-width: 72px; background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12); color: var(--ink-dim);
  padding: 11px 8px; border-radius: 10px; cursor: pointer; font-family: var(--disp); font-size: 14px;
  transition: .15s;
}
.seg:hover { color: var(--ink); }
.seg.on { background: rgba(52, 224, 216, 0.16); border-color: var(--accent); color: var(--ink); box-shadow: 0 0 18px rgba(52, 224, 216, 0.25); }

.chip-host { display: flex; gap: 7px; flex-wrap: wrap; }
.pill {
  background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--ink-dim); padding: 7px 12px; border-radius: 20px; cursor: pointer; font-size: 12.5px; transition: .15s;
}
.pill:hover { color: var(--ink); }
.pill.on { background: rgba(52, 224, 216, 0.16); border-color: var(--accent); color: var(--ink); }
.pill-note { color: var(--ink-faint); font-size: 12.5px; padding: 7px 0; }

.big-score { font-family: var(--disp); font-size: clamp(56px, 12vw, 92px); font-weight: 700; line-height: 1;
  background: linear-gradient(180deg, #eafcff, #34e0d8); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ============================================================
   QUESTION CARD
   ============================================================ */
.q-mount { width: 100%; max-width: 640px; margin: 0 auto; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.drill-mount { padding-bottom: 30px; }
.qcard {
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: var(--radius);
  padding: clamp(18px, 3vw, 26px); backdrop-filter: blur(16px); box-shadow: var(--shadow);
  animation: cardin .32s cubic-bezier(.2, .9, .2, 1);
}
@keyframes cardin { from { opacity: 0; transform: translateY(14px) scale(.99); } to { opacity: 1; transform: none; } }
.qhead { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.chip {
  font-family: var(--disp); font-size: 11px; font-weight: 600; letter-spacing: .08em;
  padding: 5px 10px; border-radius: 20px; display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid currentColor;
}
.chip i { opacity: .5; font-style: normal; }
.chip-indices { color: var(--indices); background: rgba(52, 224, 216, 0.1); }
.chip-trig { color: var(--trig); background: rgba(255, 159, 67, 0.1); }
.chip-linear { color: var(--linear); background: rgba(139, 123, 255, 0.1); }
.qdiff { font-size: 13px; color: var(--warn); letter-spacing: 2px; }

.qprompt { font-size: clamp(20px, 3.4vw, 27px); line-height: 1.45; font-weight: 500; margin: 6px 0 20px; }
.qprompt b { color: var(--accent); }

.diagram { display: flex; justify-content: center; margin: 4px 0 16px; }
.diagram svg { width: min(300px, 78%); height: auto; }
.diagram.small svg { width: 200px; }

.choices { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.choices.c2, .choices.c3 { grid-template-columns: 1fr; }
.choice {
  position: relative; display: flex; align-items: center; gap: 12px;
  background: rgba(255, 255, 255, 0.04); border: 1.5px solid rgba(255, 255, 255, 0.12);
  color: var(--ink); padding: 15px 16px; border-radius: 12px; cursor: pointer;
  font-size: 19px; font-family: var(--body); transition: transform .12s, border-color .12s, background .12s;
  text-align: left;
}
.choice:hover:not(.locked) { transform: translateY(-2px); border-color: rgba(90, 220, 240, 0.6); background: rgba(20, 40, 64, 0.7); }
.ckey {
  font-family: var(--disp); font-size: 12px; color: var(--ink-faint);
  border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 6px; width: 22px; height: 22px;
  display: grid; place-items: center; flex: none;
}
.cval { flex: 1; }
.choice.locked { cursor: default; }
.choice.correct { border-color: var(--good); background: rgba(84, 240, 176, 0.16); box-shadow: 0 0 24px rgba(84, 240, 176, 0.3); animation: pop .3s; }
.choice.correct .ckey { border-color: var(--good); color: var(--good); }
.choice.wrong { border-color: var(--danger); background: rgba(255, 90, 90, 0.14); animation: nope .35s; }
.choice.picked { border-color: var(--accent); background: rgba(52, 224, 216, 0.12); }
@keyframes pop { 0% { transform: scale(1); } 40% { transform: scale(1.04); } 100% { transform: scale(1); } }
@keyframes nope { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }

/* maths typography */
sup { font-size: .68em; vertical-align: super; line-height: 0; }
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; margin: 0 .12em; }
.frac .num { border-bottom: 1.5px solid currentColor; padding: 0 .35em; line-height: 1.1; }
.frac .den { padding: 0 .35em; line-height: 1.1; }
.muted { color: var(--ink-dim); font-size: .85em; }

/* triangle + graph svg theming */
.tri { overflow: visible; }
.tri-side { fill: var(--ink); font-size: 14px; font-family: var(--disp); font-weight: 600; }
.tri-angle { fill: var(--warn); font-size: 15px; font-family: var(--disp); font-weight: 700; }
.graph .grid { stroke: rgba(150, 200, 220, 0.1); stroke-width: 1; }
.graph .axis { stroke: rgba(180, 210, 230, 0.55); stroke-width: 1.5; }
.graph .plot { stroke: var(--linear); stroke-width: 3; stroke-linecap: round; filter: drop-shadow(0 0 6px rgba(139, 123, 255, 0.6)); }
.graph .pt { fill: var(--accent); }

/* ============================================================
   SOLUTION BOX
   ============================================================ */
.solution-box {
  margin-top: 14px; background: rgba(4, 16, 30, 0.9); border: 1px solid rgba(120, 200, 220, 0.28);
  border-radius: 14px; padding: 18px; animation: cardin .3s ease;
}
.sol-head { font-family: var(--disp); font-size: 13px; letter-spacing: .12em; color: var(--accent); margin-bottom: 10px; text-transform: uppercase; }
.sol-head.ok { color: var(--good); }
.sol-head.no { color: var(--warn); }
.sol-body { font-size: 16px; line-height: 1.65; color: var(--ink); }
.sol-body b { color: var(--accent); }
.solution-box .primary-btn { margin-top: 16px; width: 100%; }

/* ============================================================
   DIVE HUD
   ============================================================ */
#screen-dive { padding: 0; }
#screen-dive.active { justify-content: stretch; }
.hud {
  position: relative; z-index: 4; width: 100%; max-width: 760px; margin: 0 auto;
  padding: max(14px, env(safe-area-inset-top)) 16px 0;
}
.hud-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.abort {
  background: rgba(255, 90, 90, 0.12); border: 1px solid rgba(255, 90, 90, 0.3); color: #ffbcbc;
  width: 34px; height: 34px; border-radius: 9px; cursor: pointer; font-size: 15px; flex: none;
}
.abort:hover { background: rgba(255, 90, 90, 0.25); }
.zone-readout { flex: 1; text-align: center; }
#zone-name { font-family: var(--disp); font-size: 12.5px; letter-spacing: .16em; color: var(--accent); display: block; }
#zone-prog-wrap { display: inline-block; width: 140px; height: 3px; background: rgba(255, 255, 255, 0.12); border-radius: 3px; margin-top: 5px; overflow: hidden; }
#zone-prog { display: block; height: 100%; width: 0; background: var(--accent); box-shadow: 0 0 10px var(--accent); transition: width .5s ease; }
.salvage-readout { font-size: 15px; flex: none; min-width: 64px; text-align: right; }

.depth-readout { text-align: center; margin: 6px 0 2px; }
#depth-num { font-family: var(--disp); font-size: clamp(46px, 11vw, 74px); font-weight: 700; line-height: 1;
  text-shadow: 0 0 30px rgba(52, 224, 216, 0.4); letter-spacing: .02em; }
.depth-unit { font-family: var(--disp); font-size: 20px; color: var(--ink-dim); margin-left: 6px; }

.gauges { display: flex; align-items: center; gap: 14px; max-width: 520px; margin: 8px auto 0; }
.gauge { flex: 1; display: flex; align-items: center; gap: 8px; }
.gauge label { font-family: var(--disp); font-size: 12px; color: var(--ink-dim); width: 24px; }
.gauge .bar { flex: 1; height: 12px; background: rgba(255, 255, 255, 0.1); border-radius: 7px; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.1); }
.gauge .bar span { display: block; height: 100%; width: 100%; border-radius: 7px;
  background: linear-gradient(90deg, #2bd4cf, #5af0e6); transition: width .25s ease; }
.o2-gauge .bar span.low { background: linear-gradient(90deg, #ffb145, #ffd27a); }
.o2-gauge .bar span.crit { background: linear-gradient(90deg, #ff5a5a, #ff8a8a); animation: pulseb .5s infinite; }
@keyframes pulseb { 50% { opacity: .55; } }
.hull-pips { display: flex; gap: 2px; font-size: 16px; flex: none; }
.hull-pips span.spent { filter: grayscale(1) brightness(.5); opacity: .5; }

.combo-badge {
  position: fixed; top: 34%; right: 6%; transform: translateY(-50%) scale(.6); z-index: 6;
  font-family: var(--disp); font-weight: 700; font-size: 40px; color: var(--warn);
  opacity: 0; pointer-events: none; text-shadow: 0 0 24px rgba(255, 177, 69, 0.7); transition: .2s;
}
.combo-badge.show { opacity: 1; transform: translateY(-50%) scale(1); }
.combo-badge.hot { color: #ff6a3c; font-size: 52px; animation: comboHot .4s infinite alternate; }
@keyframes comboHot { from { transform: translateY(-50%) scale(1); } to { transform: translateY(-50%) scale(1.12); } }

.boss-wrap { width: 100%; max-width: 760px; margin: 6px auto 0; padding: 0 16px; position: relative; z-index: 4; }
.boss-panel { background: rgba(40, 8, 8, 0.7); border: 1px solid rgba(255, 90, 50, 0.5); border-radius: 12px; padding: 10px 14px; box-shadow: 0 0 30px rgba(255, 80, 40, 0.3); }
.boss-panel.hidden { display: none; }
.boss-name { font-family: var(--disp); font-size: 13px; letter-spacing: .12em; color: #ff8a5a; text-align: center; }
.boss-hp { display: flex; gap: 4px; margin-top: 7px; }
.boss-hp span { flex: 1; height: 9px; border-radius: 5px; }
.boss-hp span.on { background: linear-gradient(90deg, #ff5a3c, #ff9f43); box-shadow: 0 0 10px rgba(255, 90, 40, 0.6); }
.boss-hp span.off { background: rgba(255, 255, 255, 0.1); }
#screen-dive.boss-mode { box-shadow: inset 0 0 120px rgba(255, 40, 20, 0.25); }
#screen-dive.boss-mode .qcard { border-color: rgba(255, 90, 50, 0.4); }

.boss-intro, .zone-clear { text-align: center; padding: 24px 10px; animation: cardin .4s ease; }
.boss-warn { font-family: var(--disp); color: var(--danger); letter-spacing: .3em; font-size: 13px; animation: pulseb .8s infinite; }
.boss-intro h2, .zone-clear h2 { font-family: var(--disp); font-size: clamp(26px, 6vw, 40px); margin: 8px 0; color: #ff9f6a; }
.zone-clear h2 { color: var(--good); }
.boss-intro p, .zone-clear p { color: var(--ink-dim); max-width: 38ch; margin: 6px auto; font-size: 15px; }
.boss-hint { color: var(--ink-faint) !important; font-size: 13px !important; }
.zc-kicker { font-family: var(--disp); letter-spacing: .3em; color: var(--good); font-size: 13px; }
.zc-next { margin: 14px 0; font-family: var(--disp); color: var(--accent); }
.boss-intro .primary-btn, .zone-clear .primary-btn { margin-top: 18px; }
.leviathan-img {
  display: block; width: min(460px, 86%); margin: -10px auto -6px;
  mix-blend-mode: screen; pointer-events: none;
  animation: levfloat 5s ease-in-out infinite alternate;
  -webkit-mask-image: radial-gradient(ellipse 62% 60% at center, #000 60%, transparent 84%);
  mask-image: radial-gradient(ellipse 62% 60% at center, #000 60%, transparent 84%);
}
@keyframes levfloat { from { transform: translateY(-7px) scale(1); } to { transform: translateY(7px) scale(1.025); } }

/* ============================================================
   SUMMARY
   ============================================================ */
.summary { margin: auto; text-align: center; max-width: 620px; animation: rise .5s ease; padding: 20px 0; }
.sum-kicker { font-family: var(--disp); letter-spacing: .28em; color: var(--danger); font-size: 14px; }
.win-kicker { color: var(--good); }
.summary h1 { font-family: var(--disp); font-size: clamp(46px, 12vw, 88px); font-weight: 700; margin: 8px 0; line-height: 1; }
.summary.win h1 { font-size: clamp(34px, 8vw, 60px); background: linear-gradient(180deg, #eafcff, #54f0b0); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sum-sub { color: var(--ink-dim); margin-bottom: 24px; font-size: 15px; }
.best-tag { color: var(--warn); font-family: var(--disp); font-size: 12px; letter-spacing: .1em; padding: 2px 8px; border: 1px solid var(--warn); border-radius: 20px; margin-left: 6px; }
.sum-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; max-width: 440px; margin: 0 auto 26px; }
.sum-stat { background: var(--glass); border: 1px solid var(--panel-edge); border-radius: 12px; padding: 16px; }
.sum-stat span { font-family: var(--disp); font-size: 24px; font-weight: 700; display: block; }
.sum-stat label { font-size: 10.5px; letter-spacing: .14em; color: var(--ink-faint); text-transform: uppercase; }
.sum-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ============================================================
   EXAM
   ============================================================ */
.exam-head { width: 100%; max-width: 640px; margin: 4px auto 14px; }
.exam-prog { height: 5px; background: rgba(255, 255, 255, 0.1); border-radius: 4px; overflow: hidden; }
.exam-prog span { display: block; height: 100%; background: linear-gradient(90deg, var(--indices), var(--accent-2)); transition: width .3s ease; box-shadow: 0 0 12px var(--accent); }
.exam-count { font-family: var(--disp); font-size: 14px; color: var(--ink-dim); margin-top: 8px; text-align: center; }
.exam-count i { color: var(--ink-faint); font-style: normal; }
.exam-best { background: rgba(255, 177, 69, 0.1); border: 1px solid rgba(255, 177, 69, 0.3); border-radius: 10px; padding: 10px 14px; font-size: 14px; color: var(--ink-dim); margin-bottom: 16px; }
.exam-best b { color: var(--warn); }
.exam-result-head { display: flex; align-items: center; gap: 20px; margin-bottom: 20px; }
.result-meta { display: flex; flex-direction: column; }
.result-meta b { font-family: var(--disp); font-size: 22px; }
.result-meta span { color: var(--ink-dim); font-size: 14px; }

.topic-bars { display: flex; flex-direction: column; gap: 12px; margin-bottom: 22px; }
.tbar-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; font-size: 14px; }
.tbar-track { height: 10px; background: rgba(255, 255, 255, 0.08); border-radius: 6px; overflow: hidden; }
.tbar-fill { display: block; height: 100%; border-radius: 6px; }
.fill-indices { background: linear-gradient(90deg, #1ba6a0, var(--indices)); }
.fill-trig { background: linear-gradient(90deg, #d97a26, var(--trig)); }
.fill-linear { background: linear-gradient(90deg, #5a4ad0, var(--linear)); }

.review-title { font-family: var(--disp); font-size: 16px; margin: 8px 0 12px; color: var(--ink); }
.review-list { display: flex; flex-direction: column; gap: 8px; }
.review-item { background: rgba(4, 16, 30, 0.7); border: 1px solid rgba(120, 200, 220, 0.18); border-radius: 12px; overflow: hidden; }
.review-item summary { padding: 13px 15px; cursor: pointer; display: flex; gap: 10px; align-items: center; list-style: none; font-size: 15px; }
.review-item summary::-webkit-details-marker { display: none; }
.review-item summary::after { content: '▾'; margin-left: auto; color: var(--ink-faint); }
.review-item[open] summary::after { transform: rotate(180deg); }
.rev-q { flex: 1; }
.rev-body { padding: 0 15px 16px; border-top: 1px solid rgba(255, 255, 255, 0.06); }
.rev-ans { margin: 12px 0 8px; font-size: 15px; }
.rev-ans b { color: var(--good); }
.flawless { text-align: center; color: var(--good); padding: 20px; font-size: 16px; }

/* ============================================================
   SEABASE
   ============================================================ */
.upgrade-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.up-card {
  background: rgba(6, 18, 32, 0.7); border: 1px solid var(--panel-edge); border-radius: 14px;
  padding: 16px; display: flex; flex-direction: column; gap: 8px;
}
.up-card.topic-indices { border-color: rgba(52, 224, 216, 0.3); }
.up-card.topic-trig { border-color: rgba(255, 159, 67, 0.3); }
.up-card.topic-linear { border-color: rgba(139, 123, 255, 0.3); }
.up-top { display: flex; align-items: center; justify-content: space-between; }
.up-icon { font-size: 24px; }
.up-tag { font-family: var(--disp); font-size: 9.5px; letter-spacing: .14em; color: var(--ink-faint); border: 1px solid rgba(255, 255, 255, 0.15); padding: 3px 7px; border-radius: 16px; }
.up-card h3 { font-family: var(--disp); font-size: 17px; }
.up-desc { font-size: 12.5px; color: var(--ink-dim); line-height: 1.5; flex: 1; }
.up-level { display: flex; flex-direction: column; gap: 5px; }
.up-pips { display: flex; gap: 4px; }
.up-pips span { flex: 1; height: 6px; border-radius: 4px; background: rgba(255, 255, 255, 0.12); }
.up-pips span.on { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.up-blurb { font-size: 11.5px; color: var(--accent); font-family: var(--disp); }
.buy-btn {
  font-family: var(--disp); background: rgba(52, 224, 216, 0.16); border: 1px solid var(--accent);
  color: var(--ink); padding: 10px; border-radius: 10px; cursor: pointer; font-size: 13px; transition: .15s; margin-top: 4px;
}
.buy-btn:hover { background: rgba(52, 224, 216, 0.28); }
.buy-btn.cant { opacity: .45; border-color: rgba(255, 255, 255, 0.2); background: rgba(255, 255, 255, 0.04); cursor: not-allowed; color: var(--ink-faint); }
.buy-btn.maxed { border-color: var(--good); color: var(--good); background: rgba(84, 240, 176, 0.1); cursor: default; }
.buy-btn.shake { animation: nope .4s; }

/* ============================================================
   CODEX
   ============================================================ */
.codex-grid { display: flex; flex-direction: column; gap: 12px; }
.codex-card { border-radius: 14px; padding: 18px; border: 1px solid var(--panel-edge); background: rgba(6, 14, 26, 0.7); position: relative; overflow: hidden; }
.codex-card.locked { opacity: .7; }
.codex-card.got { border-color: rgba(84, 240, 176, 0.4); background: rgba(8, 26, 22, 0.7); }
.cx-zone { font-family: var(--disp); font-size: 11px; letter-spacing: .14em; color: var(--ink-faint); }
.codex-card h3 { font-family: var(--disp); font-size: 22px; margin: 6px 0; color: #ff9f6a; }
.codex-card.locked h3 { color: var(--ink-faint); }
.codex-card p { font-size: 13.5px; color: var(--ink-dim); line-height: 1.5; max-width: 46ch; }
.codex-card.got { padding-right: 38%; }
.cx-img { position: absolute; right: -6px; top: 50%; transform: translateY(-50%); height: 116%; width: auto; max-width: 50%; object-fit: contain; mix-blend-mode: screen; opacity: .62; pointer-events: none; -webkit-mask-image: radial-gradient(ellipse 70% 64% at center, #000 55%, transparent 86%); mask-image: radial-gradient(ellipse 70% 64% at center, #000 55%, transparent 86%); }
.cx-stamp { position: absolute; top: 14px; right: 14px; z-index: 1; font-family: var(--disp); font-size: 11px; letter-spacing: .14em; padding: 4px 9px; border-radius: 16px; border: 1px solid var(--good); color: var(--good); background: rgba(8, 26, 22, 0.6); }
.cx-stamp.locked { border-color: rgba(255, 255, 255, 0.2); color: var(--ink-faint); }

/* drill in-session bar */
.drill-bar { width: 100%; max-width: 640px; margin: 0 auto 8px; display: flex; justify-content: space-between; align-items: center; }
.drill-score { font-family: var(--disp); font-size: 16px; color: var(--accent); }

/* ============================================================
   MODALS
   ============================================================ */
#modal-root { position: fixed; inset: 0; z-index: 20; display: none; }
#modal-root.open { display: block; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(2, 6, 14, 0.78); backdrop-filter: blur(6px); display: grid; place-items: center; padding: 20px; animation: fade .2s; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal { width: 100%; max-width: 460px; background: var(--panel); border: 1px solid var(--panel-edge); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); animation: rise .25s ease; }
.modal h2 { font-family: var(--disp); margin-bottom: 16px; }
.how-list { list-style: none; display: flex; flex-direction: column; gap: 11px; margin-bottom: 18px; }
.how-list li { font-size: 14px; color: var(--ink-dim); line-height: 1.5; padding-left: 18px; position: relative; }
.how-list li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.how-list b { color: var(--ink); }
.modal .primary-btn { width: 100%; margin-top: 6px; }
.toggle-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.07); font-size: 15px; }
.toggle { width: 48px; height: 27px; border-radius: 20px; background: rgba(255, 255, 255, 0.12); border: none; cursor: pointer; position: relative; transition: .2s; }
.toggle::after { content: ''; position: absolute; top: 3px; left: 3px; width: 21px; height: 21px; border-radius: 50%; background: var(--ink-dim); transition: .2s; }
.toggle.on { background: rgba(52, 224, 216, 0.4); }
.toggle.on::after { left: 24px; background: var(--accent); }

/* ============================================================
   POPUPS (floating score text)
   ============================================================ */
.popup {
  position: absolute; transform: translate(-50%, -50%); font-family: var(--disp); font-weight: 700;
  white-space: nowrap; animation: floatUp 1.2s ease-out forwards; text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}
@keyframes floatUp {
  0% { opacity: 0; transform: translate(-50%, 10px) scale(.7); }
  18% { opacity: 1; transform: translate(-50%, -8px) scale(1.1); }
  100% { opacity: 0; transform: translate(-50%, -64px) scale(1); }
}
.popup-gain { color: var(--accent); font-size: 28px; }
.popup-combo { color: var(--warn); font-size: 22px; }
.popup-crit { color: #ff7a3c; font-size: 34px; }
.popup-penalty { color: var(--danger); font-size: 22px; }
.popup-info { color: var(--ink); font-size: 20px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 560px) {
  .choices { grid-template-columns: 1fr; }
  .sum-grid { grid-template-columns: 1fr; }
  .upgrade-grid { grid-template-columns: 1fr; }
  .combo-badge { right: 50%; top: 30%; transform: translateX(50%) scale(.6); }
  .combo-badge.show { transform: translateX(50%) scale(1); }
  .game-title { font-size: clamp(52px, 18vw, 96px); }
}
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  #backdrop.kenburns { animation: none; }
}