/* ===========================================================================
   Cue Coach — styles. Mobile-first, dark billiard theme.
   =========================================================================== */
:root {
  --bg: #0c1512;
  --bg2: #11201a;
  --felt: #0e7d4a;
  --felt-d: #0a5c37;
  --gold: #ffd23f;
  --ink: #eef3ef;
  --muted: #9bb0a6;
  --card: #16241d;
  --card2: #1d3329;
  --line: #28433685;
  --cyan: #7fe3ff;
  --orange: #ff9d54;
  --danger: #ff6b6b;
  --radius: 16px;
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(120% 80% at 50% -10%, #17302440 0%, transparent 60%), var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  display: flex; flex-direction: column; min-height: 100dvh;
  overscroll-behavior: none;
}

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px calc(10px); gap: 12px;
  background: linear-gradient(180deg, #0d231a, #0c1512);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { font-size: 26px; filter: drop-shadow(0 2px 4px #000a); }
.brand h1 { font-size: 18px; margin: 0; letter-spacing: .2px; }
.brand p { font-size: 11.5px; margin: 0; color: var(--muted); }
.ghost-btn {
  background: #ffffff14; color: var(--ink); border: 1px solid var(--line);
  border-radius: 999px; padding: 7px 13px; font-size: 13px; font-weight: 600;
}

/* ---- screens ---- */
.screen { display: none; flex: 1; flex-direction: column; padding: 16px; gap: 14px; }
.screen.active { display: flex; }

/* ---- home ---- */
.hero { max-width: 560px; margin: 4px auto; width: 100%; }
.hero h2 { font-size: 26px; margin: 6px 0 4px; }
.lede { color: var(--muted); font-size: 15px; line-height: 1.5; margin: 0 0 20px; }
.home-actions { display: flex; flex-direction: column; gap: 12px; }
.big-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 17px; border-radius: var(--radius); font-size: 16.5px; font-weight: 700;
  background: var(--card); border: 1px solid var(--line); color: var(--ink);
  cursor: pointer; transition: transform .08s ease, background .15s;
}
.big-btn:active { transform: scale(.985); }
.big-btn.primary { background: linear-gradient(180deg, #17a05f, #0e7d4a); border-color: #1fae67; }
.big-btn.subtle { background: #ffffff0d; font-size: 15px; }
.how { color: var(--muted); font-size: 14px; line-height: 2; margin-top: 24px;
  list-style: none; padding: 16px; background: #ffffff07; border-radius: var(--radius);
  border: 1px solid var(--line); }
.how b { color: var(--gold); margin-right: 4px; }

/* ---- steps + hints ---- */
.steps { display: flex; gap: 8px; }
.step-pill {
  flex: 1; padding: 9px; border-radius: 999px; font-weight: 700; font-size: 13.5px;
  background: #ffffff0d; color: var(--muted); border: 1px solid var(--line);
}
.step-pill.active { background: var(--gold); color: #1a1a1a; border-color: var(--gold); }
.step-pill.done { color: var(--ink); }
.hint { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.45; }
.hint b { color: var(--gold); }

/* ---- canvas ---- */
.canvas-wrap {
  flex: 1; min-height: 240px; background: #0a120e; border-radius: var(--radius);
  border: 1px solid var(--line); overflow: hidden; position: relative;
  display: flex; align-items: center; justify-content: center;
}
.canvas-wrap.top { background: #07120c; }
canvas { display: block; width: 100%; height: 100%; touch-action: none; }

/* ---- toolbars ---- */
.toolbar { display: flex; flex-direction: column; gap: 10px; }
.palette { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.group-row { justify-content: space-between; }
.lbl { font-size: 13px; color: var(--muted); }
.tool {
  padding: 12px 14px; border-radius: 12px; font-weight: 700; font-size: 14px;
  background: var(--card2); color: var(--ink); border: 1px solid var(--line); flex: 1;
  cursor: pointer; min-height: 46px;
}
.tool.primary { background: linear-gradient(180deg, #17a05f, #0e7d4a); border-color: #1fae67; }
.tool.danger { background: #3a1d1d; border-color: #5a2a2a; color: #ffb3b3; }
.tool.wide { flex: 1; }
.tool:disabled { opacity: .45; }
.chip {
  padding: 10px 12px; border-radius: 999px; font-weight: 700; font-size: 13.5px;
  background: #ffffff0d; color: var(--ink); border: 2px solid var(--line); cursor: pointer;
}
.chip.active { border-color: var(--gold); box-shadow: 0 0 0 2px #ffd23f33; }
.chip.cue.active { background: #f6f5ef22; }
.chip.solid { background: #d9940022; } .chip.stripe { background: #2a72c922; }
.chip.eight { background: #15151a; }
.num { width: 56px; padding: 10px; border-radius: 10px; background: #ffffff0d;
  border: 1px solid var(--line); color: var(--ink); font-size: 15px; text-align: center; }
.grp { padding: 9px 12px; border-radius: 999px; font-weight: 700; font-size: 13px;
  background: #ffffff0d; color: var(--muted); border: 1px solid var(--line); }
.grp.active { background: var(--cyan); color: #07212b; border-color: var(--cyan); }

/* ---- decision banner ---- */
.decision { display: flex; flex-direction: column; gap: 3px; width: 100%; text-align: left;
  padding: 13px 15px; border-radius: 14px; border: 1px solid; cursor: pointer; color: var(--ink); }
.decision .dh { font-size: 15.5px; font-weight: 800; }
.decision small { font-size: 12.5px; opacity: .92; line-height: 1.4; }
.decision .dact { margin-top: 4px; font-weight: 700; opacity: .8; }
.decision.run { background: linear-gradient(180deg, #123a26, #0e2e1e); border-color: #1e7d4e; }
.decision.run .dh { color: #6ee7a0; }
.decision.safety { background: linear-gradient(180deg, #3d2e10, #2e2410); border-color: #b8821f; }
.decision.safety .dh { color: #ffce5a; }

/* ---- advice ---- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.card-head { display: flex; justify-content: space-between; align-items: center; }
.counter { font-size: 12.5px; color: var(--muted); font-weight: 700; letter-spacing: .4px; text-transform: uppercase; }
.rating { font-size: 12.5px; font-weight: 800; padding: 4px 10px; border-radius: 999px; }
.rating.Easy { background: #16432c; color: #6ee7a0; }
.rating.Medium { background: #4a3d12; color: #ffd23f; }
.rating.Hard { background: #4a2a12; color: #ff9d54; }
.rating.Risky { background: #4a1d1d; color: #ff8a8a; }
#shot-title { margin: 8px 0 12px; font-size: 18px; line-height: 1.3; }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
.metrics > div { background: #ffffff0a; border: 1px solid var(--line); border-radius: 10px; padding: 8px 6px; text-align: center; }
.mk { display: block; font-size: 10.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .4px; margin-bottom: 3px; }
.metrics b { font-size: 13.5px; }
.coach { margin: 0; font-size: 14.5px; line-height: 1.55; color: #d8e6df; }
.advice-controls { display: flex; gap: 10px; align-items: center; }
.dots { flex: 1; display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: #ffffff26; }
.dot.active { background: var(--gold); transform: scale(1.25); }
.plan { display: flex; flex-direction: column; gap: 6px; padding-bottom: var(--safe-b); }
.plan-item { display: flex; gap: 10px; align-items: center; padding: 10px 12px;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; font-size: 14px; }
.plan-item.cur { border-color: var(--gold); }
.plan-item .n { width: 22px; height: 22px; border-radius: 50%; background: var(--gold); color: #1a1a1a;
  display: grid; place-items: center; font-weight: 800; font-size: 12px; flex: none; }
.plan-item.safety .n { background: var(--cyan); color: #07212b; }
.plan-item small { color: var(--muted); margin-left: auto; }

/* ---- strike face (cue-ball hit point) ---- */
.shot-body { display: flex; gap: 12px; align-items: stretch; }
.shot-body .metrics { flex: 1; grid-template-columns: repeat(2, 1fr); margin-bottom: 0; }
.strike-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.strike-face { width: 96px; height: 96px; display: block; }
.strike-face.pad { width: 104px; height: 104px; touch-action: none; cursor: grab; }
.strike-cap { text-align: center; line-height: 1.25; }
.strike-cap .mk { display: block; font-size: 9.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .3px; }
.strike-cap b { display: block; font-size: 13px; color: var(--orange); text-transform: capitalize; }
.strike-cap span#strike-tips, .strike-cap span#sim-strike-tips { font-size: 11px; color: var(--muted); }

/* ---- simulator ---- */
.strike-row { align-items: center; gap: 14px; }
.spin-presets { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.spin-presets .spin { flex: 1 1 40%; }
.spin { padding: 10px 12px; border-radius: 999px; font-weight: 700; font-size: 13px;
  background: #ffffff0d; color: var(--muted); border: 1px solid var(--line); cursor: pointer; }
.spin.active { background: var(--orange); color: #2a1405; border-color: var(--orange); }
.slider { flex: 1; min-width: 90px; accent-color: var(--orange); height: 28px; }
.lbl.pw { margin-left: 6px; }
.sim-readout { font-size: 14.5px; line-height: 1.5; padding: 12px 14px; min-height: 20px; }
.sim-readout b { color: var(--ink); }
.sim-readout .good { color: #6ee7a0; font-weight: 700; }
.sim-readout .bad { color: #ff8a8a; font-weight: 700; }
.sim-readout .warn { color: var(--orange); font-weight: 700; }

/* ---- learn: lesson list ---- */
.learn-title { font-size: 22px; margin: 2px 0 0; }
.learn-bar { height: 8px; border-radius: 999px; background: #ffffff14; overflow: hidden; }
.learn-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #17a05f, #6ee7a0); transition: width .3s; }
.lesson-list { display: flex; flex-direction: column; gap: 10px; padding-bottom: var(--safe-b); }
.lesson-card { display: flex; align-items: center; gap: 12px; padding: 14px; background: var(--card);
  border: 1px solid var(--line); border-radius: 14px; cursor: pointer; text-align: left; color: var(--ink); width: 100%; }
.lesson-card:active { transform: scale(.99); }
.lesson-card .lc-ic { font-size: 24px; flex: none; width: 30px; text-align: center; }
.lesson-card .lc-main { flex: 1; min-width: 0; }
.lesson-card .lc-title { font-weight: 800; font-size: 15.5px; }
.lesson-card .lc-blurb { font-size: 12.5px; color: var(--muted); line-height: 1.35; margin-top: 2px; }
.lesson-card .lc-meta { font-size: 11px; color: var(--muted); margin-top: 4px; }
.lesson-card .lc-badge { flex: none; font-size: 12px; font-weight: 800; padding: 5px 9px; border-radius: 999px;
  background: #ffffff12; color: var(--muted); }
.lesson-card .lc-badge.done { background: #16432c; color: #6ee7a0; }

/* ---- learn: single lesson ---- */
.lesson-top { display: flex; align-items: center; justify-content: space-between; }
.lesson-h { font-size: 20px; margin: 4px 0 0; }
.lesson-content { display: flex; flex-direction: column; gap: 6px; }
.lesson-content h4 { font-size: 15px; margin: 12px 0 2px; color: var(--gold); }
.lesson-content p { margin: 4px 0; font-size: 14.5px; line-height: 1.55; color: #d8e6df; }
.lesson-content ul { margin: 4px 0; padding-left: 20px; }
.lesson-content li { font-size: 14px; line-height: 1.5; color: #d8e6df; margin: 3px 0; }
.lesson-tip { background: #14342433; border: 1px solid #1e7d4e66; border-left: 3px solid #1fae67;
  border-radius: 10px; padding: 10px 12px; font-size: 13.5px; color: #bfe9d2; margin: 8px 0; }
.lesson-tip b { color: #6ee7a0; }
.ex-fig { margin: 10px 0; }
.ex-fig canvas.ex-table { width: 100%; aspect-ratio: 2 / 1; background: #07120c; border-radius: 12px; border: 1px solid var(--line); display: block; }
.ex-faces { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; padding: 8px; background: #ffffff07; border-radius: 12px; border: 1px solid var(--line); }
.ex-face { text-align: center; }
.ex-face canvas { width: 84px; height: 84px; display: block; }
.ex-face span { font-size: 11.5px; color: var(--muted); }
.ex-cap { font-size: 12.5px; color: var(--muted); margin-top: 6px; line-height: 1.4; }
.ex-try { margin-top: 8px; padding: 9px 13px; border-radius: 10px; font-weight: 700; font-size: 13px;
  background: var(--card2); border: 1px solid #2f7; color: #aef0c6; }

/* ---- quiz ---- */
.quiz { margin-top: 14px; display: flex; flex-direction: column; gap: 12px; }
.quiz-h { font-size: 16px; font-weight: 800; }
.q-block { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.q-q { font-weight: 700; font-size: 14.5px; margin-bottom: 9px; }
.q-opt { display: block; width: 100%; text-align: left; padding: 10px 12px; margin: 6px 0; border-radius: 10px;
  background: #ffffff0d; border: 1px solid var(--line); color: var(--ink); font-size: 14px; cursor: pointer; }
.q-opt.correct { background: #16432c; border-color: #2e9d62; color: #b9f3cf; }
.q-opt.wrong { background: #4a1d1d; border-color: #7a3a3a; color: #ffb3b3; }
.q-opt:disabled { cursor: default; }
.q-explain { font-size: 13px; color: var(--muted); margin-top: 8px; line-height: 1.45; display: none; }
.q-explain.show { display: block; }
.quiz-score { text-align: center; font-weight: 800; font-size: 16px; padding: 12px; border-radius: 12px;
  background: var(--card2); border: 1px solid var(--line); }
.quiz-score.pass { background: #16432c; color: #6ee7a0; }

/* ---- coach chat ---- */
.coach-btn { background: linear-gradient(180deg, #2a3f8f, #1f2f6e); border-color: #3a52b0; color: #dfe6ff; }
.sheet { position: fixed; inset: 0; z-index: 40; display: none; flex-direction: column;
  background: #0b1410ee; backdrop-filter: blur(6px); }
.sheet.open { display: flex; }
.sheet-head { display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--line); font-weight: 800; font-size: 16px;
  padding-top: calc(14px + env(safe-area-inset-top, 0px)); }
.coach-msgs { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.cmsg { max-width: 88%; padding: 11px 14px; border-radius: 16px; font-size: 14.5px; line-height: 1.5; white-space: pre-wrap; }
.cmsg.user { align-self: flex-end; background: #2a3f8f; color: #fff; border-bottom-right-radius: 5px; }
.cmsg.bot { align-self: flex-start; background: var(--card2); border: 1px solid var(--line); color: #e6efe9; border-bottom-left-radius: 5px; }
.cmsg.bot.pending { color: var(--muted); font-style: italic; }
.coach-empty { color: var(--muted); font-size: 14px; text-align: center; margin: auto; max-width: 280px; line-height: 1.5; }
.coach-suggest { display: flex; gap: 8px; overflow-x: auto; padding: 8px 12px; border-top: 1px solid var(--line); }
.csug { flex: none; padding: 8px 12px; border-radius: 999px; font-size: 12.5px; white-space: nowrap;
  background: #ffffff0d; border: 1px solid var(--line); color: var(--ink); cursor: pointer; }
.coach-input { display: flex; gap: 8px; padding: 12px; padding-bottom: calc(12px + var(--safe-b));
  border-top: 1px solid var(--line); }
.coach-input input { flex: 1; padding: 13px 14px; border-radius: 12px; background: #ffffff10;
  border: 1px solid var(--line); color: var(--ink); font-size: 15px; }
.coach-input .tool { flex: none; min-width: 76px; }

/* ---- toast ---- */
.toast { position: fixed; left: 50%; bottom: calc(20px + var(--safe-b)); transform: translateX(-50%);
  background: #0c1f17; border: 1px solid var(--line); color: var(--ink); padding: 11px 16px;
  border-radius: 999px; font-size: 13.5px; z-index: 30; box-shadow: 0 8px 24px #000a; max-width: 90vw; }

@media (min-width: 720px) {
  .screen { max-width: 760px; margin: 0 auto; width: 100%; }
  .metrics b { font-size: 15px; }
}