/* BBT Train -- premium dark, mobile-first. */
:root {
  --bg: #0c0c0e;
  --bg-elev: #161618;
  --bg-elev-2: #1f1f23;
  --line: #2a2a2f;
  --txt: #f4f4f5;
  --txt-dim: #9a9aa2;
  --txt-faint: #6a6a72;
  --accent: #2d5aa0;
  --accent-dim: #13243f;
  --done: #30d158;
  --done-dim: #14361f;
  --radius: 16px;
  --radius-sm: 11px;
  --tabbar-h: 64px;
  --topbar-h: 54px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bot: env(safe-area-inset-bottom, 0px);
  font-size: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html, body {
  background: var(--bg);
  color: var(--txt);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

body { height: 100dvh; overflow: hidden; }

#app { display: flex; flex-direction: column; height: 100dvh; max-width: 560px; margin: 0 auto; position: relative; }

/* ---------- Top bar ---------- */
#topbar {
  height: calc(var(--topbar-h) + var(--safe-top));
  padding: var(--safe-top) 18px 0;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1.5px 1.5px at 14% 62%, rgba(255,255,255,.55), transparent),
    radial-gradient(1px 1px at 30% 30%, rgba(255,255,255,.4), transparent),
    radial-gradient(1.5px 1.5px at 52% 72%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 72% 38%, rgba(255,255,255,.38), transparent),
    radial-gradient(1px 1px at 88% 64%, rgba(255,255,255,.45), transparent),
    radial-gradient(130% 180% at 28% -40%, rgba(45,90,160,.45), transparent 62%),
    linear-gradient(180deg, #0b1430, #0a0e1c);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 9px; }
.brand-logo { height: 40px; width: 40px; display: block; flex: none; object-fit: contain; filter: drop-shadow(0 1px 6px rgba(45,90,160,.55)); }
.brand-word { font-weight: 800; letter-spacing: 1.3px; font-size: 14px; white-space: nowrap; }
.brand-mark { font-weight: 800; letter-spacing: 1.5px; font-size: 19px; }
.brand-mark::first-letter { color: var(--accent); }
.brand-sub { display: none; }
.icon-btn {
  background: var(--bg-elev-2); color: var(--txt); border: 1px solid var(--line);
  border-radius: 10px; height: 34px; min-width: 34px; padding: 0 12px;
  font-size: 13px; font-weight: 600; cursor: pointer;
}
.icon-btn:active { transform: scale(0.96); }
.icon-btn.hidden { display: none; }

/* ---------- View ---------- */
#view {
  flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch;
  padding: 16px 16px calc(var(--tabbar-h) + var(--safe-bot) + 24px);
}
.screen { animation: fade 0.18s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.screen-head { margin: 4px 2px 16px; }
.screen-head h1 { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; }
.screen-head .sub { color: var(--txt-dim); font-size: 14px; margin-top: 3px; }

.section-label { color: var(--txt-faint); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.6px; margin: 22px 4px 9px; }

/* ---------- Cards ---------- */
.card { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.card + .card { margin-top: 12px; }

/* ---------- Today: progress ring banner ---------- */
.day-banner {
  display: flex; align-items: center; justify-content: space-between;
  background: linear-gradient(135deg, #1a1a1d, #121214);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 16px;
}
.day-banner .d-name { font-size: 20px; font-weight: 800; }
.day-banner .d-meta { color: var(--txt-dim); font-size: 13px; margin-top: 2px; }
.ring { --p: 0; width: 52px; height: 52px; border-radius: 50%;
  background: conic-gradient(var(--accent) calc(var(--p) * 1%), var(--bg-elev-2) 0);
  display: grid; place-items: center; }
.ring::after { content: ""; width: 40px; height: 40px; border-radius: 50%; background: var(--bg-elev); position: absolute; }
.ring span { position: relative; z-index: 1; font-size: 12px; font-weight: 700; }
.ring-wrap { position: relative; display: grid; place-items: center; }

/* ---------- Exercise card (logging) ---------- */
.ex { padding: 0; }
.ex-head { display: flex; align-items: center; gap: 12px; padding: 14px 16px; cursor: pointer; }
.ex-head .ex-name { font-size: 16px; font-weight: 700; flex: 1; }
.ex-head .ex-tag { color: var(--txt-dim); font-size: 12px; }
.ex-head .chev { color: var(--txt-faint); font-size: 13px; transition: transform 0.2s; }
.ex.open .chev { transform: rotate(90deg); }
.ex-sub { color: var(--txt-dim); font-size: 12.5px; padding: 0 16px 0 16px; margin-top: -6px; }
.ex-done-pill { background: var(--done-dim); color: var(--done); font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 99px; }

.ex-body { display: none; padding: 4px 12px 14px; }
.ex.open .ex-body { display: block; }

.cues { background: var(--bg-elev-2); border-radius: var(--radius-sm); padding: 10px 12px; margin: 4px 4px 12px; }
.cues li { list-style: none; color: var(--txt-dim); font-size: 13px; padding-left: 16px; position: relative; line-height: 1.5; }
.cues li::before { content: ""; position: absolute; left: 2px; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.cues .video-link { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-size: 13px; font-weight: 600; margin-top: 9px; text-decoration: none; }

/* set rows */
.set-grid-head, .set-row {
  display: grid; grid-template-columns: 34px 1fr 1fr 56px 44px; gap: 8px; align-items: center;
}
.set-grid-head { padding: 2px 6px 8px; }
.set-grid-head span { color: var(--txt-faint); font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; text-align: center; }
.set-grid-head span:first-child { text-align: left; }
.set-row { padding: 5px 6px; }
.set-row .set-no { color: var(--txt-faint); font-weight: 700; font-size: 14px; text-align: center; }
.set-row input {
  width: 100%; background: var(--bg-elev-2); border: 1px solid var(--line); color: var(--txt);
  border-radius: 10px; height: 42px; text-align: center; font-size: 17px; font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.set-row input:focus { outline: none; border-color: var(--accent); }
.set-row input::placeholder { color: var(--txt-faint); font-weight: 500; }
.set-row .target { color: var(--txt-faint); font-size: 11px; text-align: center; }
.set-row .check {
  height: 42px; width: 42px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--bg-elev-2); color: var(--txt-faint); font-size: 18px; cursor: pointer; display: grid; place-items: center;
}
.set-row.done input { border-color: var(--done-dim); background: var(--done-dim); color: var(--done); }
.set-row.done .check { background: var(--done); border-color: var(--done); color: #08230f; }

.row-actions { display: flex; gap: 8px; margin: 10px 4px 0; }

/* ---------- buttons ---------- */
.btn {
  border: none; border-radius: 12px; height: 46px; font-size: 15px; font-weight: 700; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
}
.btn:active { transform: scale(0.985); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: var(--bg-elev-2); color: var(--txt); border: 1px solid var(--line); }
.btn-sm { height: 38px; font-size: 13px; border-radius: 10px; padding: 0 14px; width: auto; }
.btn-danger { background: var(--accent-dim); color: var(--accent); }
.btn-block { width: 100%; }

/* finish bar */
.finish-bar { margin-top: 22px; padding-bottom: 26px; }

/* ---------- Program screen ---------- */
.day-card { padding: 16px; }
.day-card .d-top { display: flex; align-items: center; justify-content: space-between; }
.day-card .d-top h3 { font-size: 17px; font-weight: 800; }
.day-card .d-count { color: var(--txt-dim); font-size: 12px; }
.day-card ul { list-style: none; margin-top: 10px; }
.day-card li { display: flex; justify-content: space-between; padding: 7px 0; border-top: 1px solid var(--line); font-size: 14px; }
.day-card li:first-child { border-top: none; }
.day-card li .vol { color: var(--txt-faint); font-size: 12px; font-variant-numeric: tabular-nums; }

/* ---------- Library ---------- */
.search { position: relative; margin-bottom: 6px; }
.search input {
  width: 100%; height: 46px; border-radius: 13px; background: var(--bg-elev); border: 1px solid var(--line);
  color: var(--txt); padding: 0 16px; font-size: 15px;
}
.search input:focus { outline: none; border-color: var(--accent); }
.chip-row { display: flex; gap: 8px; overflow-x: auto; padding: 10px 2px 4px; scrollbar-width: none; }
.chip-row::-webkit-scrollbar { display: none; }
.chip { white-space: nowrap; background: var(--bg-elev); border: 1px solid var(--line); color: var(--txt-dim);
  border-radius: 99px; padding: 8px 14px; font-size: 13px; font-weight: 600; cursor: pointer; }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.lib-row { display: flex; align-items: center; gap: 12px; padding: 13px 16px; cursor: pointer; }
.lib-row .l-name { flex: 1; font-weight: 600; font-size: 15px; }
.lib-row .l-meta { color: var(--txt-faint); font-size: 12px; }
.lib-row .eqp { background: var(--bg-elev-2); color: var(--txt-dim); font-size: 10.5px; font-weight: 700; padding: 3px 8px; border-radius: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.lib-row + .lib-row { border-top: 1px solid var(--line); }
.custom-dot { color: var(--accent); font-size: 16px; }

/* ---------- History ---------- */
.hist-card { padding: 15px 16px; }
.hist-card .h-top { display: flex; justify-content: space-between; align-items: baseline; }
.hist-card .h-day { font-weight: 800; font-size: 16px; }
.hist-card .h-date { color: var(--txt-dim); font-size: 13px; }
.hist-card .h-stats { color: var(--txt-dim); font-size: 13px; margin-top: 8px; display: flex; gap: 16px; }
.hist-card .h-stats b { color: var(--txt); font-variant-numeric: tabular-nums; }

/* ---------- empty states ---------- */
.empty { text-align: center; padding: 48px 24px; color: var(--txt-dim); }
.empty .e-ico { font-size: 34px; opacity: 0.4; }
.empty h3 { color: var(--txt); margin: 12px 0 6px; font-size: 17px; }
.empty p { font-size: 14px; line-height: 1.5; }

/* ---------- Tab bar ---------- */
#tabbar {
  height: calc(var(--tabbar-h) + var(--safe-bot)); padding-bottom: var(--safe-bot);
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); background: rgba(12,12,14,0.9);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px); z-index: 20;
}
.tab { background: none; border: none; color: var(--txt-faint); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; cursor: pointer; }
.tab-ico { font-size: 17px; line-height: 1; }
.tab-label { font-size: 10.5px; font-weight: 600; letter-spacing: 0.3px; }
.tab.active { color: var(--accent); }

/* ---------- Bottom sheet ---------- */
#sheet-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.55); z-index: 40; display: flex; align-items: flex-end; justify-content: center; }
#sheet-backdrop.hidden { display: none; }
#sheet { width: 100%; max-width: 560px; background: var(--bg-elev); border-radius: 22px 22px 0 0; border: 1px solid var(--line); border-bottom: none;
  max-height: 88dvh; overflow-y: auto; padding: 8px 18px calc(28px + var(--safe-bot)); animation: rise 0.22s ease; }
@keyframes rise { from { transform: translateY(100%); } to { transform: none; } }
.sheet-grip { width: 38px; height: 4px; border-radius: 99px; background: var(--line); margin: 8px auto 14px; }
.sheet-h { font-size: 20px; font-weight: 800; margin-bottom: 4px; }
.sheet-sub { color: var(--txt-dim); font-size: 13.5px; margin-bottom: 16px; }

.field { margin-bottom: 14px; }
.field label { display: block; color: var(--txt-dim); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg-elev-2); border: 1px solid var(--line); color: var(--txt);
  border-radius: 11px; padding: 12px 14px; font-size: 15px; font-family: inherit;
}
.field textarea { min-height: 78px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.sheet-actions { display: flex; gap: 10px; margin-top: 8px; }

.detail-cues li { list-style: none; color: var(--txt-dim); font-size: 14px; padding-left: 18px; position: relative; line-height: 1.6; }
.detail-cues li::before { content: ""; position: absolute; left: 3px; top: 10px; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }

/* ---------- toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + var(--safe-bot) + 18px); transform: translateX(-50%);
  background: var(--bg-elev-2); border: 1px solid var(--line); color: var(--txt);
  padding: 11px 18px; border-radius: 12px; font-size: 14px; font-weight: 600; z-index: 60;
  box-shadow: 0 8px 28px rgba(0,0,0,0.5); animation: pop 0.2s ease;
}
#toast.hidden { display: none; }
@keyframes pop { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

.hidden { display: none !important; }

/* ---------- polish pass (2026-06-17, research-driven, low-risk) ---------- */
/* ease the press-scale so taps feel responsive, not snappy */
.btn, .icon-btn, .chip, .check, .tab { transition: transform 0.1s ease-out; }
/* every displayed number uses tabular figures so nothing jiggles as it changes */
.ring span, .day-banner .d-meta, .day-card .d-count, .hist-card .h-date, .screen-head .sub { font-variant-numeric: tabular-nums; }

/* respect the OS reduce-motion setting */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Galaxy login ---------- */
.galaxy {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background:
    radial-gradient(2px 2px at 15% 18%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 26% 60%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.5px 1.5px at 40% 34%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 55% 80%, rgba(255,255,255,.45), transparent),
    radial-gradient(2px 2px at 70% 24%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 83% 54%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.5px 1.5px at 90% 78%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 33% 88%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 62% 48%, rgba(255,255,255,.35), transparent),
    radial-gradient(120% 90% at 50% -8%, rgba(45,90,160,.5), transparent 60%),
    radial-gradient(100% 80% at 82% 112%, rgba(30,60,120,.45), transparent 55%),
    linear-gradient(180deg, #0a1430, #06080f);
}
.auth-card { width: 100%; max-width: 360px; text-align: center; }
.auth-logo { width: 116px; height: 116px; object-fit: contain; margin: 0 auto 16px; display: block;
  filter: drop-shadow(0 6px 30px rgba(45,90,160,.6)); }
.auth-word { font-weight: 800; letter-spacing: 2px; font-size: 21px; color: #fff; }
.auth-tag { color: var(--txt-dim); font-size: 13px; margin: 7px 0 26px; letter-spacing: .4px; }
.auth-field { margin-bottom: 12px; }
.auth-field input {
  width: 100%; padding: 14px 16px; border-radius: 12px; font-size: 16px; color: #fff;
  border: 1px solid rgba(255,255,255,.16); background: rgba(255,255,255,.06);
}
.auth-field input::placeholder { color: var(--txt-faint); }
#auth-go { width: 100%; margin-top: 6px; }
.auth-err { color: #ff6b6b; font-size: 13px; margin-top: 12px; min-height: 16px; }

/* ---------- session exit / resume / teaching ---------- */
.back-btn { background: var(--bg-elev-2); color: var(--txt); border: 1px solid var(--line);
  width: 36px; height: 36px; border-radius: 10px; font-size: 22px; line-height: 1; flex: none;
  display: flex; align-items: center; justify-content: center; }
.resume-banner { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; padding: 14px 16px; }
.resume-banner .sub { color: var(--txt-dim); font-size: 13px; margin-top: 2px; }
.move-badge { font-size: 10px; font-weight: 800; letter-spacing: .4px; text-transform: uppercase;
  padding: 3px 7px; border-radius: 99px; border: 1px solid var(--line); color: var(--txt-dim);
  background: var(--bg-elev-2); cursor: pointer; white-space: nowrap; }
.move-badge.compound { color: var(--accent); border-color: var(--accent-dim); }
.prog-desc { color: var(--txt-dim); font-size: 13.5px; line-height: 1.55; padding: 13px 16px; }
.prog-desc b { color: var(--txt); }