/* ---------- Colors (light by default, dark via system or toggle) ---------- */
:root {
  --bg: #f5f4f8;
  --card: #ffffff;
  --text: #1d1b26;
  --muted: #6b6878;
  --border: #e3e0ea;
  --accent: #ffe58a;      /* pastel yellow fill */
  --accent-text: #3d3000; /* text on top of the fill */
  --accent-ink: #8a6500;  /* highlight color for text and borders */
  --accent-soft: #fff6cc; /* speech bubble */
  --ok: #1f9d63;
  --ok-soft: #dcf5e8;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14131a; --card: #1f1d28; --text: #eceaf3; --muted: #9a96a8;
    --border: #2f2c3a; --accent: #ffe58a; --accent-text: #2a2200; --accent-ink: #ffe58a; --accent-soft: #3a3420;
    --ok: #43c98a; --ok-soft: #173326; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14131a; --card: #1f1d28; --text: #eceaf3; --muted: #9a96a8;
  --border: #2f2c3a; --accent: #ffe58a; --accent-text: #2a2200; --accent-ink: #ffe58a; --accent-soft: #3a3420;
  --ok: #43c98a; --ok-soft: #173326; --shadow: none; color-scheme: dark;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
  -webkit-tap-highlight-color: transparent;
}
main { max-width: 640px; margin: 0 auto; padding: 0 16px; }
h1 { font-size: 1.15rem; margin: 0; }
h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 16px 0 8px; }
h3 { font-size: 1.05rem; margin: 0; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.tab { display: none; }
.tab.active { display: block; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px; margin: 14px 0; box-shadow: var(--shadow);
}

/* ---------- Buttons, chips, inputs ---------- */
.btn {
  font: inherit; font-weight: 600; border: 1px solid var(--border); background: var(--card);
  color: var(--text); border-radius: 10px; padding: 10px 14px; cursor: pointer;
}
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent-ink); }
.btn.danger { color: #d33; }
.btn.small { padding: 6px 10px; font-size: .85rem; }
.btn.wide { width: 100%; margin-top: 16px; }
.btn:disabled { opacity: .5; cursor: default; }
.icon-btn { font-size: 1.3rem; background: none; border: 0; cursor: pointer; padding: 4px 8px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: inherit; font-size: .92rem; padding: 7px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent-ink); color: var(--accent-text); font-weight: 600; }

input, select {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 10px; width: 100%; min-width: 0;
}
.row { display: flex; gap: 8px; margin-top: 8px; }

details > summary { cursor: pointer; font-weight: 600; }
#planner > summary { font-size: 1.05rem; }

/* ---------- Mascot ---------- */
.mascot-card { display: flex; align-items: flex-end; gap: 10px; margin-top: 14px; }
.mascot-img { width: auto; height: auto; max-width: 160px; max-height: 130px; flex: none; }
.bubble {
  position: relative; background: var(--accent-soft); color: var(--text);
  padding: 10px 14px; border-radius: 16px; margin: 0 0 20px; font-weight: 500;
}
.mascot-card .bubble::before {
  content: ""; position: absolute; left: -8px; bottom: 12px;
  border: 8px solid transparent; border-right-color: var(--accent-soft); border-left: 0;
}

/* ---------- Workout ---------- */
.workout-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.workout-head h2 { margin: 0; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.seg button { font: inherit; font-size: .85rem; border: 0; background: var(--card); color: var(--text); padding: 6px 10px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); }

.ex-head { display: flex; justify-content: space-between; gap: 8px; align-items: flex-start; }
.tag {
  display: inline-block; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: var(--accent-ink); margin-bottom: 2px;
}
.last { font-size: .82rem; color: var(--muted); margin: 2px 0 0; }

/* Two photos stacked; a timer toggles body.frame-b once a second */
.flip { position: relative; aspect-ratio: 3 / 2; margin: 12px 0 8px; border-radius: 10px; overflow: hidden; background: #fff; }
.flip img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; transition: opacity .12s; }
.flip img:nth-child(2) { opacity: 0; }
body.frame-b .flip img:nth-child(1) { opacity: 0; }
body.frame-b .flip img:nth-child(2) { opacity: 1; }

.instructions { margin: 8px 0; }
.instructions ol { padding-left: 20px; margin: 8px 0 0; font-size: .92rem; }
.instructions li { margin-bottom: 6px; }

.sets { width: 100%; border-collapse: collapse; margin-top: 8px; }
.sets th { font-size: .75rem; color: var(--muted); font-weight: 600; text-align: left; padding: 4px; }
.sets td { padding: 4px; }
.sets td:first-child { width: 28px; color: var(--muted); font-weight: 600; text-align: center; }
.sets td:last-child { width: 52px; }
.sets tr.done input { background: var(--ok-soft); border-color: var(--ok); }
.log-btn {
  width: 44px; height: 40px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); font-size: 1.1rem; cursor: pointer;
}
tr.done .log-btn { background: var(--ok); border-color: var(--ok); color: #fff; }
.shake { animation: shake .3s; border-color: #d33 !important; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

.ex-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.ex-actions .btn { flex: 1; }
.empty { text-align: center; padding: 24px 8px; }
.finish-row { display: flex; gap: 8px; margin: 16px 0 24px; }
.finish-row .btn { flex: 1; }

/* ---------- Library ---------- */
.lib-item { padding: 10px; }
.lib-row { display: flex; gap: 12px; align-items: center; cursor: pointer; }
.lib-row img { width: 72px; height: 48px; object-fit: cover; border-radius: 8px; background: #fff; flex: none; }
.lib-row .info { flex: 1; min-width: 0; }
.lib-row .name { font-weight: 600; }
.lib-row .meta { font-size: .8rem; color: var(--muted); text-transform: capitalize; }
.lib-detail { display: none; }
.lib-item.open .lib-detail { display: block; }

/* ---------- History ---------- */
.session h3 { display: flex; justify-content: space-between; gap: 8px; }
.session ul { margin: 8px 0 0; padding-left: 18px; font-size: .92rem; }
.session li { margin-bottom: 4px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); gap: 8px; margin-top: 10px; }
.stat { background: var(--bg); border-radius: 10px; padding: 8px; text-align: center; }
.stat b { display: block; font-size: 1.2rem; }
.stat span { font-size: .75rem; color: var(--muted); }

/* ---------- Rest bar, toast, tab bar ---------- */
.rest-bar {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(68px + env(safe-area-inset-bottom));
  width: min(608px, calc(100% - 32px)); z-index: 20;
  display: flex; align-items: center; gap: 10px; padding: 10px 14px; overflow: hidden;
  background: var(--card); border: 1px solid var(--accent-ink); border-radius: 14px; box-shadow: 0 4px 16px rgba(0,0,0,.18);
}
.rest-bar strong { font-size: 1.3rem; font-variant-numeric: tabular-nums; margin-right: auto; }
.rest-bar.over { background: var(--ok-soft); border-color: var(--ok); }
.rest-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; }
#restFill { height: 100%; background: var(--accent-ink); width: 100%; }

.toast {
  position: fixed; top: calc(60px + env(safe-area-inset-top)); left: 50%; transform: translateX(-50%);
  width: min(420px, calc(100% - 32px)); z-index: 30;
  display: flex; align-items: center; gap: 10px; padding: 8px 14px 8px 8px;
  background: var(--card); border: 1px solid var(--accent-ink); border-radius: 16px; box-shadow: 0 6px 20px rgba(0,0,0,.2);
  animation: pop .25s ease-out;
}
.toast img { width: auto; height: auto; max-width: 96px; max-height: 72px; flex: none; }
.toast p { margin: 0; font-weight: 600; }
@keyframes pop { from { transform: translate(-50%, -12px); opacity: 0; } }

.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 15;
  display: flex; justify-content: center;
  background: var(--card); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar button {
  flex: 1; max-width: 213px; font: inherit; font-size: .75rem; background: none; border: 0;
  color: var(--muted); padding: 8px 0 10px; cursor: pointer;
}
.tabbar button span { display: block; font-size: 1.35rem; }
.tabbar button.active { color: var(--accent-ink); font-weight: 700; }

/* ---------- Celebration ---------- */
.overlay {
  position: fixed; inset: 0; z-index: 50; background: rgba(10, 8, 16, .6);
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.overlay[hidden] { display: none; }
.celebrate-box {
  position: relative; overflow: hidden; width: min(420px, 100%); max-height: 100%; overflow-y: auto;
  background: var(--card); border-radius: 20px; padding: 20px; text-align: center;
  animation: pop2 .35s ease-out;
}
.celebrate-box h2 { font-size: 1.4rem; color: var(--accent-ink); text-transform: none; letter-spacing: 0; margin: 8px 0; }
.celebrate-box .bubble { margin: 8px 0; }
.celebrate-img { width: auto; height: auto; max-width: min(260px, 100%); max-height: 210px; }
@keyframes pop2 { from { transform: scale(.85); opacity: 0; } }
.confetti { position: absolute; inset: 0; pointer-events: none; }
.confetti i {
  position: absolute; top: -20px; width: 8px; height: 14px; border-radius: 2px;
  animation: fall 2.6s linear forwards;
}
@keyframes fall { to { transform: translateY(560px) rotate(540deg); opacity: 0; } }

/* Extra room at the bottom while the rest bar is showing */
body:has(#restBar:not([hidden])) { padding-bottom: calc(140px + env(safe-area-inset-bottom)); }