:root {
  --bg: #0b1020;
  --bg-2: #121a30;
  --card: #18223a;
  --card-2: #1f2b47;
  --line: #2a3654;
  --text: #eef2ff;
  --muted: #98a2c3;
  --accent: #ff7a1a;
  --accent-2: #ff9a4d;
  --ok: #2ecc71;
  --danger: #ff5c5c;
  --radius: 14px;
  --tabs-h: 64px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3 { margin: 0 0 .5rem; line-height: 1.2; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 .75rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
[hidden] { display: none !important; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(.6rem + var(--safe-t)) 1rem .6rem;
  background: rgba(11,16,32,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; }

.view {
  padding: 1rem 1rem calc(var(--tabs-h) + var(--safe-b) + 1.5rem);
  max-width: 720px; margin: 0 auto;
}

.tabs {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 20;
  display: grid; grid-template-columns: repeat(4, 1fr);
  height: calc(var(--tabs-h) + var(--safe-b));
  padding-bottom: var(--safe-b);
  background: rgba(11,16,32,.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.tab {
  background: none; border: 0; color: var(--muted);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; font-size: .75rem; font-weight: 600;
}
.tab-ico { font-size: 1.3rem; }
.tab.active { color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .7rem 1rem; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card-2); color: var(--text); font-weight: 600;
  transition: transform .08s ease, background .15s ease;
  user-select: none; -webkit-user-select: none;
}
.btn:active { transform: scale(.97); }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #1a0d00; }
.btn-ok { background: var(--ok); border-color: var(--ok); color: #05200f; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-ghost { background: transparent; }
.btn-sm { padding: .45rem .7rem; font-size: .85rem; border-radius: 10px; }
.btn-block { width: 100%; }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: 10px; }
.btn:disabled { opacity: .5; cursor: default; }

.row { display: flex; align-items: center; gap: .6rem; }
.row.between { justify-content: space-between; }
.row.wrap { flex-wrap: wrap; }
.stack { display: flex; flex-direction: column; gap: .75rem; }
.grow { flex: 1; min-width: 0; }
.mt { margin-top: 1rem; }
.mb { margin-bottom: 1rem; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .9rem 1rem;
}
.card.clickable { cursor: pointer; }
.card.clickable:active { background: var(--card-2); }

.section-head { display: flex; align-items: center; justify-content: space-between; margin: .25rem 0 .9rem; }

.empty { text-align: center; padding: 2.5rem 1rem; color: var(--muted); }
.empty .big { font-size: 2.5rem; margin-bottom: .5rem; }

label.field { display: block; margin-bottom: .75rem; }
label.field > span { display: block; font-size: .8rem; color: var(--muted); margin-bottom: .3rem; font-weight: 600; }
.input, select.input {
  width: 100%; padding: .7rem .8rem; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-2); color: var(--text);
  outline: none;
}
.input:focus { border-color: var(--accent); }
.input.num { text-align: center; padding: .55rem .4rem; -moz-appearance: textfield; }
.input.num::-webkit-outer-spin-button, .input.num::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.chip {
  display: inline-block; padding: .2rem .55rem; border-radius: 999px;
  background: var(--bg-2); border: 1px solid var(--line); font-size: .75rem; color: var(--muted);
}
.chip.accent { color: var(--accent); border-color: rgba(255,122,26,.4); }
.chip.ok { color: var(--ok); border-color: rgba(46,204,113,.4); }

.thumb {
  width: 64px; height: 64px; border-radius: 10px; object-fit: cover; background: #fff; flex: none;
}
.thumb.sm { width: 44px; height: 44px; border-radius: 8px; }
.media-box {
  position: relative; width: 100%; aspect-ratio: 1 / 1; max-height: 52vh;
  border-radius: var(--radius); overflow: hidden; background: #fff;
  display: grid; place-items: center;
}
.media-box video, .media-box img { width: 100%; height: 100%; object-fit: contain; display: block; }
.media-box.dark { background: #111; }

.ex-list { display: grid; gap: .6rem; }
.ex-item { display: flex; align-items: center; gap: .75rem; }
.ex-item .name { font-weight: 600; }
.ex-item .meta { font-size: .8rem; color: var(--muted); }
.ex-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .75rem; }
.ex-tile { padding: 0; overflow: hidden; text-align: left; }
.ex-tile img { width: 100%; aspect-ratio: 1/1; object-fit: cover; background: #fff; display: block; }
.ex-tile .name { padding: .55rem .7rem .65rem; font-weight: 600; font-size: .9rem; }
.ex-tile .muscle { display: block; font-size: .75rem; color: var(--muted); font-weight: 400; }

/* Routine editor rows */
.edit-row { display: grid; grid-template-columns: 44px 1fr auto; gap: .6rem; align-items: center; }
.edit-row .sr { display: flex; align-items: center; gap: .3rem; }
.edit-row .sr input { width: 52px; }
.edit-row .ctrls { display: flex; gap: .25rem; grid-column: 1 / -1; justify-content: flex-end; }

/* Workout */
.workout-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .75rem; }
.progress-bar { height: 6px; background: var(--bg-2); border-radius: 999px; overflow: hidden; margin: .5rem 0 1rem; }
.progress-bar > div { height: 100%; background: var(--accent); transition: width .2s ease; }
.set-table { display: grid; gap: .5rem; margin-top: .75rem; }
.set-row {
  display: grid; grid-template-columns: 40px 1fr 1fr 48px; gap: .5rem; align-items: center;
  padding: .45rem .5rem; border-radius: 12px; background: var(--bg-2); border: 1px solid var(--line);
}
.set-row.done { border-color: rgba(46,204,113,.5); background: rgba(46,204,113,.08); }
.set-row .idx { text-align: center; font-weight: 700; color: var(--muted); }
.set-row .done-btn {
  width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card-2); font-size: 1.2rem;
}
.set-row.done .done-btn { background: var(--ok); border-color: var(--ok); color: #05200f; }
.set-head { display: grid; grid-template-columns: 40px 1fr 1fr 48px; gap: .5rem; font-size: .75rem; color: var(--muted); text-align: center; font-weight: 600; padding: 0 .5rem; }
.last-time { font-size: .85rem; color: var(--muted); margin-top: .5rem; }
.last-time b { color: var(--text); }
.rest {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(var(--tabs-h) + var(--safe-b) + 12px); z-index: 25;
  background: var(--card-2); border: 1px solid var(--accent); border-radius: 999px;
  padding: .5rem .6rem .5rem 1rem; display: flex; align-items: center; gap: .6rem;
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
}
.rest .t { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 1.15rem; color: var(--accent); min-width: 3.2ch; }
.workout-nav { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin-top: 1rem; }

/* History */
.session-card .date { font-weight: 700; }
.session-card .details { margin-top: .6rem; border-top: 1px solid var(--line); padding-top: .6rem; }
.session-card .ex-line { display: flex; justify-content: space-between; gap: .5rem; padding: .25rem 0; font-size: .9rem; }
.session-card .ex-line .sets { color: var(--muted); text-align: right; }

/* Progress */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; margin: .75rem 0; }
.stat { background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: .6rem; text-align: center; }
.stat .v { font-size: 1.25rem; font-weight: 800; color: var(--accent); }
.stat .l { font-size: .72rem; color: var(--muted); }
.chart { width: 100%; height: auto; display: block; }
.chart text { fill: var(--muted); font-size: 11px; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.chart .line.alt { stroke: #4da3ff; }
.chart .dot { fill: var(--accent); }
.chart .dot.alt { fill: #4da3ff; }
.legend { display: flex; gap: 1rem; font-size: .8rem; color: var(--muted); margin-top: .4rem; }
.legend i { display: inline-block; width: 12px; height: 3px; border-radius: 2px; background: var(--accent); vertical-align: middle; margin-right: .3rem; }
.legend i.alt { background: #4da3ff; }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 40; background: rgba(0,0,0,.6);
  display: flex; align-items: flex-end; justify-content: center;
}
.modal {
  width: 100%; max-width: 720px; max-height: 88vh; overflow: auto;
  background: var(--card); border-radius: 18px 18px 0 0; border: 1px solid var(--line);
  padding: 1rem 1rem calc(1rem + var(--safe-b));
  animation: up .18s ease-out;
}
@keyframes up { from { transform: translateY(30px); opacity: 0 } to { transform: none; opacity: 1 } }
.modal .grab { width: 40px; height: 4px; border-radius: 2px; background: var(--line); margin: 0 auto .8rem; }

.toast {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(var(--tabs-h) + var(--safe-b) + 14px); z-index: 50;
  background: var(--text); color: var(--bg); padding: .6rem 1rem; border-radius: 999px;
  font-weight: 600; font-size: .9rem; box-shadow: 0 8px 24px rgba(0,0,0,.35);
}

.pr-badge { color: var(--ok); font-weight: 700; }
@media (min-width: 640px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
  .edit-row .ctrls { grid-column: auto; }
  .edit-row { grid-template-columns: 44px 1fr auto auto; }
}

/* Ajustes: espacio extra mientras corre el descanso, grid 2x2 para 4 estadísticas, título de entrenamiento en una línea */
body.resting .view { padding-bottom: calc(var(--tabs-h) + var(--safe-b) + 5.5rem); }
.stats.four { grid-template-columns: repeat(2, 1fr); }
.workout-head .title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (min-width: 640px) { .stats.four { grid-template-columns: repeat(4, 1fr); } }
.notes { color: var(--accent-2); margin-top: .35rem; line-height: 1.35; }
textarea.input { resize: vertical; min-height: 2.5rem; }
.media-box.wide { aspect-ratio: 16 / 9; }

/* Interruptor (checkbox estilizado) */
.switch { appearance: none; -webkit-appearance: none; width: 48px; height: 28px; border-radius: 999px; background: var(--line); position: relative; flex: none; cursor: pointer; transition: background .15s; margin: 0; }
.switch::after { content: ''; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: #fff; transition: transform .15s; }
.switch:checked { background: var(--accent); }
.switch:checked::after { transform: translateX(20px); }
.modal .card { background: var(--bg-2); }
.media-box.placeholder { aspect-ratio: 16 / 5; }

/* Fichas técnicas y filas de ejercicio pulsables */
.ex-item-btn { width: 100%; text-align: left; background: none; border: 0; padding: .35rem .4rem; border-radius: 10px; color: inherit; }
.ex-item-btn:active { background: var(--card-2); }
.info-desc { margin: 0 0 .4rem; }
details.info { border: 1px solid var(--line); border-radius: 10px; margin-top: .5rem; background: var(--bg-2); }
details.info summary { cursor: pointer; padding: .6rem .8rem; font-weight: 600; list-style: none; display: flex; justify-content: space-between; }
details.info summary::-webkit-details-marker { display: none; }
details.info summary::after { content: '+'; color: var(--muted); }
details.info[open] summary::after { content: '−'; }
.info-list { margin: 0; padding: 0 .9rem .7rem 1.8rem; }
.info-list li { margin: .25rem 0; line-height: 1.35; }
.info-list.err li::marker { color: var(--danger); }
.info-list a { color: var(--accent-2); }

/* Columna "Anterior" en la tabla de series (kilos y reps de la última sesión) */
.set-table.with-prev .set-row, .set-table.with-prev .set-head { grid-template-columns: 32px 64px 1fr 1fr 44px; gap: .4rem; }
.set-row .prev {
  background: transparent; border: 1px dashed var(--line); border-radius: 10px; color: var(--muted);
  font-size: .72rem; line-height: 1.15; padding: .3rem .2rem; text-align: center; min-height: 44px;
}
.set-row .prev b { color: var(--accent-2); font-size: .85rem; }
.set-row .prev .u { font-size: .65rem; }
.set-row .prev.empty { border-style: dotted; opacity: .5; }
.set-row .prev:not(.empty):active { background: var(--card-2); }