/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0f0f14;
  --surface:    #1a1a24;
  --surface2:   #242432;
  --border:     #2e2e42;
  --run:        #22c55e;
  --run-dim:    #15803d;
  --walk:       #3b82f6;
  --walk-dim:   #1d4ed8;
  --warmup:     #f59e0b;
  --cooldown:   #8b5cf6;
  --text:       #f1f5f9;
  --text-dim:   #94a3b8;
  --accent:     #6366f1;
  --danger:     #ef4444;
  --radius:     14px;
  --radius-sm:  8px;
}

html { font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100dvh;
  overscroll-behavior: none;
}

/* ===== LAYOUT ===== */
.app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 80px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ===== HEADER ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0 4px;
}
.header h1 {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.header h1 span { color: var(--accent); }

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

/* ===== WEEK/DAY SELECTOR ===== */
.selector-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.selector-group label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
select {
  width: 100%;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 1rem;
  font-weight: 600;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
}
select:focus { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ===== SCHEDULE SUMMARY ===== */
.summary-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.summary-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chip {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 99px;
  white-space: nowrap;
}
.chip.run      { background: #15803d33; color: var(--run);      border: 1px solid #15803d66; }
.chip.walk     { background: #1d4ed833; color: var(--walk);     border: 1px solid #1d4ed866; }
.chip.warmup   { background: #92400e33; color: var(--warmup);   border: 1px solid #92400e66; }
.chip.cooldown { background: #5b21b633; color: var(--cooldown); border: 1px solid #5b21b666; }
.chip.easy     { background: #16653033; color: #4ade80;         border: 1px solid #16653066; }
.chip.tempo    { background: #c2410c33; color: #fb923c;         border: 1px solid #c2410c66; }
.chip.speed    { background: #9f123933; color: #f472b6;         border: 1px solid #9f123966; }
.chip.race     { background: #a1620033; color: #fbbf24;         border: 1px solid #a1620066; }

/* ===== YOUTUBE INPUT ===== */
.yt-input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}
.yt-input-row input {
  flex: 1;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 0.95rem;
}
.yt-input-row input::placeholder { color: var(--text-dim); }
.yt-input-row input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-load {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-load:active { opacity: 0.8; }

/* ===== YOUTUBE PLAYER ===== */
.yt-player-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.yt-player-wrap iframe,
.yt-player-wrap #yt-player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.yt-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  gap: 8px;
  font-size: 0.9rem;
}
.yt-placeholder svg { opacity: 0.3; }

/* ===== MAIN STATUS DISPLAY ===== */
.status-card {
  text-align: center;
  padding: 24px 16px;
  transition: background 0.4s, border-color 0.4s;
}
.status-card.run      { background: #15803d1a; border-color: #15803d66; }
.status-card.walk     { background: #1d4ed81a; border-color: #1d4ed866; }
.status-card.warmup   { background: #92400e1a; border-color: #92400e66; }
.status-card.cooldown { background: #5b21b61a; border-color: #5b21b666; }
.status-card.easy     { background: #16653020; border-color: #16653066; }
.status-card.tempo    { background: #c2410c1a; border-color: #c2410c66; }
.status-card.speed    { background: #9f12391a; border-color: #9f123966; }
.status-card.race     { background: #a162001a; border-color: #a1620066; }
.status-card.idle     { background: var(--surface); border-color: var(--border); }

.status-icon { font-size: 2.5rem; margin-bottom: 4px; }
.status-label {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1;
  transition: color 0.4s;
}
.status-label.run      { color: var(--run); }
.status-label.walk     { color: var(--walk); }
.status-label.warmup   { color: var(--warmup); }
.status-label.cooldown { color: var(--cooldown); }
.status-label.easy     { color: #4ade80; }
.status-label.tempo    { color: #fb923c; }
.status-label.speed    { color: #f472b6; }
.status-label.race     { color: #fbbf24; }
.status-label.idle     { color: var(--text-dim); }

.timer-display {
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
  margin: 8px 0 4px;
  line-height: 1;
}
.interval-progress {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin: 12px 0 8px;
  overflow: hidden;
}
.interval-progress-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s linear, background 0.4s;
}
.run      .interval-progress-bar { background: var(--run); }
.walk     .interval-progress-bar { background: var(--walk); }
.warmup   .interval-progress-bar { background: var(--warmup); }
.cooldown .interval-progress-bar { background: var(--cooldown); }
.easy     .interval-progress-bar { background: #4ade80; }
.tempo    .interval-progress-bar { background: #fb923c; }
.speed    .interval-progress-bar { background: #f472b6; }
.race     .interval-progress-bar { background: #fbbf24; }

.next-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
}
.next-label strong { color: var(--text); }

/* ===== OVERALL PROGRESS ===== */
.overall-progress-wrap {
  margin-top: 4px;
}
.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.progress-meta strong { color: var(--text); }
.overall-progress {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.overall-progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.5s linear;
}

/* interval timeline */
.timeline {
  display: flex;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin-top: 6px;
  gap: 1px;
}
.tl-seg {
  height: 100%;
  transition: opacity 0.3s;
  border-radius: 2px;
}
.tl-seg.run      { background: var(--run); }
.tl-seg.walk     { background: var(--walk); }
.tl-seg.warmup   { background: var(--warmup); }
.tl-seg.cooldown { background: var(--cooldown); }
.tl-seg.easy     { background: #4ade80; }
.tl-seg.tempo    { background: #fb923c; }
.tl-seg.speed    { background: #f472b6; }
.tl-seg.race     { background: #fbbf24; }
.tl-seg.done     { opacity: 0.3; }
.tl-seg.active   { opacity: 1; box-shadow: 0 0 4px currentColor; }
.tl-seg.upcoming { opacity: 0.5; }

/* ===== CONTROLS ===== */
.controls {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.btn {
  flex: 1;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--run); color: #fff; }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-reset { background: var(--surface2); color: var(--text-dim); border: 1px solid var(--border); flex: 0 0 auto; padding: 16px 20px; }
.btn-download { background: var(--accent); color: #fff; }

/* ===== AUDIO SECTION ===== */
.audio-section { display: flex; flex-direction: column; gap: 8px; }
.audio-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.audio-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.toggle-label { font-size: 0.9rem; font-weight: 500; }
.toggle {
  position: relative;
  width: 46px;
  height: 26px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 13px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}
.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }

/* volume slider */
input[type=range] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ===== SECTION HEADERS ===== */
.section-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 99px;
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
  z-index: 100;
  white-space: nowrap;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== BOTTOM NAV SPACER ===== */
.bottom-spacer { height: 16px; }

/* ===== DESKTOP ===== */
@media (min-width: 640px) {
  .app { padding: 24px 24px 40px; }
  .timer-display { font-size: 4.5rem; }
  .status-label { font-size: 2.8rem; }
}