/* ── Reset & base ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-pomodoro:    #A77BCA;
  --clr-short:       #7BCAC4;
  --clr-long:        #5BADB8;
  --clr-bg:          #130f1a;
  --clr-surface:     #1c1528;
  --clr-card:        #271a3a;
  --clr-text:        #eaeaea;
  --clr-muted:       #9188a4;
  --clr-accent:      var(--clr-pomodoro);
  --ring-circumference: 603.19; /* 2π × 96 */
  --transition: .35s cubic-bezier(.4,0,.2,1);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: clamp(1rem, 4vw, 2rem) clamp(.75rem, 4vw, 1rem) clamp(2rem, 6vw, 4rem);
}

/* ── App shell ────────────────────────────────────── */
.app {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.5rem);
}

/* ── Header ───────────────────────────────────────── */
.header { width: 100%; text-align: center; }
.logo { font-size: 1.5rem; font-weight: 700; letter-spacing: .05em; }

/* ── Mode tabs ────────────────────────────────────── */
.mode-tabs {
  display: flex;
  background: var(--clr-surface);
  border-radius: 2rem;
  padding: .25rem;
  gap: .25rem;
  width: 100%;
}

.tab {
  flex: 1;
  padding: .55rem 0;
  border: none;
  background: transparent;
  color: var(--clr-muted);
  border-radius: 1.75rem;
  font-size: clamp(.7rem, 2.8vw, .875rem);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.tab.active {
  background: var(--clr-accent);
  color: #fff;
}

/* ── Timer card ───────────────────────────────────── */
.timer-card {
  position: relative;
  width: min(240px, 68vw);
  height: min(240px, 68vw);
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--clr-surface);
  stroke-width: 10;
}

.ring-fill {
  fill: none;
  stroke: var(--clr-accent);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: var(--ring-circumference);
  stroke-dashoffset: var(--ring-circumference);
  transition: stroke-dashoffset .9s ease, stroke .35s ease;
}

.timer-display {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .25rem;
  z-index: 1;
}

#timerDisplay {
  font-size: clamp(2.2rem, 13vw, 3.5rem);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1;
}

.mode-label {
  font-size: .85rem;
  color: var(--clr-muted);
  text-transform: uppercase;
  letter-spacing: .12em;
}

/* ── Controls ─────────────────────────────────────── */
.controls {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.btn-main {
  padding: .85rem clamp(1.75rem, 8vw, 3rem);
  border: none;
  border-radius: 3rem;
  background: var(--clr-accent);
  color: #fff;
  font-size: clamp(1rem, 4vw, 1.1rem);
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,.3);
}
.btn-main:hover { filter: brightness(1.12); transform: translateY(-1px); }
.btn-main:active { transform: translateY(0); }

.btn-icon {
  width: 44px;
  height: 44px;
  border: 2px solid var(--clr-surface);
  border-radius: 50%;
  background: transparent;
  color: var(--clr-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.btn-icon:hover { color: var(--clr-text); border-color: var(--clr-muted); }
.btn-icon svg { width: 18px; height: 18px; }

.session-count {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: .75rem;
  color: var(--clr-muted);
  gap: .2rem;
}
#sessionDots { font-size: .9rem; letter-spacing: .1em; }

/* ── Music section ────────────────────────────────── */
.music-section {
  width: 100%;
  background: var(--clr-surface);
  border-radius: 1rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.music-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.music-title { font-size: .95rem; font-weight: 600; }

.btn-link {
  background: none;
  border: none;
  color: var(--clr-accent);
  font-size: .8rem;
  cursor: pointer;
  text-decoration: underline;
}

.custom-url-row {
  display: flex;
  gap: .5rem;
}

.url-input {
  flex: 1;
  padding: .45rem .75rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-muted);
  border-radius: .5rem;
  color: var(--clr-text);
  font-size: .85rem;
}
.url-input:focus { outline: none; border-color: var(--clr-accent); }

.btn-apply {
  padding: .45rem 1rem;
  background: var(--clr-accent);
  border: none;
  border-radius: .5rem;
  color: #fff;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-apply:hover { filter: brightness(1.12); }

.player-presets {
  display: flex;
  gap: .5rem;
}

.preset-btn {
  flex: 1;
  padding: .4rem 0;
  background: var(--clr-card);
  border: 2px solid transparent;
  border-radius: .5rem;
  color: var(--clr-muted);
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.preset-btn:hover { color: var(--clr-text); }
.preset-btn.active {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
}

.player-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  border-radius: .75rem;
  overflow: hidden;
  background: #000;
}

/* YT IFrame API injects <iframe> inside #youtubePlayer div */
#youtubePlayer {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
}

#youtubePlayer iframe,
.player-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  border: none;
}

/* ── Mode colour theming ──────────────────────────── */
.app[data-mode="shortBreak"] { --clr-accent: var(--clr-short); }
.app[data-mode="longBreak"]  { --clr-accent: var(--clr-long); }

/* ── Notification flash ───────────────────────────── */
@keyframes flash {
  0%, 100% { opacity: 1; }
  50%       { opacity: .4; }
}
.flashing { animation: flash .5s 3; }

/* ── Small screen overrides ──────────────────────── */
@media (max-width: 380px) {
  .mode-tabs { padding: .15rem; gap: .15rem; }
  .tab { padding: .45rem 0; }
  .controls { gap: .85rem; }
  .player-presets { gap: .35rem; }
  .preset-btn { font-size: .72rem; padding: .35rem 0; }
  .music-section { padding: .75rem; }
}