:root {
  --bg: #0b0d12;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-border: rgba(255, 255, 255, 0.08);
  --text: #eef1f7;
  --text-dim: #8a91a3;
  --accent-focus: #ff6b6b;
  --accent-short: #4ecdc4;
  --accent-long: #6c9fff;
  --ring-track: rgba(255, 255, 255, 0.07);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: background 0.8s ease;
}

body.mode-short-break {
  background: #0a1210;
}

body.mode-long-break {
  background: #0a0f18;
}

/* ---------- animated background orbs ---------- */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.35;
  pointer-events: none;
  animation: drift 18s ease-in-out infinite alternate;
}

.orb-1 {
  width: 480px;
  height: 480px;
  top: -140px;
  left: -120px;
  background: var(--accent-focus);
}

.orb-2 {
  width: 420px;
  height: 420px;
  bottom: -160px;
  right: -100px;
  background: #845ef7;
  animation-delay: -6s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  bottom: 10%;
  left: 12%;
  background: var(--accent-long);
  animation-delay: -12s;
  opacity: 0.2;
}

body.mode-short-break .orb-1 { background: var(--accent-short); }
body.mode-short-break .orb-2 { background: #2b9348; }
body.mode-long-break .orb-1 { background: var(--accent-long); }
body.mode-long-break .orb-2 { background: #5f72ff; }

@keyframes drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(70px, 50px) scale(1.15);
  }
}

/* ---------- layout ---------- */
.app {
  position: relative;
  z-index: 1;
  width: min(480px, calc(100vw - 32px));
  padding: 24px 0 40px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-focus);
  box-shadow: 0 0 16px var(--accent-focus);
  animation: pulse 2s ease-in-out infinite;
}

body.mode-short-break .logo-dot { background: var(--accent-short); box-shadow: 0 0 16px var(--accent-short); }
body.mode-long-break .logo-dot { background: var(--accent-long); box-shadow: 0 0 16px var(--accent-long); }

.logo h1 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.2s, transform 0.2s;
}

.icon-btn:hover {
  color: var(--text);
  transform: rotate(30deg);
}

/* ---------- mode tabs ---------- */
.modes {
  display: flex;
  gap: 6px;
  padding: 6px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(20px);
  margin-bottom: 28px;
}

.mode-btn {
  flex: 1;
  padding: 10px 0;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dim);
  background: transparent;
  border: none;
  border-radius: 11px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.mode-btn:hover {
  color: var(--text);
}

.mode-btn.active {
  background: var(--accent-focus);
  color: #14161c;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(255, 107, 107, 0.35);
}

body.mode-short-break .mode-btn.active {
  background: var(--accent-short);
  box-shadow: 0 4px 20px rgba(78, 205, 196, 0.35);
}

body.mode-long-break .mode-btn.active {
  background: var(--accent-long);
  box-shadow: 0 4px 20px rgba(108, 159, 255, 0.35);
}

/* ---------- timer card ---------- */
.timer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding: 36px 24px 28px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(24px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.ring-wrap {
  position: relative;
  width: 320px;
  height: 320px;
  max-width: 100%;
}

.progress-ring {
  transform: rotate(-90deg);
}

.ring-track,
.ring-progress {
  fill: none;
  stroke-width: 10;
  stroke-linecap: round;
}

.ring-track {
  stroke: var(--ring-track);
}

.ring-progress {
  stroke: var(--accent-focus);
  stroke-dasharray: 879.6;
  stroke-dashoffset: 0;
  filter: drop-shadow(0 0 10px rgba(255, 107, 107, 0.55));
  transition: stroke-dashoffset 0.4s linear, stroke 0.5s ease;
}

body.mode-short-break .ring-progress {
  stroke: var(--accent-short);
  filter: drop-shadow(0 0 10px rgba(78, 205, 196, 0.55));
}

body.mode-long-break .ring-progress {
  stroke: var(--accent-long);
  filter: drop-shadow(0 0 10px rgba(108, 159, 255, 0.55));
}

.timer-display {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.timer-display span:first-child {
  font-size: 4rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

#phase-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

/* ---------- controls ---------- */
.controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: 14px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  min-width: 170px;
  padding: 15px 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #14161c;
  background: var(--accent-focus);
  box-shadow: 0 8px 26px rgba(255, 107, 107, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 10px 32px rgba(255, 107, 107, 0.55);
  transform: translateY(-1px);
}

body.mode-short-break .btn-primary {
  background: var(--accent-short);
  box-shadow: 0 8px 26px rgba(78, 205, 196, 0.4);
}

body.mode-long-break .btn-primary {
  background: var(--accent-long);
  box-shadow: 0 8px 26px rgba(108, 159, 255, 0.4);
}

.btn-secondary {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.25);
}

/* ---------- session info ---------- */
.session-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.dots {
  display: flex;
  gap: 10px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  transition: all 0.3s ease;
}

.dot.done {
  background: var(--accent-focus);
  box-shadow: 0 0 10px rgba(255, 107, 107, 0.6);
}

#session-count {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ---------- settings panel ---------- */
.settings-panel {
  margin-top: 20px;
  padding: 22px;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(24px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-panel.hidden {
  display: none;
}

.settings-panel h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.setting-row label {
  font-size: 0.88rem;
  color: var(--text-dim);
}

.setting-row input[type="number"] {
  width: 76px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text);
  text-align: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s;
}

.setting-row input[type="number"]:focus {
  border-color: var(--accent-focus);
}

.setting-row input[type="checkbox"] {
  appearance: none;
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  position: relative;
  cursor: pointer;
  transition: background 0.25s;
}

.setting-row input[type="checkbox"]::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s;
}

.setting-row input[type="checkbox"]:checked {
  background: var(--accent-focus);
}

.setting-row input[type="checkbox"]:checked::after {
  transform: translateX(20px);
}

@media (max-width: 400px) {
  .ring-wrap {
    width: 260px;
    height: 260px;
  }

  .progress-ring {
    width: 260px;
    height: 260px;
  }

  .timer-display span:first-child {
    font-size: 3.2rem;
  }
}