/* ==========================================================================
   CHRONOS — Premium Stopwatch
   Design tokens, layout, and motion. Dark theme is the default identity;
   light theme is a faithful inversion of the same tokens.
   ========================================================================== */

:root{
  /* ---- Color: deep space navy + violet/mint duotone accent ---- */
  --bg-0: #060911;
  --bg-1: #0b1020;
  --bg-2: #131a2e;
  --blob-a: #424242;
  --blob-b: #7e7e7e;
  --blob-c: #ffffff;

  --accent-1: #7c6fff;
  --accent-2: #38e8c6;
  --accent-gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));

  --success: #35e0a0;
  --danger: #ff5c72;
  --warning: #ffb454;

  --glass-bg: rgba(255,255,255,0.055);
  --glass-bg-strong: rgba(255,255,255,0.09);
  --glass-border: rgba(255,255,255,0.10);
  --glass-shadow: 0 20px 60px -20px rgba(0,0,0,0.65), inset 0 1px 0 rgba(255,255,255,0.06);

  --text-primary: #f3f5fb;
  --text-secondary: #98a2b8;
  --text-tertiary: #616d84;

  --track-color: rgba(255,255,255,0.08);

  /* ---- Type ---- */
  --font-ui: 'Poppins', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* ---- Shape / motion ---- */
  --radius-lg: 32px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
}

/* Light theme: same structure, inverted surface + softened accents */
:root[data-theme="light"]{
  --bg-0: #eef1f8;
  --bg-1: #e7ebf5;
  --bg-2: #dde3f0;
  --blob-a: #a9a0ff;
  --blob-b: #9bead9;
  --blob-c: #ffc2d1;

  --glass-bg: rgba(255,255,255,0.55);
  --glass-bg-strong: rgba(255,255,255,0.75);
  --glass-border: rgba(20,25,40,0.08);
  --glass-shadow: 0 20px 50px -22px rgba(30,40,70,0.25), inset 0 1px 0 rgba(255,255,255,0.6);

  --text-primary: #171b28;
  --text-secondary: #4b5468;
  --text-tertiary: #7b8399;

  --track-color: rgba(20,25,45,0.08);
}

*, *::before, *::after{ box-sizing: border-box; }

html, body{
  height: 100%;
  margin: 0;
}

body{
  font-family: var(--font-ui);
  color: var(--text-primary);
  background: var(--bg-0);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background .5s var(--ease-out), color .5s var(--ease-out);
}

::selection{ background: var(--accent-1); color: #fff; }

/* Visible, high-contrast focus ring everywhere */
:focus-visible{
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 8px;
}

.sr-only{
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   Ambient background — slow drifting gradient blobs behind glass
   ========================================================================== */
.bg-mesh{
  position: fixed; inset: 0; z-index: -1;
  overflow: hidden;
  background: radial-gradient(120% 120% at 50% -10%, var(--bg-2), var(--bg-0) 60%);
}
.mesh-blob{
  position: absolute;
  width: 46vmax; height: 46vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .35;
  will-change: transform;
}
:root[data-theme="light"] .mesh-blob{ opacity: .28; filter: blur(80px); }
.blob-1{ background: var(--blob-a); top: -14%; left: -12%; animation: drift1 26s ease-in-out infinite; }
.blob-2{ background: var(--blob-b); bottom: -18%; right: -10%; animation: drift2 32s ease-in-out infinite; }
.blob-3{ background: var(--blob-c); top: 35%; left: 55%; opacity: .18; animation: drift3 40s ease-in-out infinite; }

@keyframes drift1{
  0%,100%{ transform: translate(0,0) scale(1); }
  50%{ transform: translate(8vw, 6vh) scale(1.15); }
}
@keyframes drift2{
  0%,100%{ transform: translate(0,0) scale(1); }
  50%{ transform: translate(-6vw, -8vh) scale(1.1); }
}
@keyframes drift3{
  0%,100%{ transform: translate(0,0) scale(1); }
  50%{ transform: translate(-5vw, 5vh) scale(1.2); }
}

/* ==========================================================================
   Layout shell
   ========================================================================== */
.app{
  max-width: 620px;
  margin: 0 auto;
  padding: 28px 20px 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 22px;
  animation: appEnter .7s var(--ease-out) both;
}

@keyframes appEnter{
  from{ opacity: 0; transform: translateY(14px) scale(.99); }
  to{ opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Top bar ---- */
.topbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: .2px;
}
.brand-mark{
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--accent-gradient);
  color: #0b1020;
  font-size: 15px;
  box-shadow: 0 6px 16px -6px rgba(124,111,255,.6);
}
.brand-name{ font-size: 17px; }

.topbar-actions{ display: flex; gap: 8px; }

.icon-btn{
  width: 40px; height: 40px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text-secondary);
  display: grid; place-items: center;
  cursor: pointer;
  font-size: 15px;
  transition: transform .2s var(--ease-spring), background .2s, color .2s, border-color .2s;
}
.icon-btn:hover{ color: var(--text-primary); transform: translateY(-2px); border-color: var(--accent-1); }
.icon-btn:active{ transform: translateY(0) scale(.94); }

/* ==========================================================================
   Glass card base
   ========================================================================== */
.glass-card{
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  transition: background .5s var(--ease-out), border-color .5s var(--ease-out);
}

.stage{
  display: flex;
  flex-direction: column;
  gap: 22px;
  flex: 1;
}

/* ==========================================================================
   Timer card
   ========================================================================== */
.timer-card{
  padding: 30px 24px 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}

.status-row{ display: flex; justify-content: center; }

.status-pill{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .3px;
  color: var(--text-secondary);
  text-transform: uppercase;
}
.status-dot{
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-tertiary);
  transition: background .3s;
}
.status-pill.running .status-dot{
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(53,224,160,.6);
  animation: pulseDot 1.4s ease-out infinite;
}
.status-pill.paused .status-dot{ background: var(--warning); }
.status-pill.running{ color: var(--success); }
.status-pill.paused{ color: var(--warning); }

@keyframes pulseDot{
  0%{ box-shadow: 0 0 0 0 rgba(53,224,160,.55); }
  70%{ box-shadow: 0 0 0 9px rgba(53,224,160,0); }
  100%{ box-shadow: 0 0 0 0 rgba(53,224,160,0); }
}

/* ---- Ring + display ---- */
.ring-wrap{
  position: relative;
  width: min(70vw, 280px);
  height: min(70vw, 280px);
  display: grid;
  place-items: center;
}

.ring-rotator{
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), transparent 55%, transparent 100%);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 5px));
  opacity: 0;
  transition: opacity .4s var(--ease-out);
}
.ring-rotator.spin{
  opacity: 1;
  animation: spin 2.2s linear infinite;
}
@keyframes spin{ to{ transform: rotate(360deg); } }

.ring-svg{ position: absolute; inset: 0; width: 100%; height: 100%; }
.ring-track{
  fill: none;
  stroke: var(--track-color);
  stroke-width: 5;
}

.display{
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(30px, 7vw, 42px);
  color: var(--text-primary);
  letter-spacing: 1px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  text-align: center;
}
.time-colon{ opacity: .45; margin: 0 1px; }
.time-ms{
  font-size: .5em;
  color: var(--text-secondary);
  margin-left: 3px;
  font-weight: 500;
}

/* ---- Controls ---- */
.controls{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  width: 100%;
}

.ctrl-btn{
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg-strong);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform .18s var(--ease-spring), box-shadow .25s, background .25s, opacity .2s;
}
.ctrl-btn:disabled{ opacity: .35; cursor: not-allowed; }
.ctrl-btn:not(:disabled):hover{ transform: translateY(-2px); }
.ctrl-btn:not(:disabled):active{ transform: translateY(0) scale(.96); }

.ctrl-secondary{
  width: 66px; height: 66px;
  border-radius: 50%;
  font-size: 13px;
  flex-direction: column;
  gap: 4px;
}
.ctrl-secondary i{ font-size: 16px; }
.ctrl-secondary span{ font-size: 11px; }

.ctrl-primary{
  width: 86px; height: 86px;
  border-radius: 50%;
  font-size: 13px;
  flex-direction: column;
  gap: 4px;
  background: var(--accent-gradient);
  color: #0a0e1a;
  border: none;
  font-weight: 600;
  box-shadow: 0 10px 30px -8px rgba(124,111,255,.55);
}
.ctrl-primary i{ font-size: 20px; }
.ctrl-primary.is-pause{ background: linear-gradient(135deg, var(--warning), #ff8a5c); }
.ctrl-primary.is-resume{ background: var(--accent-gradient); }

.ctrl-primary.glow{ animation: glowPulse 2.4s ease-in-out infinite; }
@keyframes glowPulse{
  0%,100%{ box-shadow: 0 10px 30px -8px rgba(124,111,255,.55), 0 0 0 0 rgba(124,111,255,.35); }
  50%{ box-shadow: 0 10px 34px -6px rgba(124,111,255,.75), 0 0 0 14px rgba(124,111,255,0); }
}

.ctrl-danger:hover{ color: var(--danger); border-color: var(--danger); }

.ctrl-stop{
  margin-top: -6px;
  padding: 10px 22px;
  font-size: 13px;
  color: var(--danger);
  background: rgba(255,92,114,0.1);
  border-color: rgba(255,92,114,0.25);
}
.ctrl-stop:hover{ background: rgba(255,92,114,0.18); }

/* Ripple effect element injected by JS */
.ripple{
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.5);
  transform: scale(0);
  animation: rippleAnim .6s ease-out forwards;
  pointer-events: none;
}
:root[data-theme="light"] .ripple{ background: rgba(20,25,45,.25); }
@keyframes rippleAnim{
  to{ transform: scale(2.6); opacity: 0; }
}

/* ==========================================================================
   Laps card
   ========================================================================== */
.laps-card{
  padding: 22px 22px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  min-height: 240px;
}

.laps-header{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.laps-header h2{
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.lap-count{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  padding: 2px 8px;
  border-radius: 999px;
}

.laps-actions{ display: flex; gap: 8px; }

.chip-btn{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-strong);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: color .2s, border-color .2s, transform .15s var(--ease-spring);
}
.chip-btn:hover{ color: var(--text-primary); border-color: var(--accent-1); transform: translateY(-1px); }
.chip-btn:active{ transform: translateY(0) scale(.95); }
.chip-btn.chip-danger:hover{ color: var(--danger); border-color: var(--danger); }

.laps-scroll{
  flex: 1;
  overflow-y: auto;
  min-height: 120px;
  max-height: 320px;
  padding-right: 4px;
}
.laps-scroll::-webkit-scrollbar{ width: 6px; }
.laps-scroll::-webkit-scrollbar-thumb{ background: var(--glass-border); border-radius: 6px; }

.laps-list{
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lap-row{
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg-strong);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  animation: lapEnter .4s var(--ease-out) both;
}
@keyframes lapEnter{
  from{ opacity: 0; transform: translateY(-8px) scale(.98); }
  to{ opacity: 1; transform: translateY(0) scale(1); }
}

.lap-num{
  font-weight: 600;
  color: var(--text-tertiary);
}
.lap-time{ color: var(--text-primary); letter-spacing: .3px; }
.lap-diff{
  color: var(--text-secondary);
  font-size: 12px;
  text-align: right;
  white-space: nowrap;
}

.lap-row.fastest{
  border-color: rgba(53,224,160,.4);
  background: rgba(53,224,160,.08);
}
.lap-row.fastest .lap-diff{ color: var(--success); }
.lap-row.slowest{
  border-color: rgba(255,92,114,.4);
  background: rgba(255,92,114,.08);
}
.lap-row.slowest .lap-diff{ color: var(--danger); }

/* ---- Empty state ---- */
.empty-state{
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  padding: 30px 10px 20px;
  color: var(--text-tertiary);
}
.empty-illustration{
  width: 56px; height: 56px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--glass-bg-strong);
  border: 1px dashed var(--glass-border);
  font-size: 20px;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}
.empty-title{ margin: 0; font-weight: 500; color: var(--text-secondary); }
.empty-sub{ margin: 0; font-size: 12.5px; }

/* ==========================================================================
   Footer shortcuts
   ========================================================================== */
.shortcuts-bar{
  display: flex;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-tertiary);
}
kbd{
  font-family: var(--font-mono);
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  padding: 2px 6px;
  margin-right: 5px;
  font-size: 11px;
  color: var(--text-secondary);
}

/* ==========================================================================
   Responsive tweaks
   ========================================================================== */
@media (max-width: 420px){
  .ctrl-primary{ width: 76px; height: 76px; }
  .ctrl-secondary{ width: 58px; height: 58px; }
  .laps-actions span{ display: none; }
}

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}