:root {
  color-scheme: dark;
  --bg-deep: #05040b;
  --bg-mid: #0d1122;
  --bg-bright: #1a2354;
  --neon-cyan: #2bfff3;
  --neon-pink: #ff4fd8;
  --neon-blue: #6a7dff;
  --neon-lime: #b9ff6e;
  --text: #f7f7ff;
  --muted: rgba(247, 247, 255, 0.6);
  --panel: rgba(8, 12, 24, 0.62);
  --ring-track: rgba(255, 255, 255, 0.14);
  --shadow: 0 28px 80px rgba(7, 5, 24, 0.55);
  --radius: 999px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Chakra Petch", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, rgba(106, 125, 255, 0.25), transparent 45%),
    radial-gradient(circle at 80% 30%, rgba(255, 79, 216, 0.18), transparent 40%),
    radial-gradient(circle at 60% 80%, rgba(43, 255, 243, 0.15), transparent 45%),
    linear-gradient(135deg, var(--bg-deep), var(--bg-mid) 45%, var(--bg-bright) 100%);
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(4px);
  opacity: 0.75;
  animation: drift 18s ease-in-out infinite;
}

.glow-a {
  width: 280px;
  height: 280px;
  top: 10%;
  left: 8%;
  background: radial-gradient(circle, rgba(255, 79, 216, 0.5), transparent 70%);
}

.glow-b {
  width: 220px;
  height: 220px;
  top: 65%;
  left: 70%;
  background: radial-gradient(circle, rgba(43, 255, 243, 0.45), transparent 70%);
  animation-delay: -6s;
}

.glow-c {
  width: 320px;
  height: 320px;
  top: 45%;
  left: 28%;
  background: radial-gradient(circle, rgba(106, 125, 255, 0.4), transparent 70%);
  animation-delay: -12s;
}

.scanlines {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.04),
      rgba(255, 255, 255, 0.04) 1px,
      transparent 1px,
      transparent 6px
    );
  mix-blend-mode: soft-light;
  opacity: 0.35;
}

.frame {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 24px 64px;
  display: grid;
  gap: 24px;
}

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

.back-link,
.mode-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  background: rgba(9, 12, 24, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 30px rgba(6, 5, 22, 0.4);
  color: var(--text);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.back-link:hover,
.mode-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 18px 40px rgba(12, 10, 30, 0.55);
}

.core {
  display: grid;
  justify-items: center;
  gap: 24px;
}

.mode-title {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
}

.ring {
  position: relative;
  width: min(72vw, 380px);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  isolation: isolate;
}

.ring::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--neon-cyan) 0deg,
    var(--neon-pink) var(--progress, 0deg),
    var(--ring-track) var(--progress, 0deg)
  );
  -webkit-mask: radial-gradient(circle, transparent 60%, #000 63%);
  mask: radial-gradient(circle, transparent 60%, #000 63%);
  filter: drop-shadow(0 0 14px rgba(43, 255, 243, 0.6));
  transition: filter 0.3s ease;
}

.ring::after {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background: radial-gradient(circle at top, rgba(255, 255, 255, 0.12), transparent 65%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 0 20px rgba(10, 18, 36, 0.8);
}

.ring-inner {
  width: 80%;
  height: 80%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  padding: clamp(10px, 3vw, 20px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  position: relative;
}

.display-grid {
  display: grid;
  grid-template-columns: 0 1fr 0;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 0;
  transition: grid-template-columns 0.35s ease;
}

.time-display {
  display: grid;
  justify-items: center;
  gap: 6px;
  text-shadow: 0 0 16px rgba(43, 255, 243, 0.35);
  justify-self: center;
}

.time-main {
  font-family: "Share Tech Mono", "Courier New", monospace;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: 0.12em;
}

.time-sub {
  font-family: "Share Tech Mono", "Courier New", monospace;
  font-size: 0.9rem;
  letter-spacing: 0.4em;
  color: var(--muted);
}

.adjust-spacer {
  width: 100%;
  height: 100%;
  visibility: hidden;
  pointer-events: none;
}

.adjust-col {
  display: grid;
  gap: 10px;
  justify-items: center;
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.adjust-btn {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(12, 16, 34, 0.75);
  color: var(--text);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 18px rgba(6, 6, 22, 0.5);
  transition: transform 0.2s ease, border 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.adjust-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 12px 24px rgba(12, 10, 30, 0.6);
}

.adjust-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: 0 8px 18px rgba(6, 6, 22, 0.35);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 18px;
}

.icon-btn {
  width: 64px;
  height: 64px;
  border-radius: 22px;
  border: none;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.icon-btn:focus-visible,
.adjust-btn:focus-visible,
.back-link:focus-visible,
.mode-btn:focus-visible {
  outline: 2px solid var(--neon-lime);
  outline-offset: 3px;
}

.icon-btn.primary {
  background: linear-gradient(135deg, rgba(43, 255, 243, 0.35), rgba(255, 79, 216, 0.45));
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 18px 40px rgba(18, 16, 46, 0.6);
}

.icon-btn.ghost {
  background: rgba(9, 12, 24, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 14px 30px rgba(8, 6, 24, 0.6);
}

.icon-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.35);
}

.icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-play,
.icon-pause {
  fill: currentColor;
  stroke: none;
}

.icon-pause {
  display: none;
}

#start-btn[data-state="pause"] .icon-play {
  display: none;
}

#start-btn[data-state="pause"] .icon-pause {
  display: block;
}

body[data-mode="stopwatch"] .mode-btn .icon-hourglass {
  display: block;
}

body[data-mode="stopwatch"] .mode-btn .icon-stopwatch {
  display: none;
}

body[data-mode="timer"] .mode-btn .icon-hourglass {
  display: none;
}

body[data-mode="timer"] .mode-btn .icon-stopwatch {
  display: block;
}

body[data-mode="timer"] .display-grid {
  grid-template-columns: minmax(56px, 1fr) minmax(0, 1fr) minmax(56px, 1fr);
}

body[data-mode="timer"] .adjust-col {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
  visibility: visible;
}

body[data-mode="timer"] .adjust-btn {
  animation: floaty 4.6s ease-in-out infinite;
}

body[data-mode="timer"] .adjust-col .adjust-btn:nth-child(2) {
  animation-delay: -1.8s;
}

body.is-running .ring::before {
  filter: drop-shadow(0 0 24px rgba(255, 79, 216, 0.6));
  animation: pulse 1.8s ease-in-out infinite;
}

body.is-finished .ring::before {
  filter: drop-shadow(0 0 26px rgba(255, 84, 88, 0.8));
  animation: alarm 1.2s ease-in-out infinite;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(12px, -18px, 0);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.9;
  }
  50% {
    opacity: 1;
  }
}

@keyframes alarm {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

@media (max-width: 720px) {
  .frame {
    padding: 32px 18px 56px;
  }

  .controls {
    gap: 14px;
  }

  .icon-btn {
    width: 56px;
    height: 56px;
  }

  .ring {
    width: min(84vw, 320px);
  }
}

@media (max-width: 480px) {
  .mode-title {
    text-align: center;
  }

  .time-main {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .display-grid {
    padding: 0 6px;
  }
}