:root {
  --paper: #f7faf2;
  --ink: #172624;
  --muted: #61736d;
  --panel: #ffffff;
  --line: #d4dfd7;
  --aqua: #149d98;
  --deep-aqua: #0d6f72;
  --mint: #94d7b7;
  --amber: #d7a843;
  --coral: #e46f5c;
  --violet: #65558f;
  --shadow: 0 24px 70px rgba(23, 38, 36, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(160deg, rgba(20, 157, 152, 0.16), transparent 42%),
    linear-gradient(340deg, rgba(215, 168, 67, 0.18), transparent 44%),
    linear-gradient(180deg, #fbfcf6 0%, #edf8f5 52%, #fff8ee 100%);
  display: grid;
  place-items: center;
  padding: 18px;
}

button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  letter-spacing: 0;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(20, 157, 152, 0.55);
  box-shadow: 0 12px 26px rgba(23, 38, 36, 0.1);
}

button:active {
  transform: translateY(0);
}

button:focus-visible {
  outline: 3px solid rgba(228, 111, 92, 0.32);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
  box-shadow: none;
}

svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.app {
  width: min(860px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, 0.62fr);
  gap: 14px;
}

.timer-panel,
.side-panel {
  border: 1px solid rgba(23, 38, 36, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.timer-panel {
  min-height: 550px;
  padding: clamp(18px, 3vw, 32px);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 24px;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--deep-aqua);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.35rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.icon-button {
  width: 48px;
  min-width: 48px;
  padding: 0;
  display: inline-grid;
  place-items: center;
}

#soundToggle[aria-pressed="false"] {
  color: var(--coral);
  background: #fff0ec;
}

.timer-face {
  --timer-progress: 0deg;
  width: min(360px, 76vw);
  aspect-ratio: 1;
  place-self: center;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.98) 0 58%, transparent 59%),
    conic-gradient(var(--aqua) var(--timer-progress), rgba(20, 157, 152, 0.14) 0),
    linear-gradient(145deg, rgba(148, 215, 183, 0.5), rgba(101, 85, 143, 0.2));
  box-shadow: inset 0 0 0 1px rgba(23, 38, 36, 0.1), 0 22px 60px rgba(20, 157, 152, 0.2);
}

.timer-core {
  width: 67%;
  display: grid;
  justify-items: center;
  gap: 10px;
  text-align: center;
}

.status,
.cadence {
  max-width: 100%;
  color: var(--muted);
  font-weight: 850;
  text-transform: uppercase;
}

.status {
  min-height: 1.1em;
  font-size: 0.78rem;
}

.cadence {
  font-size: clamp(0.88rem, 2.4vw, 1rem);
}

#timeDisplay {
  width: 100%;
  font-variant-numeric: tabular-nums;
  font-size: clamp(4rem, 13vw, 7rem);
  line-height: 0.9;
  letter-spacing: 0;
}

.controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(108px, 0.48fr);
  gap: 10px;
}

.controls button,
.sip-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 16px;
}

.primary {
  color: white;
  border-color: transparent;
  background: var(--deep-aqua);
}

.primary[data-running="true"] {
  background: var(--coral);
}

.primary .icon-pause,
.primary[data-running="true"] .icon-play {
  display: none;
}

.primary[data-running="true"] .icon-pause {
  display: block;
}

.side-panel {
  padding: clamp(16px, 2.5vw, 24px);
  display: grid;
  align-content: start;
  gap: 16px;
}

.bottle-wrap {
  min-height: 290px;
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 14px;
}

.bottle {
  width: 130px;
  height: 220px;
  display: grid;
  justify-items: center;
  grid-template-rows: 16px 30px 1fr;
}

.bottle-cap {
  width: 58px;
  height: 16px;
  border-radius: 7px 7px 3px 3px;
  background: var(--violet);
}

.bottle-neck {
  width: 46px;
  border: 2px solid rgba(23, 38, 36, 0.18);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  background: rgba(255, 255, 255, 0.5);
}

.bottle-body {
  --water-level: 0%;
  position: relative;
  width: 118px;
  overflow: hidden;
  border: 2px solid rgba(23, 38, 36, 0.18);
  border-radius: 8px 8px 24px 24px;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: inset 0 0 0 8px rgba(255, 255, 255, 0.3);
}

.water {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--water-level);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), transparent 18%),
    linear-gradient(180deg, #74d2ee 0%, var(--aqua) 100%);
  transition: height 280ms ease;
}

.bottle-body span {
  position: absolute;
  left: 18px;
  right: 18px;
  height: 1px;
  background: rgba(23, 38, 36, 0.14);
}

.bottle-body span:nth-child(2) {
  top: 25%;
}

.bottle-body span:nth-child(3) {
  top: 50%;
}

.bottle-body span:nth-child(4) {
  top: 75%;
}

.cup-count {
  text-align: center;
}

.cup-count span {
  display: block;
  font-size: clamp(2.2rem, 8vw, 3.4rem);
  line-height: 0.95;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.cup-count small {
  color: var(--muted);
  font-weight: 800;
}

.cup-controls {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  gap: 9px;
}

.sip-button {
  color: white;
  border-color: transparent;
  background: var(--aqua);
}

.sip-button.is-popping {
  animation: pop 260ms ease;
}

.presets {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.preset {
  padding: 0 10px;
}

.preset.active {
  color: white;
  border-color: transparent;
  background: var(--violet);
}

.app.is-done .timer-face {
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.98) 0 58%, transparent 59%),
    conic-gradient(var(--amber) 360deg, rgba(20, 157, 152, 0.14) 0),
    linear-gradient(145deg, rgba(215, 168, 67, 0.45), rgba(228, 111, 92, 0.18));
}

@keyframes pop {
  50% {
    transform: translateY(-2px) scale(1.035);
  }
}

@media (max-width: 760px) {
  body {
    align-items: start;
    padding: 12px;
  }

  .app {
    grid-template-columns: 1fr;
  }

  .timer-panel {
    min-height: auto;
  }

  .side-panel {
    grid-template-columns: minmax(132px, 0.7fr) minmax(0, 1fr);
    align-items: center;
  }

  .bottle-wrap {
    min-height: 230px;
  }

  .bottle {
    transform: scale(0.86);
  }

  .cup-controls,
  .presets {
    grid-column: 2;
  }
}

@media (max-width: 520px) {
  .app-header {
    align-items: center;
  }

  h1 {
    font-size: clamp(2rem, 11vw, 3.2rem);
  }

  .controls,
  .side-panel {
    grid-template-columns: 1fr;
  }

  .cup-controls,
  .presets {
    grid-column: auto;
  }

  .bottle-wrap {
    min-height: 214px;
  }

  .presets {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}