:root {
  --bg-0: #f3f7fb;
  --bg-1: #eef4ff;
  --ink: #0b1a22;
  --muted: rgba(11, 26, 34, 0.66);
  --muted-2: rgba(11, 26, 34, 0.48);
  --card: rgba(255, 255, 255, 0.7);
  --card-border: rgba(13, 25, 34, 0.12);

  --cool-1: #88c7d6; /* inhale */
  --cool-2: #a7c6f3; /* hold */
  --cool-3: #7fbfc2; /* exhale */
  --accent: var(--cool-1);

  --shadow: 0 22px 60px rgba(12, 28, 40, 0.16);
  --shadow-soft: 0 10px 30px rgba(12, 28, 40, 0.12);

  --radius-lg: 22px;
  --radius-md: 16px;

  --ring-track: rgba(10, 20, 28, 0.10);
  --ring-width: 9;

  --ease: cubic-bezier(0.2, 0.9, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Manrope, ui-sans-serif, system-ui, -apple-system, Segoe UI, Arial,
    sans-serif;
  background:
    radial-gradient(1100px 700px at 12% 12%, rgba(136, 199, 214, 0.34), transparent 55%),
    radial-gradient(800px 520px at 92% 22%, rgba(167, 198, 243, 0.34), transparent 58%),
    radial-gradient(900px 620px at 60% 92%, rgba(127, 191, 194, 0.28), transparent 55%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  overflow-x: hidden;
}

.page {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: clamp(18px, 4vw, 36px);
}

.shell {
  width: min(920px, 100%);
  display: grid;
  gap: clamp(16px, 3vw, 22px);
}

.header {
  text-align: center;
}

.kicker {
  margin: 0 0 8px 0;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-size: 12px;
}

.header h1 {
  margin: 0;
  font-family: Fraunces, ui-serif, Georgia, serif;
  font-weight: 650;
  letter-spacing: -0.02em;
  font-size: clamp(44px, 7vw, 72px);
  line-height: 1;
}

.sub {
  margin: 10px auto 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: clamp(14px, 2.3vw, 16px);
  line-height: 1.5;
}

.card {
  position: relative;
  padding: clamp(18px, 3.4vw, 26px);
  border-radius: var(--radius-lg);
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  overflow: hidden;
}

.card::before,
.card::after {
  content: "";
  position: absolute;
  inset: -80px;
  background:
    radial-gradient(closest-side, rgba(136, 199, 214, 0.18), transparent 70%),
    radial-gradient(closest-side, rgba(167, 198, 243, 0.16), transparent 72%);
  filter: blur(18px);
  pointer-events: none;
  transform: translate3d(0, 0, 0);
}

.card::after {
  inset: -120px;
  background: radial-gradient(
    closest-side,
    rgba(127, 191, 194, 0.14),
    transparent 75%
  );
  filter: blur(28px);
}

.timer {
  position: relative;
  display: grid;
  place-items: center;
  margin: 4px auto 18px;
}

.ring {
  width: min(320px, 72vw);
  height: auto;
}

.ring__track {
  fill: none;
  stroke: var(--ring-track);
  stroke-width: var(--ring-width);
}

.ring__progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: var(--ring-width);
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
  filter: url(#softGlow);
  transition: stroke 260ms var(--ease);
}

.timer__center {
  position: absolute;
  display: grid;
  place-items: center;
  text-align: center;
  gap: 6px;
  width: min(260px, 78vw);
}

.phase {
  font-weight: 650;
  color: var(--muted);
  letter-spacing: 0.02em;
  font-size: 13px;
  text-transform: uppercase;
}

.seconds {
  font-family: Fraunces, ui-serif, Georgia, serif;
  font-weight: 650;
  font-size: clamp(54px, 10vw, 78px);
  line-height: 1;
  letter-spacing: -0.02em;
}

.hint {
  color: var(--muted-2);
  font-size: 13px;
  line-height: 1.4;
}

.tips {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid rgba(10, 20, 28, 0.10);
  background: rgba(255, 255, 255, 0.55);
  padding: 14px 14px;
  box-shadow: var(--shadow-soft);
}

.tips__label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 650;
}

.tips__text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(11, 26, 34, 0.80);
  min-height: 2.6em;
}

.tips__text.is-changing {
  animation: tipSwap 420ms var(--ease);
}

@keyframes tipSwap {
  0% {
    opacity: 0;
    transform: translateY(4px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 14px auto 18px;
}

.pill {
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(10, 20, 28, 0.10);
}

.pill__label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pill__value {
  font-family: Fraunces, ui-serif, Georgia, serif;
  font-weight: 650;
  font-size: 18px;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0 auto;
  width: min(520px, 100%);
}

.btn {
  position: relative;
  border: 0;
  border-radius: 16px;
  padding: 12px 14px;
  font-family: Manrope, ui-sans-serif, system-ui, -apple-system, Segoe UI, Arial,
    sans-serif;
  font-weight: 650;
  letter-spacing: 0.01em;
  cursor: pointer;
  transform: translateZ(0);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease),
    background 200ms var(--ease), border-color 200ms var(--ease);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:focus-visible {
  outline: 3px solid rgba(167, 198, 243, 0.75);
  outline-offset: 3px;
}

.btn--primary {
  color: rgba(6, 12, 18, 0.96);
  background:
    linear-gradient(135deg, rgba(136, 199, 214, 0.92), rgba(167, 198, 243, 0.88));
  box-shadow: 0 16px 32px rgba(12, 28, 40, 0.18);
  overflow: hidden;
}

.btn--primary .btn__shine {
  position: absolute;
  inset: -40% -40% auto auto;
  width: 180px;
  height: 180px;
  background: radial-gradient(
    closest-side,
    rgba(255, 255, 255, 0.6),
    transparent 70%
  );
  transform: translate3d(10px, -10px, 0);
  opacity: 0.65;
  pointer-events: none;
}

.btn--ghost {
  color: rgba(11, 26, 34, 0.86);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(10, 20, 28, 0.14);
  box-shadow: var(--shadow-soft);
}

.btn:hover {
  transform: translateY(-1px) scale(1.02);
}

.btn:active {
  transform: translateY(0) scale(0.985);
}

.btn.is-running {
  background:
    linear-gradient(135deg, rgba(127, 191, 194, 0.92), rgba(136, 199, 214, 0.88));
}

.ripple {
  position: absolute;
  border-radius: 999px;
  transform: scale(0);
  animation: ripple 560ms var(--ease);
  background: rgba(255, 255, 255, 0.55);
  pointer-events: none;
  mix-blend-mode: soft-light;
}

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 0.9;
  }
  100% {
    transform: scale(1);
    opacity: 0;
  }
}

.footer {
  margin-top: 14px;
  text-align: center;
}

.footer__note {
  margin: 0;
  font-size: 12px;
  color: var(--muted-2);
}

@media (max-width: 520px) {
  .controls {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn,
  .ring__progress,
  .tips__text.is-changing {
    transition: none !important;
    animation: none !important;
  }
}