:root {
  color-scheme: light;
  --ink: #151515;
  --muted: #5b5f66;
  --surface: #fffdf8;
  --panel: rgba(255, 255, 255, 0.72);
  --line: rgba(21, 21, 21, 0.14);
  --accent: #d7263d;
  --status: #64748b;
  --status-deep: #1f2937;
  --status-soft: #eef2f7;
  --shadow: rgba(28, 22, 20, 0.2);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

body[data-status="slow"] {
  --status: #1976d2;
  --status-deep: #0f3f75;
  --status-soft: #dff0ff;
  --accent: #1976d2;
}

body[data-status="target"] {
  --status: #00875a;
  --status-deep: #00583d;
  --status-soft: #dcf7ec;
  --accent: #00a86b;
}

body[data-status="fast"] {
  --status: #d7263d;
  --status-deep: #831926;
  --status-soft: #ffe3e7;
  --accent: #d7263d;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(215, 38, 61, 0.18);
  background:
    radial-gradient(circle at 50% 18%, var(--status-soft), transparent 34rem),
    linear-gradient(135deg, #fff8e8 0%, #f2f7ff 48%, #fdf2f5 100%);
  transition: background 240ms ease;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-160%);
  border-radius: 0.375rem;
  background: var(--ink);
  color: white;
  padding: 0.75rem 1rem;
  text-decoration: none;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.trainer-shell {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: max(clamp(0.75rem, 2vw, 1.25rem), env(safe-area-inset-top))
    max(clamp(0.75rem, 2vw, 1.25rem), env(safe-area-inset-right))
    max(clamp(0.75rem, 2vw, 1.25rem), env(safe-area-inset-bottom))
    max(clamp(0.75rem, 2vw, 1.25rem), env(safe-area-inset-left));
}

.trainer-stage {
  width: min(100%, 74rem);
  display: grid;
  grid-template-rows: auto auto 1fr auto auto auto;
  align-items: center;
  justify-items: center;
  gap: clamp(0.55rem, 1.45vh, 1rem);
  padding: clamp(0.75rem, 2.5vw, 1.75rem);
}

.title-block {
  text-align: center;
}

.subject-label,
.subtitle,
.metric-label,
.safety-note {
  color: var(--muted);
}

.subject-label {
  margin: 0 0 0.3rem;
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  font-weight: 800;
}

h1 {
  margin: 0;
  font-size: clamp(2.7rem, 8vw, 5.8rem);
  line-height: 0.92;
  letter-spacing: 0;
  text-wrap: balance;
}

.subtitle {
  margin: 0.45rem 0 0;
  font-size: clamp(1.05rem, 2.5vw, 1.7rem);
  font-weight: 800;
}

.status-strip {
  width: min(100%, 43rem);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--line);
  box-shadow: 0 1.2rem 3rem rgba(20, 20, 20, 0.08);
}

.status-strip > div {
  min-width: 0;
  display: grid;
  gap: 0.25rem;
  justify-items: center;
  background: var(--panel);
  padding: clamp(0.65rem, 1.6vw, 0.9rem);
  backdrop-filter: blur(14px);
}

.metric-label {
  font-size: 0.78rem;
  font-weight: 800;
}

.status-strip strong {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  color: var(--status-deep);
  font-size: clamp(1.45rem, 5vw, 2.4rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.status-strip small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.heart-button {
  position: relative;
  width: min(58vw, 17rem);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(215, 38, 61, 0.22);
  transform: translateZ(0);
}

.heart-button:focus-visible,
.reset-button:focus-visible {
  outline: 0.3rem solid var(--status-deep);
  outline-offset: 0.35rem;
}

.heart-button::before,
.heart-button::after {
  content: "";
  position: absolute;
  inset: 8%;
  border-radius: 999px;
  background: var(--status);
  opacity: 0.14;
  transform: scale(0.86);
  transition:
    background 220ms ease,
    opacity 220ms ease,
    transform 220ms ease;
}

.heart-button::after {
  inset: 2%;
  opacity: 0.06;
  transform: scale(1);
}

.heart-button.is-pressed::before {
  transform: scale(1);
  opacity: 0.22;
}

.heart-button:hover::before {
  transform: scale(0.94);
  opacity: 0.2;
}

.heart-shape {
  position: relative;
  width: 66%;
  aspect-ratio: 1;
  transform: rotate(-45deg);
  background: var(--accent);
  box-shadow:
    0 1.4rem 3rem var(--shadow),
    inset 0 -1.2rem 2rem rgba(80, 0, 12, 0.18),
    inset 0 1rem 1.5rem rgba(255, 255, 255, 0.25);
  transition:
    background 220ms ease,
    transform 120ms ease;
}

.heart-shape::before,
.heart-shape::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: inherit;
}

.heart-shape::before {
  top: -50%;
  left: 0;
}

.heart-shape::after {
  left: 50%;
  top: 0;
}

.heart-button.is-pressed .heart-shape {
  transform: rotate(-45deg) scale(0.9);
}

.heart-count {
  position: absolute;
  z-index: 1;
  color: white;
  font-size: clamp(3rem, 10vw, 6.8rem);
  font-weight: 950;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-shadow: 0 0.2rem 1rem rgba(60, 0, 16, 0.36);
  pointer-events: none;
}

.feedback {
  min-height: 1.2em;
  margin: 0;
  color: var(--status-deep);
  font-size: clamp(1.45rem, 4.4vw, 3rem);
  font-weight: 950;
  text-align: center;
  transition:
    color 220ms ease,
    transform 160ms ease;
}

.feedback.is-live {
  transform: translateY(-0.12rem) scale(1.03);
}

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

.reset-button {
  min-height: 2.55rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  padding: 0.7rem 1.05rem;
  font-weight: 850;
  cursor: pointer;
  box-shadow: 0 0.7rem 1.4rem rgba(20, 20, 20, 0.08);
}

.reset-button:hover {
  border-color: var(--status);
}

.safety-note {
  max-width: 42rem;
  margin: 0;
  text-align: center;
  font-size: clamp(0.86rem, 2vw, 1rem);
  line-height: 1.55;
}

@media (max-width: 43rem) {
  .trainer-stage {
    padding-inline: 0.25rem;
  }

  .status-strip {
    width: 100%;
  }

  .status-strip > div {
    padding-inline: 0.5rem;
  }

  .heart-button {
    width: min(74vw, 16rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}