:root {
  color-scheme: dark;
  --bg: #0c1116;
  --panel: #151c22;
  --panel-strong: #1c252d;
  --text: #f5f7fa;
  --muted: #9ca9b5;
  --border: rgba(255, 255, 255, 0.08);
  --accent: #57d38c;
  --warning: #ffb347;
  --rest: #f58a4b;
  --long-rest: #4e88ff;
  --danger: #e76c6c;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --font-display: "Arial Black", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(87, 211, 140, 0.12), transparent 32%),
    linear-gradient(180deg, #0b1015 0%, #121922 100%);
  color: var(--text);
  font-family: "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.screen {
  display: none;
  min-height: 100vh;
  padding: 20px 16px calc(24px + env(safe-area-inset-bottom));
}

.screen.active {
  display: block;
}

.hero-card,
.panel,
.block-card,
.modal-card,
.stat-card {
  background: rgba(21, 28, 34, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card,
.panel,
.modal-card {
  padding: 20px;
}

.hero-card h1,
.panel h2,
.panel h3,
.modal-card h2 {
  margin: 0;
}

.eyebrow {
  margin: 0 0 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
}

.hero-copy,
.training-context,
.training-exercise-name,
.field span,
.stat-card span,
.routine-meta,
.history-meta {
  color: var(--muted);
}

.hero-actions,
.form-actions,
.training-controls,
.topbar-actions,
.section-head,
.grid-two {
  display: flex;
  gap: 12px;
}

.hero-actions,
.training-controls,
.form-actions {
  margin-top: 20px;
}

.content-stack,
.form-stack,
.routine-list,
.blocks-container,
.history-list {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.section-head {
  align-items: center;
  justify-content: space-between;
}

.grid-two {
  flex-wrap: wrap;
}

.grid-two .field {
  flex: 1 1 180px;
}

.field {
  display: grid;
  gap: 8px;
}

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  padding: 14px 16px;
}

.field textarea {
  resize: vertical;
}

.btn {
  min-height: 52px;
  border-radius: 18px;
  padding: 0 18px;
  font-weight: 700;
  transition: transform 180ms ease, filter 180ms ease, background 180ms ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #07110a;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.badge {
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(87, 211, 140, 0.16);
  color: var(--accent);
  font-weight: 700;
}

.routine-card {
  padding: 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(29, 38, 47, 0.95), rgba(19, 25, 32, 0.95));
  border: 1px solid var(--border);
  display: grid;
  gap: 14px;
}

.routine-header,
.routine-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.routine-actions {
  flex-wrap: wrap;
}

@media (max-width: 520px) {
  .routine-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .routine-actions .btn {
    min-height: 46px;
    padding: 0 8px;
    font-size: 0.9rem;
  }
}

.routine-title {
  margin: 0;
  font-size: 1.15rem;
}

.routine-meta,
.history-meta {
  margin: 4px 0 0;
  line-height: 1.45;
}

.empty-state {
  padding: 28px 20px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 22px;
  color: var(--muted);
}

.sticky-top {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(14px);
}

.block-card {
  padding: 18px;
}

.modal {
  width: min(92vw, 720px);
  border: 0;
  background: transparent;
  padding: 0;
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.6);
}

.history-entry {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.history-entry:last-child {
  border-bottom: 0;
}

.training-screen {
  transition: background 280ms ease;
  display: none;
}

.training-screen.active {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 18px;
}

.training-screen.phase-exercise {
  background:
    radial-gradient(circle at top, rgba(87, 211, 140, 0.18), transparent 35%),
    #08110c;
}

.training-screen.phase-rest {
  background:
    radial-gradient(circle at top, rgba(245, 138, 75, 0.22), transparent 35%),
    #1a1009;
}

.training-screen.phase-block-rest {
  background:
    radial-gradient(circle at top, rgba(78, 136, 255, 0.22), transparent 35%),
    #0a1220;
}

.training-topbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.training-stage {
  display: grid;
  place-items: center;
  text-align: center;
  align-content: center;
  gap: 14px;
}

.training-phase {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.22em;
}

.training-context,
.training-exercise-name {
  margin: 0;
}

.training-exercise-name {
  font-size: clamp(1.2rem, 5vw, 2rem);
}

.training-timer {
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 24vw, 8rem);
  line-height: 0.92;
  letter-spacing: 0.04em;
}

.session-stats {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  padding: 16px;
  text-align: left;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.35rem;
}

.training-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (min-width: 700px) {
  .screen {
    padding-inline: max(24px, calc((100vw - 640px) / 2));
  }
}