:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --panel: #ffffff;
  --card: #ececef;
  --text: #1f2024;
  --muted: #5f6470;
  --shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fdfdfe, var(--bg) 25%);
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.2rem 4rem;
}

.hero {
  background: var(--panel);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.plan-status {
  margin: 0 0 1.1rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.45;
}

.warmup-panel {
  margin-top: 0.25rem;
  padding: 1rem 1.1rem;
  border-radius: 0.65rem;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
}

.warmup-heading {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 800;
}

.warmup-list {
  margin: 0;
  padding-left: 1.15rem;
  color: #404551;
  line-height: 1.5;
}

.warmup-list li {
  margin-bottom: 0.25rem;
}

.week {
  margin-top: 2.4rem;
}

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.3rem, 2.1vw, 1.9rem);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  min-height: 190px;
  background: var(--card);
  border-radius: 0.5rem;
  padding: 1rem 1.1rem;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.03);
  transition:
    box-shadow 0.2s ease,
    transform 0.2s ease,
    background 0.2s ease;
}

.card.is-current-day {
  background: #e0ecff;
  box-shadow:
    inset 0 0 0 2px #2563eb,
    0 8px 22px rgba(37, 99, 235, 0.18);
  transform: translateY(-2px);
}

h3 {
  margin: 0 0 0.55rem;
  font-size: 1.65rem;
  font-weight: 800;
}

.card p {
  margin: 0 0 0.55rem;
  line-height: 1.45;
  color: #404551;
}

.card ul {
  margin: 0;
  padding-left: 1.15rem;
}

.card li {
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.card-workout-btn {
  width: 100%;
  margin-top: 0.55rem;
  text-align: center;
}

.highlight {
  font-weight: 700;
  color: #111827;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  border-radius: 10px;
  padding: 0.65rem 0.95rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  line-height: 1.2;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
}

.btn-primary:hover:not(:disabled) {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.btn-secondary {
  background: #ffffff;
  color: #1e293b;
  border-color: #cbd5e1;
}

.btn-secondary:hover:not(:disabled) {
  background: #f8fafc;
  border-color: #94a3b8;
}

@media (max-width: 640px) {
  .page {
    padding: 1rem 0.9rem 2rem;
  }

  .hero {
    padding: 1.3rem 1rem;
  }

  .card {
    min-height: auto;
  }
}