:root {
  color-scheme: dark;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #0b1120;
  color: #e2e8f0;
  --bg: #0b1120;
  --surface: #111827;
  --surface-strong: #0f172a;
  --border: #1f2937;
  --border-strong: #334155;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.45);
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  background-color: var(--bg);
  color: #e2e8f0;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at top, #111d3a 0%, var(--bg) 55%);
}

.app-header {
  padding: 1.25rem 1.5rem;
  background: color-mix(in srgb, var(--surface-strong) 85%, transparent);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  z-index: 10;
}

.version {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  padding: 1.5rem 1.5rem 2.5rem;
  max-width: 1100px;
  width: min(100%, 1100px);
  align-self: center;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel h2 {
  margin-top: 0;
}

.session-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.session-sets,
.exercise-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  margin-bottom: 1rem;
  align-items: stretch;
}

.inline-form input {
  min-width: 0;
}

.exercise-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.exercise-title {
  font-weight: 600;
}

.exercise-actions {
  display: inline-flex;
  gap: 0.5rem;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: #e2e8f0;
  box-shadow: none;
  min-height: 36px;
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
}

.btn-icon.danger {
  border-color: rgba(248, 113, 113, 0.6);
  color: #f87171;
}

.card {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

form {
  display: grid;
  gap: 0.85rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: #cbd5f5;
}

input,
select,
button {
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  color: #e2e8f0;
  font-size: 1rem;
}

button {
  cursor: pointer;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b1120;
  font-weight: 600;
  min-height: 44px;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  box-shadow: 0 8px 18px rgba(14, 165, 233, 0.35);
}

button:active {
  transform: translateY(1px) scale(0.99);
}

button.ghost {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  margin-top: 1rem;
  box-shadow: none;
}

.empty {
  color: #64748b;
  font-size: 0.9rem;
}

@media (max-width: 520px) {
  .app-header {
    padding: 1rem 1.25rem;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 1.25rem 1.25rem 2rem;
  }

  .panel {
    padding: 1.25rem;
  }
}

@supports (padding: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }
}