:root {
  --bg: #f5f7fb;
  --panel: rgba(255,255,255,0.88);
  --panel-strong: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-soft: rgba(37, 99, 235, 0.12);
  --success: #059669;
  --danger: #dc2626;
  --shadow: 0 10px 30px rgba(17, 24, 39, 0.08);
  --radius: 18px;
}

body.dark {
  --bg: #0b1120;
  --panel: rgba(17, 24, 39, 0.88);
  --panel-strong: #111827;
  --text: #f9fafb;
  --muted: #94a3b8;
  --line: #1f2937;
  --brand: #60a5fa;
  --brand-soft: rgba(96, 165, 250, 0.16);
  --success: #34d399;
  --danger: #f87171;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top right, rgba(37,99,235,0.12), transparent 25%),
    radial-gradient(circle at bottom left, rgba(16,185,129,0.1), transparent 25%),
    var(--bg);
  color: var(--text);
}

button, input, select, textarea {
  font: inherit;
}

.hidden { display: none !important; }

.auth-shell,
.app-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px 14px 36px;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  align-items: center;
}

.auth-card,
.card {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.auth-card {
  max-width: 470px;
  margin: 0 auto;
  width: 100%;
  padding: 22px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.topbar-actions {
  display: flex;
  gap: 10px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--brand);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(1.8rem, 5vw, 2.6rem); }
h2 { margin-bottom: 8px; }

.auth-tabs,
.tabs {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.auth-tabs { grid-template-columns: repeat(2, 1fr); }
.tabs { grid-template-columns: repeat(4, 1fr); }

.auth-tab,
.tab, .ghost-btn, .primary-btn, .file-btn, .icon-btn {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
}

.auth-tab,
.tab {
  padding: 12px 10px;
  font-weight: 650;
  backdrop-filter: blur(10px);
  cursor: pointer;
}

.auth-tab.active,
.tab.active {
  background: var(--brand);
  color: white;
  border-color: transparent;
}

.auth-form {
  display: grid;
  gap: 12px;
}

.auth-message {
  min-height: 1.5em;
  margin: 12px 0 0;
}

.full-width { width: 100%; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.intro-card { margin-bottom: 16px; }
.grid-two {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.stacked-mobile { align-items: flex-start; }
.muted { color: var(--muted); }
.tiny { font-size: 0.82rem; }

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--brand-soft);
  border-radius: 999px;
}

.chart {
  min-height: 220px;
}

.chart svg {
  width: 100%;
  height: 220px;
  display: block;
}

.select-wrap, label {
  display: grid;
  gap: 6px;
  font-size: 0.92rem;
}

input, select, textarea {
  width: 100%;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
}

.inline-controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  width: 100%;
}

.compact { width: auto; }

.exercise-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 14px;
  background: rgba(255,255,255,0.04);
}

.exercise-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.exercise-name {
  margin-bottom: 4px;
}

.superset-label {
  margin-bottom: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand);
}

.set-table {
  display: grid;
  gap: 8px;
}

.set-row {
  display: grid;
  grid-template-columns: 44px 1fr 1fr auto;
  gap: 8px;
  align-items: center;
}

.set-row.seconds-mode {
  grid-template-columns: 44px 1fr auto;
}

.set-label {
  font-weight: 700;
  color: var(--muted);
  text-align: center;
}

.icon-btn {
  width: 42px;
  height: 42px;
  font-size: 1.35rem;
  background: var(--panel-strong);
}

.ghost-btn, .primary-btn, .file-btn {
  padding: 12px 14px;
  font-weight: 650;
  cursor: pointer;
}

.primary-btn {
  background: var(--brand);
  color: white;
  border-color: transparent;
}

.file-btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.file-btn input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.notes-wrap {
  margin-top: 10px;
}

.action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.plan-workout {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.plan-workout:first-child {
  border-top: none;
  padding-top: 0;
}

.plan-pair {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  margin-top: 10px;
}

.plan-pair ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

.history-list {
  display: grid;
  gap: 12px;
}

.history-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: rgba(255,255,255,0.04);
}

.history-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.exercise-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--brand-soft);
  font-size: 0.86rem;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 120px;
  border: 1px dashed var(--line);
  border-radius: 16px;
  color: var(--muted);
  text-align: center;
  padding: 20px;
}

.pr-table {
  display: grid;
  gap: 8px;
}

.pr-row {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.9fr;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  align-items: center;
}

.pr-row.header {
  background: transparent;
  font-weight: 700;
}

.toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 20px;
  background: var(--text);
  color: var(--panel-strong);
  padding: 12px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  z-index: 1000;
}

@media (min-width: 760px) {
  .grid-two {
    grid-template-columns: 1fr 1fr;
  }

  .inline-controls {
    grid-template-columns: repeat(2, minmax(180px, 220px));
  }
}

@media (max-width: 640px) {
  .tabs {
    grid-template-columns: repeat(2, 1fr);
  }

  .topbar,
  .history-meta,
  .card-head {
    flex-direction: column;
  }

  .topbar-actions {
    width: 100%;
  }

  .topbar-actions .ghost-btn {
    flex: 1;
  }

  .set-row {
    grid-template-columns: 32px 1fr 1fr 36px;
  }

  .icon-btn {
    width: 36px;
    height: 36px;
  }

  .pr-row {
    grid-template-columns: 1fr;
  }

  .pr-row.header {
    display: none;
  }
}