:root[data-theme="dark"] {
  --bg: #121417;
  --bg-elevated: #1c1f24;
  --text: #e9edf1;
  --text-muted: #9aa4b0;
  --accent: #4f9dff;
  --accent-text: #051022;
  --border: #2c313a;
  --danger: #ff6b6b;
  --input-bg: #0e1013;
  --state-idle: #4b5563;
  --state-idle-text: #d5d9df;
  --state-active: #3ddc84;
  --state-active-text: #06210f;
  --state-done-text: #2a0605;
}

:root[data-theme="light"] {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --text: #1a1d21;
  --text-muted: #5c6672;
  --accent: #1f6fe0;
  --accent-text: #ffffff;
  --border: #dde1e6;
  --danger: #c62828;
  --input-bg: #ffffff;
  --state-idle: #b7bec7;
  --state-idle-text: #262b31;
  --state-active: #2e9e5b;
  --state-active-text: #ffffff;
  --state-done-text: #ffffff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100%;
}

/* ---------- Header / hamburger ---------- */

.app-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-title {
  font-size: 1.15rem;
  margin: 0;
  flex: 1;
  text-align: center;
}

.header-spacer { width: 40px; }

.hamburger {
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
}

.side-menu {
  position: fixed;
  top: 0;
  left: -280px;
  width: 260px;
  height: 100%;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  transition: left 0.2s ease;
  z-index: 30;
  padding: 16px;
}
.side-menu.open { left: 0; }

.close-menu {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  float: right;
}

.side-menu ul {
  list-style: none;
  padding: 0;
  margin: 48px 0 0;
}
.side-menu li { margin-bottom: 4px; }
.side-menu a, .side-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 8px;
  color: var(--text);
  text-decoration: none;
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 6px;
}
.side-menu a:hover, .side-menu button:hover { background: var(--border); }
.menu-divider { border-top: 1px solid var(--border); margin: 8px 0; }
.menu-email { color: var(--text-muted); font-size: 0.85rem; padding: 6px 8px; }

.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: none;
  z-index: 20;
}
.menu-overlay.visible { display: block; }

/* ---------- Auth pages ---------- */

.auth-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.auth-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  max-width: 380px;
  width: 100%;
}
.auth-card h1 { margin-top: 0; font-size: 1.4rem; }
.auth-sub { color: var(--text-muted); font-size: 0.9rem; }
.auth-card form { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.auth-card label { font-size: 0.85rem; color: var(--text-muted); }
.auth-card input {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
}
.auth-card button {
  margin-top: 8px;
  padding: 12px;
  border-radius: 6px;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1rem;
  cursor: pointer;
}
.error-msg { color: var(--danger); font-size: 0.9rem; }

/* ---------- Main tracker ---------- */

.app-main { padding: 16px; max-width: 900px; margin: 0 auto; }

.date-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.date-row input[type="date"] {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
}

.table-wrap { width: 100%; overflow-x: auto; }

.workout-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.workout-table th, .workout-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.workout-table th { color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; }
.ex-name { white-space: nowrap; }
.ex-code { color: var(--text-muted); font-size: 0.8rem; }

.code-toggle {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--state-idle);
  color: var(--state-idle-text);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
}
.code-toggle.state-active {
  background: var(--state-active);
  color: var(--state-active-text);
}
.code-toggle.state-done {
  background: var(--danger);
  color: var(--state-done-text);
}

.minutes-cell {
  text-align: right;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 4px;
}
.stepper input {
  width: 60px;
  padding: 8px 4px;
  text-align: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
}
.step-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
}
.step-btn:disabled,
.stepper input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.save-btn {
  margin-top: 18px;
  width: 100%;
  padding: 14px;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
.save-status {
  text-align: center;
  min-height: 1.2em;
  color: var(--text-muted);
}

/* ---------- Graph page ---------- */

.graph-page { display: flex; flex-direction: column; gap: 16px; }
.graph-controls { display: flex; align-items: center; gap: 10px; }
.graph-controls select {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  flex: 1;
}
.chart-wrap {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
}
#chartSvg { width: 100%; height: auto; display: block; }
.chart-empty { text-align: center; color: var(--text-muted); }

/* ---------- Responsive: landscape / portrait ---------- */

@media (orientation: landscape) and (max-height: 500px) {
  .app-main { max-width: 100%; padding: 10px 24px; }
  .workout-table th, .workout-table td { padding: 6px 8px; }
  .side-menu { width: 220px; }
}

@media (max-width: 480px) {
  .app-title { font-size: 1rem; }
  .stepper input { width: 48px; }
  .step-btn { width: 28px; height: 28px; }
  .code-toggle { width: 36px; height: 36px; font-size: 0.8rem; }
  .minutes-cell { font-size: 0.85rem; }
}