:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --fg: #202124;
  --muted: #5f6368;
  --border: #dadce0;
  --border-light: #e8eaed;
  --accent: #1a73e8;
  --accent-dark: #1558b0;
  --accent-bg: #e8f0fe;
  --danger: #d93025;
  --danger-bg: #fce8e6;
  --success: #188038;
  --processing: #f9ab00;
  --processing-bg: #fef7e0;
  --processing-fg: #7a5b00;
  --rotation: #9334e6;
  --rotation-bg: #f3e8fd;
  --shadow-1: 0 1px 2px 0 rgba(60,64,67,.3), 0 1px 3px 1px rgba(60,64,67,.15);
  --shadow-2: 0 1px 3px 0 rgba(60,64,67,.3), 0 4px 8px 3px rgba(60,64,67,.15);
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  font-family: "Google Sans", Roboto, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  margin: 0;
  padding: 0 1.5rem 3rem;
  max-width: 900px;
  margin-inline: auto;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Top progress bar ---------- */
.top-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.25s ease, opacity 0.3s ease 0.15s;
  opacity: 0;
}

.top-progress.active {
  opacity: 1;
  background: linear-gradient(90deg, #4285f4, #1a73e8, #1558b0, #1a73e8, #4285f4);
  background-size: 200% 100%;
  animation: progress-shimmer 1.1s linear infinite;
}

@keyframes progress-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 0 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0 0 0.9rem;
}

h3 {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--muted);
  margin: 1.5rem 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.google-status {
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.google-status a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.google-status a:hover { text-decoration: underline; }

.reconnect-link {
  color: var(--muted) !important;
  font-weight: 400 !important;
  font-size: 0.8rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
}

/* ---------- Session bar ---------- */
.session-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.session-bar label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}

.session-bar select {
  flex: 1;
  min-width: 160px;
}

/* ---------- Buttons ---------- */
button {
  cursor: pointer;
  padding: 0.5rem 1.1rem;
  border: 1px solid transparent;
  background: var(--accent);
  color: white;
  border-radius: 20px;
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  transition: background 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
  box-shadow: var(--shadow-1);
}

button:disabled {
  opacity: 0.65;
  cursor: default;
}

button.secondary {
  background: var(--surface);
  color: var(--accent);
  border-color: var(--border);
}

button.secondary:hover:not(:disabled) {
  background: var(--accent-bg);
}

button.cancel-btn {
  background: transparent;
  color: var(--muted);
  border-color: transparent;
}

button.cancel-btn:hover:not(:disabled) {
  background: var(--border-light);
}

button.danger {
  background: var(--surface);
  color: var(--danger);
  border-color: var(--border);
}

button.danger:hover:not(:disabled) {
  background: var(--danger-bg);
}

/* inline button spinner */
.btn-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

button.secondary .btn-spinner,
button.cancel-btn .btn-spinner,
button.danger .btn-spinner {
  border: 2px solid rgba(26, 115, 232, 0.25);
  border-top-color: var(--accent);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-light);
}

.tab-btn {
  background: transparent;
  color: var(--muted);
  border: none;
  border-radius: 0;
  padding: 0.7rem 0.1rem;
  border-bottom: 3px solid transparent;
  font-weight: 500;
}

.tab-btn:hover:not(:disabled) {
  background: transparent;
  color: var(--accent);
  box-shadow: none;
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fade-in 0.2s ease; }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Cards / forms ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.9rem;
  margin-bottom: 0.9rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}

input, select {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--fg);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.days-fieldset {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  border: none;
  padding: 0;
  margin: 0 0 1rem;
}

.days-fieldset legend {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 0.4rem;
  padding: 0;
}

.days-fieldset label {
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
  color: var(--fg);
  font-weight: 400;
  background: var(--bg);
  border: 1px solid var(--border-light);
  padding: 0.35rem 0.7rem;
  border-radius: 16px;
  cursor: pointer;
}

.days-fieldset input[type="checkbox"] {
  accent-color: var(--accent);
}

/* ---------- Table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.data-table th {
  text-align: left;
  padding: 0.7rem 0.9rem;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--bg);
  border-bottom: 1px solid var(--border-light);
}

.data-table td {
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--border-light);
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--bg); }
.data-table tbody tr.row-loading { opacity: 0.5; pointer-events: none; }

/* Optimistic "processing" row shown immediately on add, before the server confirms. */
.data-table tbody tr.row-processing {
  background: var(--processing-bg);
}

.data-table tbody tr.row-processing:hover { background: var(--processing-bg); }

.processing-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--processing);
  font-weight: 500;
  font-size: 0.8rem;
}

.processing-badge .btn-spinner {
  border-color: rgba(249, 171, 0, 0.3);
  border-top-color: var(--processing);
}

.row-processing td {
  color: var(--processing-fg);
}

/* ---------- Pills ---------- */
.pill-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
}

.pill-list li {
  background: var(--surface);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-1);
  border-radius: 999px;
  padding: 0.4rem 0.5rem 0.4rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  transition: opacity 0.15s ease;
}

.pill-list li.pill-loading { opacity: 0.5; }

.pill-list button {
  padding: 0.2rem 0.65rem;
  font-size: 0.75rem;
}

/* ---------- Dialog ---------- */
dialog {
  border: none;
  border-radius: 14px;
  background: var(--surface);
  color: var(--fg);
  padding: 1.5rem;
  width: min(420px, 90vw);
  box-shadow: var(--shadow-2);
}

dialog::backdrop {
  background: rgba(32, 33, 36, 0.5);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ---------- Day rows ---------- */
.day-event-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  transition: opacity 0.15s ease;
}

.day-event-row:last-child { border-bottom: none; }
.day-event-row.row-loading { opacity: 0.5; pointer-events: none; }

.day-event-row .title {
  font-weight: 500;
  min-width: 200px;
}

.day-event-row label {
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
  font-weight: 400;
}

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

/* Hidden when the current session's calendar type is "rotation". */
body.rotation-mode .classes-only { display: none; }

.calendar-type-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent-dark);
  margin-left: 0.5rem;
}

body.rotation-mode .calendar-type-tag {
  background: var(--rotation-bg);
  color: var(--rotation);
}

.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #323232;
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1000;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error { background: var(--danger); }