:root {
  --bg: #0f1419;
  --bg-card: #1a2332;
  --bg-sidebar: #0a0e14;
  --border: #2d3a4a;
  --text: #e6edf3;
  --text-muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 10px;
  --font: 'Manrope', -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.hidden { display: none !important; }

/* Login */
#login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(145deg, #0a0e14 0%, #151d2b 50%, #0f1419 100%);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.login-title {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
}

.login-subtitle {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.login-form label {
  display: block;
  margin-bottom: 1rem;
}

.login-form label span {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.login-form input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.login-form input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.login-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.error-msg {
  color: var(--danger);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  font: inherit;
  font-weight: 500;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  padding: 0.75rem;
}

.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary { background: var(--bg-card); color: var(--text-muted); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg); color: var(--text); }

.btn-danger { background: #8b2635; color: #fff; border: none; }
.btn-danger:hover { background: #a52d3f; }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover { color: var(--text); background: rgba(255,255,255,0.05); }

/* App layout */
#app-screen {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
}

.user-role {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav {
  flex: 1;
  padding: 0.75rem 0;
}

.nav-link {
  display: block;
  padding: 0.6rem 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.nav-link.active { color: var(--accent); background: rgba(59,130,246,0.1); }

.nav-admin,
.nav-client { display: none; }
.role-admin .nav-admin { display: block; }
.role-client .nav-client { display: block; }
.role-trainer .nav-client { display: none; }

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.main-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.main-header h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.user-info {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.page-content {
  flex: 1;
  padding: 1.5rem;
  overflow-auto;
}

.content-section {
  max-width: 900px;
}

.content-section.hidden { display: none; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.card .muted { color: var(--text-muted); font-size: 0.9rem; }

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
  margin-bottom: 1rem;
}

.form-row label { display: flex; align-items: center; gap: 0.5rem; }
.form-row input, .form-row select {
  padding: 0.5rem 0.75rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.02); }

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
}

.token-created {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: 6px;
}

.token-created code {
  display: block;
  margin-top: 0.5rem;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: 4px;
  font-size: 0.85rem;
  word-break: break-all;
}

.empty-msg { color: var(--text-muted); font-style: italic; }

/* Schedule: toolbar & view toggle */
.schedule-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.schedule-view-toggle .schedule-view-btn { margin-right: 0.25rem; }
.schedule-view-toggle .schedule-view-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.schedule-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; }
.schedule-controls label { display: flex; align-items: center; gap: 0.35rem; font-size: 0.9rem; }
.schedule-week-label { min-width: 140px; text-align: center; font-weight: 500; }

/* Schedule: week grid */
.schedule-week-wrap {
  overflow-x: auto;
  margin-top: 0.5rem;
}
.schedule-week-grid {
  display: grid;
  grid-template-columns: 52px repeat(7, minmax(100px, 1fr));
  grid-auto-rows: 28px;
  min-width: 700px;
  min-height: 400px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}
.schedule-week-grid .grid-corner { grid-column: 1; grid-row: 1; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.schedule-week-grid .grid-time {
  padding: 2px 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  align-self: stretch;
}
.schedule-week-grid .grid-day {
  padding: 6px 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}
.schedule-week-grid .grid-day:last-of-type { border-right: none; }
.schedule-week-grid .grid-cell {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  min-height: 28px;
  cursor: pointer;
  transition: background 0.15s;
}
.schedule-week-grid .grid-cell:hover { background: rgba(59, 130, 246, 0.12); }
.schedule-week-grid .grid-cell:last-of-type { border-right: none; }
.schedule-week-grid .schedule-slot-block {
  grid-column: span 1;
  margin: 2px 3px;
  padding: 4px 6px;
  border-radius: 6px;
  font-size: 0.8rem;
  line-height: 1.25;
  cursor: pointer;
  overflow: hidden;
  background: var(--accent);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  transition: opacity 0.15s;
}
.schedule-week-grid .schedule-slot-block:hover { opacity: 0.9; }
.schedule-week-grid .schedule-slot-block.slot-unavailable { background: var(--text-muted); }
.schedule-week-grid .schedule-slot-block .slot-service { font-weight: 600; }
.schedule-week-grid .schedule-slot-block .slot-trainer { font-size: 0.7rem; opacity: 0.9; }
.slot-form .form-row { margin-bottom: 0.75rem; }
.slot-form .form-row:last-of-type { margin-bottom: 0; }

/* Widget embed code */
.widget-embed-code {
  margin: 0;
  padding: 0.85rem 1rem;
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, monospace;
  font-size: 0.875rem;
  line-height: 1.4;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  overflow-x: auto;
  user-select: all;
}