:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --ink: #1d2433;
  --muted: #6b7386;
  --line: #e3e7ef;
  --accent: #4f7cff;
  --accent-dark: #3b63d8;
  --green: #21a36a;
  --red: #d5484f;
  --amber: #d9930d;
  --sidebar: #1c2333;
  --sidebar-ink: #c6cde0;
  --radius: 10px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--ink); font-size: 14px; }
.hidden { display: none !important; }

/* Auth */
.auth-screen { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #1c2333, #2b3653); }
.auth-card { background: var(--panel); padding: 36px 40px; border-radius: 14px; width: 360px; box-shadow: 0 20px 60px rgba(0,0,0,.35); }
.auth-card h1 { margin: 0 0 20px; text-align: center; letter-spacing: -1px; }
.auth-card h1 span, .brand span { color: var(--accent); }

/* Layout */
.app { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--sidebar); color: var(--sidebar-ink); display: flex; flex-direction: column; position: fixed; top: 0; bottom: 0; }
.brand { font-size: 20px; font-weight: 700; color: #fff; padding: 18px 20px 10px; letter-spacing: -0.5px; }
.gym-switch { padding: 0 14px 10px; }
.gym-switch select, .gym-switch input { width: 100%; background: #2a3245; color: #fff; border: 1px solid #3a4460; border-radius: 8px; padding: 7px; }
.gym-switch input::placeholder { color: #7a84a0; }
nav { flex: 1; overflow-y: auto; padding: 4px 0; }
nav a { display: block; padding: 8px 20px; color: var(--sidebar-ink); text-decoration: none; font-size: 13.5px; border-left: 3px solid transparent; }
nav a:hover { background: #252d40; color: #fff; }
nav a.active { background: #252d40; color: #fff; border-left-color: var(--accent); }
nav .nav-group { padding: 12px 20px 4px; font-size: 10.5px; text-transform: uppercase; letter-spacing: 1px; color: #7a84a0; }
.sidebar-footer { padding: 12px 20px; border-top: 1px solid #2a3245; font-size: 12.5px; }
main { flex: 1; margin-left: 220px; padding: 24px 30px; max-width: 1250px; }

/* Elements */
h2 { margin: 0 0 4px; letter-spacing: -0.5px; }
.sub { color: var(--muted); margin-bottom: 18px; }
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.toolbar .spacer { flex: 1; }
button, .btn { background: var(--accent); border: none; color: #fff; padding: 8px 14px; border-radius: 8px; cursor: pointer; font-size: 13.5px; font-weight: 600; }
button:hover { background: var(--accent-dark); }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button.ghost:hover { background: #eef2ff; }
button.small { padding: 4px 9px; font-size: 12px; }
button.danger { background: var(--red); }
button.green { background: var(--green); }
.link-btn { background: none; border: none; color: var(--accent); cursor: pointer; padding: 0; font-size: 12.5px; }
input, select, textarea { border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; font-size: 13.5px; font-family: inherit; background: #fff; color: var(--ink); }
input:focus, select:focus, textarea:focus { outline: 2px solid #c8d6ff; border-color: var(--accent); }
label { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin: 10px 0 4px; }

/* Cards & tables */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin-bottom: 18px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat .num { font-size: 24px; font-weight: 700; }
.stat .lbl { color: var(--muted); font-size: 12px; }
table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
th { text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); padding: 10px 12px; border-bottom: 1px solid var(--line); background: #fafbfd; }
td { padding: 9px 12px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: none; }
tr.clickable { cursor: pointer; }
tr.clickable:hover { background: #f5f8ff; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 11.5px; font-weight: 600; }
.badge.green { background: #e2f6ec; color: var(--green); }
.badge.red { background: #fbe7e8; color: var(--red); }
.badge.amber { background: #fdf3dd; color: var(--amber); }
.badge.blue { background: #e8eeff; color: var(--accent); }
.badge.gray { background: #eef0f4; color: var(--muted); }

/* Modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(15,20,35,.45); display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow-y: auto; z-index: 50; }
.modal { background: var(--panel); border-radius: 14px; width: 560px; max-width: 100%; padding: 24px 26px; box-shadow: 0 24px 70px rgba(0,0,0,.3); }
.modal h3 { margin: 0 0 6px; }
.modal .actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid input, .form-grid select, .form-grid textarea { width: 100%; }

/* Toast */
#toast-root { position: fixed; bottom: 20px; right: 20px; z-index: 100; display: flex; flex-direction: column; gap: 8px; }
.toast { background: #1d2433; color: #fff; padding: 11px 18px; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.25); font-size: 13.5px; animation: pop .18s ease; }
.toast.error { background: var(--red); }
@keyframes pop { from { transform: translateY(8px); opacity: 0; } }

/* Schedule grid */
.sched { display: grid; grid-template-columns: repeat(7, 1fr); gap: 10px; }
.sched .day { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; min-height: 120px; }
.sched .day h4 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; color: var(--muted); }
.sched .cls { border-left: 3px solid var(--accent); background: #f4f7ff; border-radius: 6px; padding: 6px 8px; margin-bottom: 6px; cursor: pointer; font-size: 12.5px; }
.sched .cls:hover { background: #e8eeff; }
.sched .cls .t { color: var(--muted); font-size: 11px; }

/* Settings tabs */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--line); margin-bottom: 16px; flex-wrap: wrap; }
.tabs button { background: none; color: var(--muted); border-radius: 8px 8px 0 0; padding: 9px 16px; font-weight: 600; }
.tabs button.active { color: var(--accent); box-shadow: inset 0 -2px 0 var(--accent); }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; line-height: 1.5; }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: 12px; }

/* Skill matrix */
.matrix { overflow-x: auto; }
.matrix td.sk { cursor: pointer; text-align: center; user-select: none; }
.matrix td.sk:hover { outline: 2px solid var(--accent); }

@media (max-width: 900px) {
  .sidebar { width: 64px; }
  .sidebar .brand { font-size: 12px; padding: 14px 8px; }
  nav a { padding: 8px 10px; font-size: 11px; }
  main { margin-left: 64px; padding: 16px; }
  .sched { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}