:root {
  --bg: #0a0d11;
  --panel: #131a22;
  --panel-2: #1c2633;
  --line: #263242;
  --text: #f2f5f8;
  --muted: #9babbc;
  --accent: #34d399;
  --accent-2: #60a5fa;
  --danger: #f87171;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: linear-gradient(180deg, #090c10 0%, #0e1319 100%);
  color: var(--text);
}
.hidden { display: none !important; }
.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(460px, 100%);
  background: rgba(19, 26, 34, 0.95);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  display: grid;
  gap: 18px;
  box-shadow: 0 24px 60px rgba(0,0,0,.32);
}
.login-card h1, .sidebar h1, .topbar h2, .hero-card h3, .detail-panel h3 { margin: 0; }
.eyebrow { color: var(--accent); font-size: 12px; letter-spacing: .18em; text-transform: uppercase; margin-bottom: 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.login-form { display: grid; gap: 14px; }
.login-form label { display: grid; gap: 8px; }
.login-form input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #0f151d;
  color: var(--text);
  padding: 14px 15px;
  font: inherit;
}
.primary-btn, .secondary-btn {
  border: 0;
  border-radius: 14px;
  padding: 13px 16px;
  font: inherit;
  cursor: pointer;
}
.primary-btn {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #071014;
  font-weight: 700;
}
.secondary-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
}
.error-text {
  margin: 0;
  color: var(--danger);
  font-size: 14px;
}
.app-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.sidebar {
  border-right: 1px solid var(--line);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  background: rgba(10, 13, 17, 0.95);
  position: sticky;
  top: 0;
  height: 100vh;
}
.nav { display: grid; gap: 10px; }
.nav-link {
  display: block; padding: 12px 14px; border-radius: 14px; background: var(--panel);
  border: 1px solid var(--line); color: var(--text); text-decoration: none;
}
.nav-link.active { background: linear-gradient(90deg, rgba(52,211,153,.18), rgba(96,165,250,.15)); }
.nav-link.disabled { opacity: .45; }
.session-box {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.main { padding: 28px; display: grid; gap: 22px; }
.topbar { display: flex; justify-content: space-between; align-items: end; gap: 16px; }
.hero-card {
  display: flex; justify-content: space-between; gap: 24px; align-items: center;
  padding: 22px; border-radius: 22px; background: linear-gradient(135deg, rgba(52,211,153,.12), rgba(96,165,250,.1));
  border: 1px solid rgba(96,165,250,.18);
}
.hero-card p { margin-bottom: 0; }
.hero-stats { display: flex; gap: 12px; flex-wrap: wrap; }
.stat {
  min-width: 140px; padding: 14px; border-radius: 16px; background: rgba(0,0,0,.22); border: 1px solid rgba(255,255,255,.08);
  display: grid; gap: 6px;
}
.stat strong { font-size: 22px; }
.workouts-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: rgba(52,211,153,.45); box-shadow: 0 16px 40px rgba(0,0,0,.28); }
.card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; background: #0b1015; }
.card-body { padding: 16px; display: grid; gap: 10px; }
.card-title-row { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.card h3 { margin: 0; font-size: 23px; }
.rating { color: var(--accent); font-weight: 700; }
.card-meta { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 10px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--panel-2); font-size: 13px;
}
.detail-modal {
  width: min(1100px, calc(100vw - 24px)); border: 1px solid var(--line); border-radius: 24px; padding: 0; background: var(--panel); color: var(--text);
}
.detail-modal::backdrop { background: rgba(0,0,0,.7); }
.modal-content { position: relative; padding: 22px; }
.close-btn {
  position: absolute; top: 12px; right: 12px; width: 40px; height: 40px; border: 0; border-radius: 999px;
  background: rgba(255,255,255,.08); color: white; font-size: 24px; cursor: pointer;
}
.modal-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) 360px; gap: 20px; align-items: start; }
.video-wrap video { width: 100%; border-radius: 18px; background: black; max-height: 72vh; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.detail-meta { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.detail-meta li { padding: 12px 14px; border-radius: 14px; background: var(--panel-2); border: 1px solid var(--line); }
@media (max-width: 1100px) {
  .workouts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .modal-layout { grid-template-columns: 1fr; }
}
@media (max-width: 780px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .workouts-grid { grid-template-columns: 1fr; }
  .hero-card { flex-direction: column; align-items: start; }
  .main { padding: 18px; }
}