:root {
  --bg: #07131a;
  --panel: rgba(14, 32, 42, 0.82);
  --line: rgba(148, 163, 184, 0.22);
  --snow: #f8fafc;
  --mist: #94a3b8;
  --teal: #14b8a6;
  --coral: #fb7185;
  --amber: #f59e0b;
}

* { box-sizing: border-box; }

html, body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--snow);
  font-family: "IBM Plex Sans Arabic", system-ui, sans-serif;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--teal); }

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(20, 184, 166, 0.22), transparent 60%),
    radial-gradient(700px 420px at 100% 0%, rgba(2, 132, 199, 0.18), transparent 55%),
    linear-gradient(180deg, #061018, #0a1a22 50%, #07131a);
}

.app-shell { min-height: 100vh; padding-bottom: 48px; }

.glass {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  backdrop-filter: blur(12px);
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 20;
  margin: 12px 16px 0;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--mist);
}

.btn-soft {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  color: var(--snow);
  border-radius: 12px;
  padding: 8px 14px;
  font-size: 13px;
}
.btn-soft:hover { border-color: var(--teal); color: var(--teal); }

.btn-teal {
  background: linear-gradient(135deg, #14b8a6, #0d9488);
  border: none;
  color: #042f2e;
  font-weight: 700;
  border-radius: 12px;
  padding: 10px 16px;
}
.btn-teal:hover { filter: brightness(1.05); color: #042f2e; }

.btn-amber {
  background: rgba(245, 158, 11, 0.16);
  border: 1px solid rgba(245, 158, 11, 0.45);
  color: #fbbf24;
  border-radius: 12px;
  padding: 8px 14px;
  font-size: 13px;
}

.btn-danger-soft {
  background: rgba(251, 113, 133, 0.12);
  border: 1px solid rgba(251, 113, 133, 0.4);
  color: #fda4af;
  border-radius: 12px;
  padding: 6px 10px;
  font-size: 12px;
}

.page { max-width: 980px; margin: 0 auto; padding: 24px 20px 48px; }

.course-card, .lesson-card, .task-card {
  display: block;
  padding: 16px 18px;
  transition: transform .18s ease, border-color .18s ease;
}
.course-card:hover, .lesson-card:hover, .task-card:hover {
  transform: translateY(-2px);
  border-color: rgba(20, 184, 166, 0.45);
  color: inherit;
}

.badge-num {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.field, .form-control, .form-select, textarea.form-control {
  background: rgba(0,0,0,0.28) !important;
  border: 1px solid var(--line) !important;
  color: var(--snow) !important;
  border-radius: 12px !important;
}
.form-control:focus, .form-select:focus {
  box-shadow: 0 0 0 .2rem rgba(20,184,166,.2) !important;
  border-color: var(--teal) !important;
}
.form-select option { color: #111; }

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.task-body {
  white-space: pre-wrap;
  line-height: 1.85;
  background: rgba(0,0,0,0.22);
  border-radius: 14px;
  padding: 16px;
}

.link-prompt {
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}

.flash {
  padding: 12px;
  border-radius: 12px;
  background: rgba(20,184,166,0.12);
  color: var(--teal);
  font-weight: 600;
  text-align: center;
}

.btn-teal#btn-random-task,
#btn-random-task {
  font-weight: 800;
}

.section-title {
  font-size: 18px;
  font-weight: 800;
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(20,184,166,0.35);
}

.media-box video, .media-box img {
  width: 100%;
  max-height: 380px;
  border-radius: 12px;
  object-fit: contain;
  background: rgba(0,0,0,0.25);
}

.muted { color: var(--mist); }
.text-coral { color: var(--coral); }

@media (max-width: 576px) {
  .hide-mobile { display: none !important; }
}