:root {
  --primary: #0f5e59;
  --primary-dark: #0a423e;
  --primary-light: #e6f2f1;
  --accent: #c8a24a;
  --ink: #1d2a28;
  --ink-soft: #52615e;
  --line: #dde5e3;
  --bg: #f7f9f8;
  --card: #ffffff;
  --danger: #b3372f;
  --success: #2e7d4f;
  --warn: #9a6b0f;
  --radius: 10px;
  --font: 'Segoe UI', 'Tahoma', 'Cairo', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4 { line-height: 1.4; margin: 0 0 .6rem; }

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: .7rem 1rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.brand span { color: var(--accent); }

.main-nav { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }

.main-nav a { color: var(--ink-soft); font-weight: 600; font-size: .95rem; }

.main-nav a.active { color: var(--primary); }

.header-actions { margin-inline-start: auto; display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

.page-title { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.2rem; }

.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: .95rem;
  font-weight: 700;
  padding: .55rem 1.2rem;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  transition: background .15s;
  text-align: center;
}

.btn:hover { background: var(--primary-dark); color: #fff; }

.btn-secondary { background: var(--primary-light); color: var(--primary-dark); }
.btn-secondary:hover { background: #d5e8e6; }

.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #8f2b25; }

.btn-ghost { background: transparent; color: var(--ink-soft); border: 1px solid var(--line); }
.btn-ghost:hover { background: #eef2f1; color: var(--ink); }

.btn-sm { padding: .3rem .8rem; font-size: .85rem; }

.btn-block { display: block; width: 100%; }

.btn:disabled { opacity: .5; cursor: not-allowed; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
}

.grid { display: grid; gap: 1.2rem; }
.grid-courses { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.grid-forms { grid-template-columns: 1fr 2fr; gap: 1.2rem; }
.grid-stats { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.course-card { display: flex; flex-direction: column; gap: .5rem; transition: border-color .15s; }
.course-card:hover { border-color: var(--primary); }
.course-card h3 { font-size: 1.05rem; margin: 0; }
.course-meta { color: var(--ink-soft); font-size: .85rem; }
.course-price { font-weight: 800; color: var(--primary); font-size: 1.1rem; }
.price-old { color: var(--ink-soft); text-decoration: line-through; font-size: .9rem; margin-inline-start: .4rem; font-weight: 400; }
.price-free { color: var(--success); }

.badge {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  padding: .15rem .6rem;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
}

.badge-success { background: #e2f2e8; color: var(--success); }
.badge-warn { background: #fbf0d7; color: var(--warn); }
.badge-danger { background: #f9e3e1; color: var(--danger); }

.alert { border-radius: var(--radius); padding: .8rem 1rem; margin-bottom: 1rem; font-weight: 600; font-size: .95rem; }
.alert-success { background: #e2f2e8; color: var(--success); }
.alert-error { background: #f9e3e1; color: var(--danger); }
.alert-info { background: var(--primary-light); color: var(--primary-dark); }

form label { display: block; font-weight: 700; font-size: .9rem; margin-bottom: .3rem; }

.form-group { margin-bottom: 1rem; }

input[type=text], input[type=email], input[type=password], input[type=number], input[type=tel], select, textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  padding: .55rem .8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
}

input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary-light); border-color: var(--primary); }

.field-error { color: var(--danger); font-size: .85rem; margin-top: .25rem; }

table.data {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: .92rem;
}

table.data th, table.data td { padding: .6rem .8rem; text-align: right; border-bottom: 1px solid var(--line); }

table.data th { background: var(--primary-light); color: var(--primary-dark); font-size: .85rem; }

table.data tr:last-child td { border-bottom: none; }

.auth-wrap { max-width: 440px; margin: 3rem auto; padding: 0 1rem; }

.stat-card { text-align: center; }
.stat-value { font-size: 1.7rem; font-weight: 800; color: var(--primary); }
.stat-label { color: var(--ink-soft); font-size: .9rem; }

.hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 3.5rem 1rem;
  text-align: center;
}

.hero h1 { font-size: 2rem; }
.hero p { max-width: 640px; margin: .8rem auto 1.4rem; color: #d9ebe9; }

.filters { display: flex; gap: .8rem; flex-wrap: wrap; align-items: flex-end; margin-bottom: 1.2rem; }
.filters .form-group { margin: 0; min-width: 160px; flex: 1; }

.pagination { display: flex; gap: .4rem; margin-top: 1.2rem; flex-wrap: wrap; }
.pagination a, .pagination span {
  padding: .35rem .8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-size: .9rem;
}
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

.lesson-list { list-style: none; margin: 0; padding: 0; }
.lesson-list li { display: flex; justify-content: space-between; gap: .8rem; padding: .5rem .2rem; border-bottom: 1px solid var(--line); font-size: .93rem; }
.lesson-list li:last-child { border-bottom: none; }

.learn-layout { display: grid; grid-template-columns: 300px 1fr; gap: 1.2rem; }

.video-frame { width: 100%; aspect-ratio: 16/9; border: none; border-radius: var(--radius); background: #000; }

.side-nav { list-style: none; margin: 0; padding: 0; }
.side-nav li a { display: block; padding: .5rem .8rem; border-radius: 8px; color: var(--ink-soft); font-weight: 600; font-size: .93rem; }
.side-nav li a.active, .side-nav li a:hover { background: var(--primary-light); color: var(--primary-dark); }

.empty-state { text-align: center; color: var(--ink-soft); padding: 2.5rem 1rem; }

.text-muted { color: var(--ink-soft); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.font-bold { font-weight: 700; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }

footer.site-footer { border-top: 1px solid var(--line); background: var(--card); margin-top: 3rem; padding: 1.5rem 1rem; text-align: center; color: var(--ink-soft); font-size: .9rem; }

@media (max-width: 860px) {
  .grid-forms { grid-template-columns: 1fr; }
  .learn-layout { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .header-inner { gap: .6rem; }
  .main-nav { order: 3; width: 100%; }
  .hero h1 { font-size: 1.5rem; }
  table.data { display: block; overflow-x: auto; }
}