* {
  box-sizing: border-box;
}

:root {
  --bg: #08111f;
  --panel: #0f1b31;
  --text: #f7f8fb;
  --muted: #b1bdd3;
  --primary: #5c8cff;
  --primary-dark: #4a74d4;
  --success: #23b26d;
  --danger: #ff6f6f;
  --warning: #ffbe55;
  --border: rgba(145, 168, 214, 0.18);
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.32);
  --radius: 20px;
  --card: rgba(13, 25, 47, 0.92);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(92, 140, 255, 0.28), transparent 30%),
    radial-gradient(circle at top right, rgba(35, 178, 109, 0.12), transparent 25%),
    var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(8, 17, 31, 0.88);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav-links,
.hero-actions,
.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-link,
.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s ease;
}

.nav-link {
  color: var(--muted);
}

.nav-link:hover {
  color: var(--text);
}

.button,
button {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 16px 38px rgba(92, 140, 255, 0.26);
}

.button:hover,
button:hover {
  transform: translateY(-1px);
  background: var(--primary-dark);
}

.button-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: none;
}

.button-danger {
  background: rgba(255, 111, 111, 0.16);
  border: 1px solid rgba(255, 111, 111, 0.26);
  color: #ffe1e1;
  box-shadow: none;
}

.hero {
  padding: 56px 0 48px;
}

.hero-grid,
.feature-grid,
.stats-grid,
.dashboard-grid {
  display: grid;
  gap: 24px;
}

.hero-grid,
.dashboard-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.metric-card,
.form-card,
.hero-card,
.status-card {
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(92, 140, 255, 0.14);
  color: #cbd8ff;
  font-size: 0.84rem;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.05;
  margin-bottom: 18px;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin-bottom: 14px;
}

h3 {
  font-size: 1.12rem;
  margin-bottom: 10px;
}

p,
label {
  color: var(--muted);
  line-height: 1.65;
}

.metric-value {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: #fff;
  margin: 12px 0 8px;
}

.section {
  padding: 18px 0 48px;
}

.form-card {
  width: min(100%, 560px);
  margin: 40px auto;
}

.form-grid {
  display: grid;
  gap: 18px;
}

.split-fields,
.stats-inline,
.item-actions,
.file-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.split-fields > * {
  flex: 1 1 220px;
}

label {
  display: grid;
  gap: 8px;
  font-size: 0.96rem;
}

input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  outline: none;
}

input[type="file"] {
  padding: 12px;
}

input:focus {
  border-color: rgba(92, 140, 255, 0.75);
  box-shadow: 0 0 0 4px rgba(92, 140, 255, 0.12);
}

.alert {
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid transparent;
}

.alert-danger {
  background: rgba(255, 111, 111, 0.12);
  border-color: rgba(255, 111, 111, 0.2);
  color: #ffd0d0;
}

.alert-success {
  background: rgba(35, 178, 109, 0.14);
  border-color: rgba(35, 178, 109, 0.22);
  color: #d8ffe8;
}

.alert-warning {
  background: rgba(255, 190, 85, 0.12);
  border-color: rgba(255, 190, 85, 0.2);
  color: #ffecc7;
}

.kpi-label {
  color: var(--muted);
  font-size: 0.92rem;
}

.tag {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #e4ebff;
  background: rgba(92, 140, 255, 0.16);
}

.footer {
  padding: 24px 0 32px;
  text-align: center;
  color: var(--muted);
}

.empty-state {
  padding: 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--border);
}

.list-header {
  margin-bottom: 20px;
}

.cards-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.course-card {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.course-thumb {
  aspect-ratio: 9 / 16;
  background: rgba(255, 255, 255, 0.04);
}

.course-thumb img,
.media-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.course-thumb-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  color: var(--muted);
}

.course-body {
  padding: 22px;
}

.media-preview {
  max-width: 200px;
  aspect-ratio: 9 / 16;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.inline-form {
  margin: 0;
}

.file-link {
  color: #cbd8ff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  .hero-grid,
  .dashboard-grid,
  .feature-grid,
  .stats-grid,
  .cards-grid {
    grid-template-columns: 1fr;
  }

  .navbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 20px, 1120px);
  }

  .card,
  .metric-card,
  .form-card,
  .hero-card,
  .status-card {
    padding: 20px;
  }

  .button,
  .button-secondary,
  button {
    width: 100%;
  }

  .hero-actions,
  .form-actions,
  .split-fields,
  .stats-inline,
  .item-actions,
  .file-links {
    flex-direction: column;
  }
}