/* ==============================
   AL ICT Learning Hub - Styles
   Dark modern responsive design
================================= */

/* Global reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* CSS color variables for easy changes */
:root {
  --bg: #080b12;
  --panel: #111827;
  --panel-light: #172033;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --primary-dark: #0284c7;
  --success: #22c55e;
  --danger: #ef4444;
  --border: rgba(255, 255, 255, 0.1);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

/* Body */
body {
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 35%),
    radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.12), transparent 35%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 18px 6%;
  background: rgba(8, 11, 18, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);

}

/* Brand section */
.brand{
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Logo */
.logo{
    width: 55px;
    height: 55px;
    border-radius: 50%;
    object-fit: cover;
}



.topbar h1 {
  font-size: 24px;
  margin-bottom: 4px;
}

.topbar p {
  color: var(--muted);
  font-size: 14px;
}

.top-actions {
  display: flex;
  gap: 10px;
}

/* Main container */
.container {
  width: min(1180px, 92%);
  margin: 32px auto;
}

/* View switching */
.view {
  display: none;
}

.view.active {
  display: block;
}

/* Section title */
.section-title {
  margin-bottom: 24px;
}

.section-title h2 {
  font-size: 32px;
  margin-bottom: 8px;
}

.section-title p {
  color: var(--muted);
}

/* Buttons */
.btn {
  border: none;
  border-radius: 12px;
  padding: 11px 16px;
  color: white;
  cursor: pointer;
  font-weight: 700;
  transition: 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.btn.secondary {
  background: var(--panel-light);
  border: 1px solid var(--border);
}

.btn.success {
  background: var(--success);
}

.btn.danger {
  background: var(--danger);
}

/* Dashboard cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.topic-card {
  background: linear-gradient(180deg, var(--panel-light), var(--panel));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: 0.25s ease;
}

.topic-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.5);
}

.topic-icon {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-size: 26px;
  background: rgba(56, 189, 248, 0.14);
  margin-bottom: 16px;
}

.topic-card h3 {
  font-size: 21px;
  margin-bottom: 8px;
}

.topic-card p {
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.1);
  margin: 10px 0;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
}

.progress-text {
  font-size: 13px;
  color: var(--muted);
}

/* Course layout */
.back-btn {
  margin-bottom: 18px;
}

.course-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
}

.video-panel,
.lesson-sidebar,
.admin-card {
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.video-panel {
  padding: 22px;
}

.course-header {
  margin-bottom: 18px;
}

.badge {
  display: inline-block;
  color: var(--primary);
  background: rgba(56, 189, 248, 0.12);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
  margin-bottom: 10px;
}

.course-header h2 {
  font-size: 28px;
  margin-bottom: 8px;
}

.course-header p,
.lesson-info p,
.muted {
  color: var(--muted);
  line-height: 1.6;
}

/* YouTube responsive video */
.video-wrapper {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: black;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.video-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* Lesson info */
.lesson-info {
  margin-bottom: 18px;
}

.lesson-info h3 {
  margin-bottom: 8px;
}

/* Materials */
.materials-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 18px;
}

.materials-box h4 {
  margin-bottom: 10px;
}

.material-link {
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  margin-right: 12px;
  margin-bottom: 8px;
}

.material-link:hover {
  text-decoration: underline;
}

.lesson-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Lesson sidebar */
.lesson-sidebar {
  padding: 18px;
  max-height: 760px;
  overflow: auto;
}

.lesson-sidebar h3 {
  margin-bottom: 14px;
}

.lesson-item {
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.035);
  margin-bottom: 10px;
  cursor: pointer;
  transition: 0.2s ease;
}

.lesson-item:hover,
.lesson-item.active {
  border-color: var(--primary);
  background: rgba(56, 189, 248, 0.1);
}

.lesson-item h4 {
  font-size: 15px;
  margin-bottom: 6px;
}

.lesson-item p {
  font-size: 13px;
  color: var(--muted);
}

.watched {
  color: var(--success);
  font-weight: bold;
}

/* Admin */
.admin-warning {
  background: rgba(250, 204, 21, 0.12);
  border: 1px solid rgba(250, 204, 21, 0.3);
  color: #fde68a;
  padding: 14px;
  border-radius: 16px;
  margin-bottom: 18px;
}

.admin-card {
  padding: 20px;
  margin-bottom: 20px;
}

.admin-card h3 {
  margin-bottom: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

input,
textarea,
select {
  width: 100%;
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  padding: 12px;
  outline: none;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--primary);
}

/* Admin content list */
.admin-topic {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.035);
}

.admin-topic-header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}

.admin-lesson {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.backup-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.file-label {
  background: var(--panel-light);
  border: 1px solid var(--border);
  padding: 11px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
}

.file-label input {
  display: none;
}

/* Toast */
.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: var(--panel-light);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 18px;
  border-radius: 14px;
  box-shadow: var(--shadow);
  display: none;
}

.toast.show {
  display: block;
}

/* Tablet responsive */
@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .course-layout {
    grid-template-columns: 1fr;
  }

  .lesson-sidebar {
    max-height: none;
  }
}

/* Mobile responsive */
@media (max-width: 620px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-actions,
  .lesson-actions,
  .backup-actions {
    width: 100%;
  }

  .btn,
  .file-label {
    width: 100%;
    text-align: center;
  }

  .card-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .section-title h2 {
    font-size: 26px;
  }

  .course-header h2 {
    font-size: 24px;
  }
}