/* ─── Zavly Fonts: Inter (SIL Open Font License) ───────────────────────────── */
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Light.ttf') format('truetype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* ── Zavly Brand Colors ── */
  --white: #ffffff;
  --off-white: #F5F5F3;
  --gray-50: #f5f5f3;
  --gray-100: #ebebeb;
  --gray-200: #d6d6d6;
  --gray-400: #a0a0a0;
  --gray-600: #6b6b6b;
  --gray-800: #2a2a2a;
  --black: #1A1A1A;

  /* Teal Palette */
  --accent: #1D9E75;
  --accent-dark: #085041;
  --accent-mid: #5DCAA5;
  --accent-light: #E1F5EE;
  --accent-border: #9FE1CB;

  /* Semantic */
  --danger: #c0392b;
  --danger-light: #fdf0ef;
  --success: #1D9E75;
  --success-light: #E1F5EE;
  --warning: #c47a1e;
  --warning-light: #fef8ec;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.06);
  --transition: 180ms ease;
  --sidebar-width: 240px;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--off-white);
  color: var(--black);
  min-height: 100vh;
  line-height: 1.6;
}
/* Global copy protection — applied to all elements */
*, *::before, *::after {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
/* Allow text selection only in form inputs and textareas */
input, textarea, [contenteditable],
input *, textarea *, [contenteditable] * {
  -webkit-user-select: text !important;
  -moz-user-select: text !important;
  -ms-user-select: text !important;
  user-select: text !important;
}
/* Ensure interactive elements work correctly */
label, button, .answer-option, .mg2-card, .mg-card,
.answer-option *, .mg2-card *, .mg-card * {
  cursor: pointer;
  pointer-events: auto;
}
input[type="date"] {
  font-family: 'Inter', system-ui, sans-serif;
  color-scheme: light;
}

h1, h2, h3 {
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Copy & Print Protection ────────────────────────────────────────────── */
.protected-content {
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}

@media print {
  .sidebar, .page-header .btn, .tab-link, .fc-answer-btns,
  .btn, nav, .sidebar-footer { display: none !important; }
  .main-content { margin-left: 0 !important; padding: 0 !important; }
  .mobile-menu-btn, .ifc-btns, .mg-board, .mg2-card { display: none !important; }
  .protected-content * {
    color: #888 !important;
    filter: blur(4px) !important;
  }
  body::before {
    content: "Drucken ist für diese Seite nicht gestattet.";
    display: block;
    text-align: center;
    font-size: 20px;
    padding: 40px;
    color: #c0392b;
  }
}

/* ─── Layout ─────────────────────────────────────────────────────────────── */

.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ─── Sidebar ─────────────────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-width);
  background: var(--accent-dark);
  border-right: none;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 200;
  transition: transform 250ms ease;
  overflow-y: auto;
}

.sidebar-logo {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--gray-100);
  flex-shrink: 0;
}

.sidebar-logo .logo-mark, .logo-wordmark {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 26px;
  font-weight: 300;
  color: #fff;
  letter-spacing: -0.5px;
  line-height: 1;
}

.sidebar-logo .logo-sub {
  font-size: 10px;
  color: rgba(255,255,255,.75);
  margin-top: 3px;
  letter-spacing: 0.04em;
  font-weight: 400;
}

.sidebar-nav {
  flex: 1;
  padding: 14px 10px;
  overflow-y: auto;
}

.nav-section-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,.3);
  padding: 8px 12px 4px;
  margin-top: 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  touch-action: manipulation;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,.6);
  font-size: 14px;
  font-weight: 400;
  transition: all var(--transition);
  margin-bottom: 2px;
}

.nav-link:hover { background: rgba(255,255,255,.08); color: #E1F5EE; text-decoration: none; }
.nav-link.active { background: rgba(255,255,255,.12); color: #E1F5EE; }
.nav-link svg { width: 16px; height: 16px; flex-shrink: 0; opacity: 0.7; }
.nav-link.active svg { opacity: 1; }

.sidebar-footer {
  padding: 14px 10px;
  border-top: 1px solid var(--gray-100);
  flex-shrink: 0;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}
.user-name { color: #fff; font-size: 13px; font-weight: 500; }
.user-role { color: rgba(255,255,255,.65); font-size: 11px; }

.user-avatar {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,.15);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

.logout-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,.75);
  font-size: 13px;
  margin-top: 4px;
  transition: all var(--transition);
  cursor: pointer;
  background: none; border: none; width: 100%; text-align: left;
  font-family: 'Inter', system-ui, sans-serif;
}
.logout-btn:hover {
  color: #fff;
  background: rgba(255,255,255,.08);
}

.logout-btn:hover { background: var(--danger-light); color: var(--danger); }

/* ─── Mobile menu button ──────────────────────────────────────────────────── */
.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 300;
  background: #085041;
  border: none;
  padding: 0 16px;
  cursor: pointer;
  height: 52px;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.mobile-menu-btn svg { color: #fff; }
.mobile-menu-btn::after {
  content: 'zavly';
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 20px;
  font-weight: 300;
  letter-spacing: -0.5px;
  color: #fff;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 150;
}

/* ─── Main Content ────────────────────────────────────────────────────────── */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 40px 48px;
  max-width: 1200px;
  min-width: 0;
}

/* ─── Page Header ─────────────────────────────────────────────────────────── */

.page-header {
  margin-bottom: 28px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header-left h1 {
  font-size: 26px;
  color: var(--black);
  letter-spacing: -0.02em;
}

.page-header-left p {
  color: var(--gray-600);
  margin-top: 4px;
  font-size: 14px;
}

/* ─── Tabs ─────────────────────────────────────────────────────────────── */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ─── Cards ───────────────────────────────────────────────────────────────── */

.card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.card-header h2 {
  font-size: 15px;
  color: var(--black);
}

.card-body { padding: 22px; }

/* ─── Course Grid ─────────────────────────────────────────────────────────── */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}

.course-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
  display: block;
}

.course-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--gray-200);
  transform: translateY(-2px);
  text-decoration: none;
}

.course-card-image {
  height: 130px;
  background: var(--gray-50);
  overflow: hidden;
  position: relative;
}

.course-card-image img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.course-card-image-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent-light) 0%, #d4ede9 100%);
  color: var(--accent);
}

.course-card-body { padding: 14px 18px 18px; }

.course-card-title {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  color: var(--black);
  margin-bottom: 5px;
}

.course-card-desc {
  font-size: 13px;
  color: var(--gray-600);
  line-height: 1.5;
}

.course-card-meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.meta-badge {
  font-size: 12px;
  color: var(--gray-600);
  display: flex; align-items: center; gap: 4px;
}

/* ─── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.4;
}

.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}
.btn-primary:hover { background: #155a4d; border-color: #155a4d; text-decoration: none; color: var(--white); }

.btn-secondary {
  background: var(--white);
  color: var(--gray-800);
  border-color: var(--gray-200);
}
.btn-secondary:hover { background: var(--gray-50); text-decoration: none; color: var(--gray-800); }

.btn-danger {
  background: var(--white);
  color: var(--danger);
  border-color: var(--gray-200);
}
.btn-danger:hover { background: var(--danger-light); border-color: var(--danger); text-decoration: none; }

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--gray-50); color: var(--black); text-decoration: none; }

.btn-sm { padding: 6px 12px; font-size: 13px; min-height: 36px; }
.btn-lg { padding: 12px 22px; font-size: 15px; }

/* ─── Forms ───────────────────────────────────────────────────────────────── */

.form-group { margin-bottom: 18px; }

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-800);
  margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  color: var(--black);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 107, 92, 0.1);
}

input::placeholder, textarea::placeholder {
  color: var(--gray-400);
  font-size: 13px;
}

textarea { resize: vertical; min-height: 100px; }

.form-hint {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 4px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ─── Table ───────────────────────────────────────────────────────────────── */

table { width: 100%; border-collapse: collapse; }

thead th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-400);
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-100);
}

tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--gray-100);
  font-size: 13px;
  color: var(--gray-800);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--gray-50); }
.table-actions { display: flex; gap: 6px; }

/* Responsive table wrapper */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ─── Alerts / Flash ──────────────────────────────────────────────────────── */

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-success { background: var(--success-light); color: #0f5144; border: 1px solid #9FE1CB; }
.alert-error { background: var(--danger-light); color: var(--danger); border: 1px solid #f5c6c2; }
.alert-warning { background: var(--warning-light); color: #8a5510; border: 1px solid #f8dca0; }

/* ─── Badges ──────────────────────────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-green { background: var(--accent-light); color: var(--accent); }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }
.badge-red { background: var(--danger-light); color: var(--danger); }

/* ─── Stats Row ───────────────────────────────────────────────────────────── */

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.stat-value {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 30px;
  color: var(--black);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 2px;
}

/* ─── Flashcards ──────────────────────────────────────────────────────────── */

.flashcard-scene {
  width: 100%;
  max-width: 600px;
  height: 320px;
  perspective: 1000px;
  cursor: pointer;
  margin-bottom: 24px;
}

.flashcard-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard-inner.flipped { transform: rotateY(180deg); }

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px;
  text-align: center;
}

.flashcard-front { background: var(--white); }
.flashcard-back { background: var(--accent); transform: rotateY(180deg); }

.flashcard-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  opacity: 0.5;
}

.flashcard-front .flashcard-label { color: var(--gray-600); }
.flashcard-back .flashcard-label { color: rgba(255,255,255,0.7); }

.flashcard-text {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 21px;
  line-height: 1.35;
}

.flashcard-front .flashcard-text { color: var(--black); }
.flashcard-back .flashcard-text { color: var(--white); }

/* ─── Test / Quiz ─────────────────────────────────────────────────────────── */

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding: 14px 18px;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  flex-wrap: wrap;
  gap: 10px;
}

.quiz-timer {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 20px;
  color: var(--black);
}

.quiz-timer.warning { color: var(--danger); }

.quiz-progress-bar {
  flex: 1;
  min-width: 80px;
  margin: 0 20px;
  height: 4px;
  background: var(--gray-100);
  border-radius: 2px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.question-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 18px;
}

.question-text {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 19px;
  color: var(--black);
  margin-bottom: 22px;
  line-height: 1.4;
}

.answer-options { display: flex; flex-direction: column; gap: 10px; }

.answer-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.answer-option:hover { border-color: var(--accent); background: var(--accent-light); }
.answer-option.selected { border-color: var(--accent); background: var(--accent-light); }
.answer-option.correct { border-color: var(--success); background: var(--success-light); }
.answer-option.incorrect { border-color: var(--danger); background: var(--danger-light); }

.answer-letter {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-600);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  transition: all var(--transition);
}

.answer-option.selected .answer-letter { background: var(--accent); color: var(--white); }
.answer-text { font-size: 14px; color: var(--black); }

/* ─── Result Screen ───────────────────────────────────────────────────────── */

.result-screen {
  max-width: 500px;
  margin: 0 auto;
  text-align: center;
  padding: 50px 20px;
}

.result-icon {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 22px;
  display: flex; align-items: center; justify-content: center;
  font-size: 36px;
}

.result-icon.pass { background: var(--success-light); }
.result-icon.fail { background: var(--danger-light); }

.result-score {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 52px;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 8px;
}

.result-score.pass { color: var(--accent); }
.result-score.fail { color: var(--danger); }

/* ─── Login ───────────────────────────────────────────────────────────────── */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--off-white);
  padding: 20px;
}

.login-box {
  width: 100%;
  max-width: 400px;
}

.login-logo {
  text-align: center;
  margin-bottom: 36px;
}

.login-logo h1 {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 52px;
  font-weight: 300;
  letter-spacing: -1.5px;
  color: #085041;
  line-height: 1;
  margin-bottom: 6px;
}

.login-logo p {
  font-size: 11px;
  font-weight: 400;
  color: #1D9E75;
  margin-top: 6px;
  letter-spacing: 0.04em;
}

.login-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
}

/* ─── Divider ─────────────────────────────────────────────────────────────── */

.divider {
  height: 1px;
  background: var(--gray-100);
  margin: 22px 0;
}

/* ─── Content body (rich text) ────────────────────────────────────────────── */

.content-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-800);
  max-width: 720px;
}

.content-body h2 { font-size: 20px; margin: 24px 0 10px; }
.content-body h3 { font-size: 17px; margin: 18px 0 8px; }
.content-body p { margin-bottom: 14px; }
.content-body ul, .content-body ol { padding-left: 20px; margin-bottom: 14px; }
.content-body li { margin-bottom: 5px; }
.content-body strong { font-weight: 600; }
.content-body blockquote { border-left: 3px solid var(--accent); padding-left: 14px; color: var(--gray-600); margin: 12px 0; }
.content-body img { max-width: 100%; border-radius: 8px; margin: 8px 0; }

/* ─── Empty State ─────────────────────────────────────────────────────────── */

.empty-state {
  text-align: center;
  padding: 50px 20px;
  color: var(--gray-400);
}

.empty-state svg { margin-bottom: 16px; opacity: 0.4; }
.empty-state h3 { font-size: 17px; color: var(--gray-600); margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* ─── Modal ───────────────────────────────────────────────────────────────── */

.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.3);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  padding: 16px;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 { font-size: 17px; }

.modal-close {
  background: none; border: none;
  cursor: pointer; color: var(--gray-400);
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition);
}

.modal-close:hover { color: var(--black); }
.modal-body { padding: 22px; }
.modal-footer {
  padding: 14px 22px;
  border-top: 1px solid var(--gray-100);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

/* ─── Misc helpers ────────────────────────────────────────────────────────── */

.text-muted { color: var(--gray-400); }
.text-sm { font-size: 13px; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.justify-between { justify-content: space-between; }

/* ─── Global SVG size normalization ──────────────────────────────────────── */
.logout-btn svg { width: 15px; height: 15px; flex-shrink: 0; }
.meta-badge svg { width: 13px; height: 13px; flex-shrink: 0; }
.card-header svg { width: 16px; height: 16px; flex-shrink: 0; }
.tab-link svg { width: 15px; height: 15px; flex-shrink: 0; }
svg { max-width: 100%; }

/* ─── Media embed blocks ─────────────────────────────────────────────────── */
.media-embed-block {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 12px 0;
  background: var(--gray-50);
}
.media-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-200);
  background: var(--white);
}
.media-label a { margin-left: auto; color: var(--accent); font-size: 12px; }

/* ─── Rich editor ──────────────────────────────────────────────────────────── */
.editor-area:empty:before { content: attr(data-placeholder); color: var(--gray-400); pointer-events: none; }
.pdf-embed-block { border: 1px solid var(--gray-200); border-radius: var(--radius); overflow: hidden; margin: 12px 0; background: var(--gray-50); }
.pdf-embed-block iframe { width: 100%; height: 480px; border: none; display: block; }
.pdf-embed-block .pdf-label { display: flex; align-items: center; gap: 8px; padding: 10px 14px; font-size: 13px; color: var(--gray-600); border-bottom: 1px solid var(--gray-200); background: var(--white); }

.rich-editor-wrap { border: 1px solid var(--gray-200); border-radius: var(--radius); overflow: hidden; background: var(--white); }
.editor-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 3px; padding: 6px 8px; background: var(--gray-50); border-bottom: 1px solid var(--gray-200); }
.editor-toolbar button, .editor-toolbar .img-upload-btn {
  font-size: 13px; padding: 4px 8px; border-radius: 4px;
  border: 1px solid transparent; background: transparent;
  cursor: pointer; color: var(--gray-700); line-height: 1.4;
  font-family: inherit; transition: background 120ms;
}
.editor-toolbar button:hover, .editor-toolbar .img-upload-btn:hover { background: var(--gray-200); }
.editor-toolbar .sep { width: 1px; height: 18px; background: var(--gray-200); margin: 0 2px; }
.editor-toolbar input[type="file"] { display: none !important; width: 0; height: 0; overflow: hidden; position: absolute; }
.editor-area {
  min-height: 180px; padding: 14px 16px; outline: none;
  font-size: 15px; line-height: 1.65; color: var(--black);
  background: var(--white); display: block; width: 100%; box-sizing: border-box;
  border-top: 2px solid var(--gray-200); cursor: text;
  font-family: 'Inter', system-ui, sans-serif;
}
.editor-area:focus { border-top-color: var(--accent); }
.editor-area h2 { font-size: 19px; margin: 14px 0 7px; }
.editor-area h3 { font-size: 15px; margin: 10px 0 5px; }
.editor-area p { margin: 0 0 9px; }
.editor-area ul, .editor-area ol { padding-left: 22px; margin-bottom: 9px; }
.editor-area blockquote { border-left: 3px solid var(--accent); padding-left: 14px; color: var(--gray-600); margin: 9px 0; }
.editor-area img { max-width: 100%; border-radius: 6px; margin: 6px 0; display: block; }

/* ─── XP / Level / Streak ───────────────────────────────────────────────────── */
.xp-bar-wrap { background: var(--gray-100); border-radius: 99px; height: 8px; overflow: hidden; }
.xp-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-mid)); border-radius: 99px; transition: width .5s cubic-bezier(.4,0,.2,1); }
.level-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-light); color: var(--accent); border-radius: 99px; padding: 4px 12px; font-size: 13px; font-weight: 600; }
.streak-fire { font-size: 32px; animation: flicker 1.8s ease-in-out infinite; }
@keyframes flicker { 0%,100% { transform: scale(1) rotate(-2deg); } 50% { transform: scale(1.08) rotate(2deg); } }

/* ─── Responsive ──────────────────────────────────────────────────────────── */

/* ─── Mobile: Tablet (≤900px) ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .main-content { padding: 32px 20px; }
  .stats-row { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
  .course-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
}

/* ─── Mobile: Phone (≤680px) ────────────────────────────────────────────────── */
@media (max-width: 680px) {
  /* Sidebar */
  :root { --sidebar-width: 0px; }
  .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
  .sidebar {
    width: 280px;
    transform: translateX(-100%);
    box-shadow: 0 0 40px rgba(0,0,0,.3);
    transition: transform 250ms ease;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }

  /* Main layout */
  .main-content {
    margin-left: 0 !important;
    padding: 68px 16px 28px;
  }

  /* Page header */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 20px;
  }
  .page-header-left h1 { font-size: 20px; }
  .page-header .btn { width: 100%; justify-content: center; }

  /* Cards */
  .card-body { padding: 14px; }
  .card-header { padding: 12px 14px; }
  .card-header h2 { font-size: 15px; }

  /* Grids → stacked */
  .course-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .form-row { grid-template-columns: 1fr !important; }
  [style*="grid-template-columns:1fr 1fr"] { grid-template-columns: 1fr !important; }
  [style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }
  [style*="grid-template-columns:repeat(auto-fit"] { grid-template-columns: 1fr !important; }

  /* Buttons */
  .btn-lg { padding: 11px 16px; font-size: 14px; }
  .table-actions { gap: 6px; }

  /* Tables → horizontal scroll */
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table-wrap table { min-width: 600px; }

  /* Tab nav */
  .tab-nav-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 1px;
  }
  .tab-nav-wrap::-webkit-scrollbar { display: none; }
  
.tab-link {
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 180ms ease, border-color 180ms ease;
  white-space: nowrap;
  cursor: pointer;
}
.tab-link:hover { color: var(--gray-800); text-decoration: none; }
.tab-link.active {
  color: var(--accent) !important;
  border-bottom: 2px solid var(--accent) !important;
  font-weight: 600;
}

  /* Login page */
  .login-box { padding: 0 12px; }
  .login-card { padding: 22px 18px; border-radius: 14px; }
  .login-logo h1 { font-size: 40px; }

  /* Course view */
  .unit-tile-header { padding: 12px 14px; }
  .block-item { padding: 12px 14px; }

  /* Flashcard player */
  .fc-layout { padding: 0; }
  .fc-stats { gap: 8px; }
  .fc-stat { padding: 8px 10px; }
  .fc-stat-val { font-size: 20px; }
  .fc-scene { height: 260px; }
  .fc-btn { padding: 11px 12px; font-size: 13px; }

  /* Integrated player */
  .ifc-scene { height: 240px; }
  .ifc-stats { gap: 6px; }
  .ifc-stat { padding: 7px 8px; }
  .ifc-btn { padding: 11px 10px; font-size: 13px; }

  /* Match game */
  .mg-board { grid-template-columns: 1fr; gap: 10px; }
  .mg-card { min-height: 50px; padding: 10px 12px; font-size: 13px; }

  /* Quiz/Test */
  .quiz-layout { padding: 0; }
  .question-text { font-size: 16px; }

  /* Admin modals */
  .modal { max-width: calc(100vw - 24px) !important; margin: 12px; max-height: calc(100vh - 40px); }
  .modal-body { max-height: calc(100vh - 200px); overflow-y: auto; }

  /* User management table */
  .table-wrap table { min-width: 700px; }

  /* XP widget in sidebar */
  #xp-widget { padding: 8px 10px; }

  /* Dashboard course cards */
  .course-card { border-radius: 12px; }
  .course-card-image { height: 110px; }

  /* Course color header in view */
  [style*="padding:24px 28px"] { padding: 18px 16px !important; }
  [style*="font-size:24px"][style*="color:#fff"] { font-size: 20px !important; }

  /* Admin edit grid */
  .admin-edit-grid { grid-template-columns: 1fr !important; }

  /* Admin page grids */
  [style*="grid-template-columns:1fr 340px"] { grid-template-columns: 1fr !important; }
  [style*="display:grid"][style*="minmax(320px"] { grid-template-columns: 1fr !important; }
  [style*="display:grid"][style*="minmax(360px"] { grid-template-columns: 1fr !important; }

  /* Settings/account two-col */
  [style*="max-width:560px"] { max-width: 100% !important; }
  [style*="max-width:580px"] { max-width: 100% !important; }
  [style*="max-width:480px"] { max-width: 100% !important; }
}

/* ─── Mobile: Small phone (≤420px) ─────────────────────────────────────────── */
@media (max-width: 420px) {
  .main-content { padding: 62px 12px 24px; }
  .card-body { padding: 12px; }
  .stat-value { font-size: 22px; }
  .result-score { font-size: 36px; }
  .login-card { padding: 20px 16px; }
  .login-logo h1 { font-size: 36px; }
  .stats-row { grid-template-columns: 1fr 1fr; gap: 8px; }
  .fc-scene { height: 220px; }
  
  .btn { font-size: 13px; padding: 8px 14px; }
  .page-header-left h1 { font-size: 18px; }
}

/* ─── Print protection ───────────────────────────────────────────────────── */

/* ─── Touch / Mobile UX improvements ──────────────────────────────────────── */
button, a, .btn, .nav-link, .tab-link, .course-card, .mg-card, .fc-btn, .ifc-btn {
  -webkit-tap-highlight-color: transparent;
}
.btn, button[type="submit"], 
/* Minimum touch target size (44px) */

input, select, textarea {
  font-size: 16px; /* Prevents iOS zoom on focus */
}

/* ─── Component styles (view, player, editor) ─────────────────────────── */

.unit-tile{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow-sm);transition:box-shadow var(--transition);}
.unit-tile:hover{box-shadow:var(--shadow);}

.unit-tile-header:hover{background:var(--gray-50);}

.unit-tile.open 
.unit-tile-body{display:none;border-top:1px solid var(--gray-100);}
.unit-tile.open .unit-tile-body{display:block;}

.block-item:last-child{border-bottom:none;}
.block-title{font-weight:600;font-size:15px;margin-bottom:10px;color:var(--black);}
.pdf-viewer-wrap{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--gray-200);margin-top:8px;}
.pdf-viewer-wrap::after{content:'';position:absolute;inset:0;pointer-events:none;}
.pdf-viewer-wrap iframe{width:100%;height:520px;border:none;display:block;}
.pdf-no-print-overlay{position:absolute;inset:0;background:transparent;pointer-events:none;}
.inline-fc{perspective:900px;cursor:pointer;height:160px;}
.inline-fc-inner{position:relative;width:100%;height:100%;transition:transform .5s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;}
.inline-fc.flipped .inline-fc-inner{transform:rotateY(180deg);}
.inline-fc-front,.inline-fc-back{position:absolute;top:0;left:0;right:0;bottom:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius);padding:16px 20px;display:flex;flex-direction:column;border:2px solid var(--gray-200);background:var(--white);box-shadow:var(--shadow-sm);overflow:hidden;}
.inline-fc-front:hover{border-color:var(--accent-mid);box-shadow:var(--shadow);}
.inline-fc-back{transform:rotateY(180deg);background:var(--accent-light);border-color:var(--accent);}
.inline-fc-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--gray-400);margin-bottom:8px;flex-shrink:0;}
.inline-fc-text{font-size:14px;line-height:1.55;color:var(--black);overflow-y:auto;}
.content-body ul,.content-body ol{padding-left:22px;margin-bottom:12px;}
@media(max-width:600px){.ifc-scene{height:220px;}
.ifc-stats{gap:5px;}

.ifc-layout{max-width:620px;margin:0 auto;}

.ifc-stat-val.g{color:var(--accent);}
.ifc-stat-val.r{color:var(--danger);}
.ifc-stat-val.gr{color:var(--gray-400);}
.ifc-stat-val.b{color:#5050cc;}
.ifc-stat-lbl{font-size:10px;color:var(--gray-400);margin-top:2px;}
.ifc-bar{height:5px;background:var(--gray-100);border-radius:3px;overflow:hidden;margin-bottom:18px;display:flex;}
.ifc-bar-k{background:var(--accent);transition:width .4s;}
.ifc-bar-u{background:#e8a0a0;transition:width .4s;}
.ifc-counter{text-align:center;font-size:13px;color:var(--gray-400);margin-bottom:10px;}
.ifc-scene{width:100%;height:280px;perspective:1200px;cursor:pointer;margin-bottom:14px;}
.ifc-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);}
.ifc-inner.flipped{transform:rotateY(180deg);}
.ifc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius);border:1px solid var(--gray-100);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 36px;text-align:center;}
.ifc-front{background:var(--white);}
.ifc-back{background:var(--accent);transform:rotateY(180deg);}
.ifc-face-lbl{font-size:11px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:10px;opacity:.5;}
.ifc-front .ifc-face-lbl{color:var(--gray-600);}
.ifc-back .ifc-face-lbl{color:rgba(255,255,255,.8);}
.ifc-face-txt{font-family:'Inter',serif;font-size:20px;line-height:1.4;}
.ifc-front .ifc-face-txt{color:var(--black);}
.ifc-back .ifc-face-txt{color:#fff;}
.ifc-hint{font-size:12px;color:var(--gray-400);text-align:center;margin-bottom:12px;min-height:16px;}
.ifc-btns{display:flex;gap:12px;justify-content:center;}
.ifc-btn{flex:1;max-width:190px;padding:13px 18px;border-radius:var(--radius);font-family:'Inter',sans-serif;font-size:14px;font-weight:600;cursor:pointer;border:2px solid transparent;transition:all .15s ease;display:flex;flex-direction:column;align-items:center;gap:3px;}
.ifc-btn-sub{font-size:10px;font-weight:400;opacity:.7;}
.ifc-btn-k{background:var(--accent-light);color:var(--accent);border-color:var(--accent);}
.ifc-btn-k:hover{background:var(--accent);color:#fff;}
.ifc-btn-u{background:var(--danger-light);color:var(--danger);border-color:var(--danger);}
.ifc-btn-u:hover{background:var(--danger);color:#fff;}
#ifc-done{display:none;text-align:center;padding:32px 0;}
.ifc-done-ring{width:72px;height:72px;border-radius:50%;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:32px;margin:0 auto 16px;}
@media(max-width:500px){.mg-board{grid-template-columns:1fr;gap:10px;}
.mg-col-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--gray-400);margin-bottom:10px;}
.mg-col{display:flex;flex-direction:column;gap:8px;}
.mg2-card{padding:14px 16px;border-radius:10px;border:2px solid var(--gray-200);background:var(--white);cursor:pointer;font-size:14px;line-height:1.5;transition:border-color 150ms,background 150ms,transform 150ms;user-select:none;word-break:break-word;display:flex;align-items:center;min-height:60px;}
.mg2-card:hover{border-color:var(--accent-mid);background:var(--accent-light);}
.mg2-card.sel{border-color:var(--accent);background:var(--accent-light);transform:scale(1.02);box-shadow:0 0 0 3px rgba(29,158,117,.15);}
.mg2-card.done{border-color:var(--accent);background:var(--accent-light);color:var(--accent);cursor:default;font-weight:500;opacity:.65;}
.mg2-card.bad{border-color:var(--danger);background:var(--danger-light);animation:mg2-shake .35s ease;}
@keyframes mg2-shake{0%,100%{transform:translateX(0)}
@media print {
  .pdf-viewer-wrap, .pdf-viewer-wrap * { display:none !important; visibility:hidden !important; }
."; display:block; text-align:center; font-size:18px; margin-top:100px; }
}

.fc-layout{max-width:680px;margin:0 auto;}

.fc-stat-val.green{color:var(--accent);}
.fc-stat-val.red{color:var(--danger);}
.fc-stat-val.gray{color:var(--gray-400);}
.fc-stat-val.blue{color:#5050cc;}
.fc-stat-lbl{font-size:11px;color:var(--gray-400);margin-top:2px;}
.fc-progress-bar{height:5px;background:var(--gray-100);border-radius:3px;overflow:hidden;margin-bottom:22px;display:flex;}
.fc-progress-known{background:var(--accent);transition:width .4s ease;}
.fc-progress-unknown{background:#e8a0a0;transition:width .4s ease;}
.fc-counter{text-align:center;font-size:13px;color:var(--gray-400);margin-bottom:12px;}
.fc-scene{width:100%;height:300px;perspective:1200px;cursor:pointer;margin-bottom:16px;}
.fc-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);}
.fc-inner.flipped{transform:rotateY(180deg);}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius);border:1px solid var(--gray-100);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:36px 40px;text-align:center;}
.fc-front{background:var(--white);}
.fc-back{background:var(--accent);transform:rotateY(180deg);}
.fc-face-label{font-size:11px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;opacity:.5;}
.fc-front .fc-face-label{color:var(--gray-600);}
.fc-back .fc-face-label{color:rgba(255,255,255,.8);}
.fc-face-text{font-family:'Inter',serif;font-size:21px;line-height:1.4;}
.fc-front .fc-face-text{color:var(--black);}
.fc-back .fc-face-text{color:#fff;}
.fc-hint{font-size:12px;color:var(--gray-400);text-align:center;margin-bottom:14px;min-height:18px;}
.fc-answer-btns{display:flex;gap:12px;justify-content:center;}
.fc-btn{flex:1;max-width:200px;padding:14px 20px;border-radius:var(--radius);font-family:'Inter',sans-serif;font-size:15px;font-weight:600;cursor:pointer;border:2px solid transparent;transition:all .15s ease;display:flex;flex-direction:column;align-items:center;gap:4px;}
.fc-btn-sub{font-size:11px;font-weight:400;opacity:.7;}
.fc-btn-known{background:var(--accent-light);color:var(--accent);border-color:var(--accent);}
.fc-btn-known:hover{background:var(--accent);color:#fff;}
.fc-btn-unknown{background:var(--danger-light);color:var(--danger);border-color:var(--danger);}
.fc-btn-unknown:hover{background:var(--danger);color:#fff;}
.kbd{display:inline-block;background:var(--gray-100);border:1px solid var(--gray-200);border-radius:4px;padding:1px 6px;font-size:11px;font-family:monospace;}
@media(max-width:600px){.fc-scene{height:220px;}

#fc-done{display:none;text-align:center;padding:40px 0;}
.fc-done-ring{width:80px;height:80px;border-radius:50%;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:36px;margin:0 auto 20px;}

.unit-card{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius);margin-bottom:14px;box-shadow:var(--shadow-sm);}
.unit-header{display:flex;align-items:center;gap:12px;padding:14px 18px;cursor:pointer;user-select:none;border-radius:var(--radius);}
.unit-header:hover{background:var(--gray-50);}

.unit-card.open 
.unit-title{flex:1;font-weight:600;font-size:15px;color:var(--black);}
.unit-body{display:none;border-top:1px solid var(--gray-100);}
.unit-card.open .unit-body{display:block;}
.block-row{display:flex;align-items:center;gap:10px;padding:10px 18px;border-bottom:1px solid var(--gray-50);}
.block-row:last-child{border-bottom:none;}
.block-type-badge{font-size:11px;padding:2px 8px;border-radius:20px;font-weight:500;background:var(--gray-100);color:var(--gray-600);}
.block-type-badge.text{background:#E1F5EE;color:var(--accent);}
.block-type-badge.pdf{background:#fef3e2;color:#c07800;}
.block-type-badge.video{background:#e8e8ff;color:#5050cc;}
.block-type-badge.audio{background:#ffe8f3;color:#c0006a;}
.add-block-form{padding:14px 18px;background:var(--gray-50);border-top:1px solid var(--gray-100);}
@media(max-width:600px){.tab-link{padding:8px 10px;font-size:13px;}
.edit-tab-nav{overflow-x:auto;-webkit-overflow-scrolling:touch;}

/* ─── Memory Game ───────────────────────────────────────────────────────────── */
.mem-card {
  aspect-ratio: 1;
  cursor: pointer;
  perspective: 600px;
  border-radius: 12px;
  -webkit-tap-highlight-color: transparent;
}
.mem-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.35s ease;
  border-radius: 12px;
}
.mem-card.flipped .mem-card-inner,
.mem-card.matched .mem-card-inner {
  transform: rotateY(180deg);
}
.mem-card-front,
.mem-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  line-height: 1.4;
  padding: 10px;
  text-align: center;
  word-break: break-word;
  overflow: hidden;
}
.mem-card-front {
  background: var(--accent);
  color: #fff;
  font-size: 26px;
  font-weight: 300;
  border: 2px solid var(--accent);
}
.mem-card-back {
  background: #fff;
  border: 2px solid var(--gray-200);
  transform: rotateY(180deg);
  color: var(--gray-800);
}
.mem-card.matched .mem-card-back {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}
.mem-card:hover:not(.flipped):not(.matched) .mem-card-front {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}
@media (max-width: 500px) {
  .mem-card-front  { font-size: 20px; padding: 6px; }
  .mem-card-back   { font-size: 11px; padding: 6px; }
}