/* ============================================
   Online Lessons By Tofu — Global Styles
   Dark mode, Glassmorphism, Mobile-first
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ---- CSS Variables ---- */
:root {
  --primary: #7C3AED;
  --primary-light: #A78BFA;
  --primary-dark: #5B21B6;
  --secondary: #06B6D4;
  --accent: #F59E0B;
  --danger: #EF4444;
  --success: #10B981;

  --bg-dark: #0F0F1A;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.08);
  --bg-input: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.1);
  --border-focus: rgba(124,58,237,0.6);

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #475569;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
  --shadow-purple: 0 8px 32px rgba(124,58,237,0.25);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --nav-h: 64px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Prompt', 'Inter', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; outline: none; font-family: inherit; }
input, textarea, select { font-family: inherit; outline: none; }

/* ---- Background Gradient ---- */
.bg-gradient {
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(124,58,237,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(6,182,212,0.1) 0%, transparent 50%),
    var(--bg-dark);
  min-height: 100vh;
}

/* ---- Glass Card ---- */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.glass-sm {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ---- Top Navbar ---- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  background: rgba(15,15,26,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.navbar-brand .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.navbar-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  flex: 1;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 0 8px;
}
.navbar-menu::-webkit-scrollbar { display: none; }
.nav-item {
  position: relative;
}
.nav-btn {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  transition: var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-btn:hover, .nav-btn.active {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}
.nav-btn .nav-arrow {
  font-size: 0.65rem;
  transition: transform 0.2s;
}
.nav-item:hover .nav-arrow { transform: rotate(180deg); }

/* ---- Dropdown Menu ---- */
.nav-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: rgba(20,20,35,0.97);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 2000;
  overflow: hidden;
  animation: dropIn 0.15s ease;
}
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.nav-item:hover .nav-dropdown { display: block; }
.dropdown-section {
  padding: 6px;
}
.dropdown-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 6px 10px 4px;
  font-weight: 600;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.dropdown-item:hover {
  background: rgba(124,58,237,0.15);
  color: var(--primary-light);
}
.dropdown-item .lesson-num {
  font-size: 0.7rem;
  background: rgba(124,58,237,0.2);
  color: var(--primary-light);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

/* ---- Navbar Right Actions ---- */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.nav-icon-btn {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
}
.nav-icon-btn:hover {
  background: rgba(124,58,237,0.2);
  border-color: var(--primary);
  color: var(--primary-light);
}
.student-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  border-radius: 20px;
  background: rgba(124,58,237,0.15);
  border: 1px solid rgba(124,58,237,0.3);
  font-size: 0.78rem;
  color: var(--primary-light);
  cursor: pointer;
}
.student-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
}

/* ---- Mobile Hamburger ---- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  border-radius: 8px;
  transition: var(--transition);
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile Sidebar ---- */
.mobile-sidebar {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0; bottom: 0;
  z-index: 999;
  background: rgba(15,15,26,0.97);
  backdrop-filter: blur(20px);
  overflow-y: auto;
  padding: 16px;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-sidebar.open {
  transform: translateX(0);
}
.mobile-sidebar-section {
  margin-bottom: 8px;
}
.mobile-sidebar-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.mobile-grades {
  display: none;
  padding: 4px 8px;
  margin-bottom: 4px;
}
.mobile-grades.open { display: block; }
.mobile-grade-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  border: none;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}
.mobile-lessons {
  display: none;
  padding: 4px 8px;
}
.mobile-lessons.open { display: block; }
.mobile-lesson-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: left;
  transition: var(--transition);
}
.mobile-lesson-btn:hover { color: var(--primary-light); }

/* ---- Main Content Area ---- */
.main-content {
  padding-top: calc(var(--nav-h) + 24px);
  min-height: 100vh;
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}
.content-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---- Welcome / Home Screen ---- */
.home-welcome {
  text-align: center;
  padding: 60px 20px 40px;
}
.home-welcome h1 {
  font-size: clamp(1.6rem, 5vw, 2.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.home-welcome p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto 32px;
}
.quick-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Lesson Content Container ---- */
#lesson-container {
  min-height: 400px;
  animation: fadeIn 0.4s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.lesson-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.lesson-breadcrumb {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.lesson-breadcrumb span { color: var(--primary-light); }
#lesson-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}
#lesson-body {
  color: var(--text-primary);
  line-height: 1.8;
}
#lesson-body h1,
#lesson-body h2,
#lesson-body h3 { color: var(--text-primary); margin: 1em 0 0.5em; }
#lesson-body p { color: var(--text-secondary); margin-bottom: 1em; }
#lesson-body img { border-radius: var(--radius-md); margin: 1em 0; max-width: 100%; }
#lesson-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.9rem;
}
#lesson-body table th {
  background: rgba(124,58,237,0.2);
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid rgba(124,58,237,0.4);
}
#lesson-body table td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
}

/* ---- Loading Spinner ---- */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px;
  gap: 16px;
  color: var(--text-muted);
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-purple);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 40px rgba(124,58,237,0.4);
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
}
.btn-success {
  background: linear-gradient(135deg, var(--success), #059669);
  color: white;
}
.btn-danger {
  background: rgba(239,68,68,0.15);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.3);
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ---- Forms ---- */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: var(--transition);
}
.form-input:focus {
  border-color: var(--border-focus);
  background: rgba(124,58,237,0.08);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}
.form-input::placeholder { color: var(--text-muted); }
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}
.form-select option { background: #1a1a2e; color: var(--text-primary); }
.form-textarea { resize: vertical; min-height: 120px; }

/* ---- Alert ---- */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.alert-error { background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.3); color: #FCA5A5; }
.alert-success { background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.3); color: #6EE7B7; }
.alert-info { background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.3); color: #67E8F9; }
.alert-warn { background: rgba(245,158,11,0.12); border: 1px solid rgba(245,158,11,0.3); color: #FCD34D; }

/* ---- Login Page ---- */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 40px;
}
.auth-logo {
  text-align: center;
  margin-bottom: 32px;
}
.auth-logo .logo-big {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-purple);
}
.auth-logo h1 { font-size: 1.4rem; font-weight: 700; }
.auth-logo p { color: var(--text-secondary); font-size: 0.85rem; margin-top: 4px; }

/* ---- Submit Page ---- */
.submit-page { padding-top: calc(var(--nav-h) + 24px); }
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-card);
}
.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--primary);
  background: rgba(124,58,237,0.08);
}
.upload-zone .upload-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.7;
}
.upload-zone p { color: var(--text-secondary); font-size: 0.9rem; }
.upload-zone .upload-hint { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }
.file-preview-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.file-preview-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
}
.file-preview-img {
  width: 48px; height: 48px;
  object-fit: cover;
  border-radius: 6px;
}

/* ---- Submissions History ---- */
.submission-card {
  padding: 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  transition: var(--transition);
}
.submission-card:hover { border-color: rgba(124,58,237,0.3); }
.submission-thumb {
  width: 72px; height: 72px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: var(--bg-card-hover);
}
.submission-info { flex: 1; min-width: 0; }
.submission-title { font-weight: 600; font-size: 0.9rem; margin-bottom: 4px; }
.submission-meta { font-size: 0.78rem; color: var(--text-muted); }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
}
.badge-pending { background: rgba(245,158,11,0.15); color: var(--accent); border: 1px solid rgba(245,158,11,0.3); }
.badge-reviewed { background: rgba(16,185,129,0.15); color: var(--success); border: 1px solid rgba(16,185,129,0.3); }

/* ---- Admin Dashboard ---- */
.admin-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--nav-h);
}
.admin-sidebar {
  width: 240px;
  flex-shrink: 0;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  bottom: 0;
  background: rgba(15,15,26,0.9);
  backdrop-filter: blur(12px);
  border-right: 1px solid var(--border);
  padding: 20px 12px;
  overflow-y: auto;
  z-index: 100;
}
.admin-main {
  flex: 1;
  margin-left: 240px;
  padding: 28px 24px;
  min-width: 0;
}
.sidebar-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0 12px;
  margin: 20px 0 8px;
}
.sidebar-label:first-child { margin-top: 0; }
.sidebar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 2px;
}
.sidebar-item:hover,
.sidebar-item.active {
  background: rgba(124,58,237,0.15);
  color: var(--primary-light);
}
.sidebar-item .icon { font-size: 1.1rem; width: 20px; text-align: center; }

/* ---- Admin Panel Sections ---- */
.admin-panel { display: none; }
.admin-panel.active { display: block; }
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}
.panel-title { font-size: 1.4rem; font-weight: 700; }
.panel-subtitle { color: var(--text-muted); font-size: 0.85rem; margin-top: 2px; }

/* ---- Content Tree ---- */
.content-tree {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tree-subject {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.tree-subject-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  transition: var(--transition);
  gap: 12px;
}
.tree-subject-header:hover { background: var(--bg-card-hover); }
.tree-subject-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
}
.tree-grades {
  display: none;
  padding: 0 16px 16px;
}
.tree-grades.open { display: block; }
.tree-grade {
  margin-top: 10px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.tree-grade-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.tree-lessons { display: none; padding: 4px 12px 12px; }
.tree-lessons.open { display: block; }
.tree-lesson {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  gap: 10px;
}
.tree-lesson:hover { background: rgba(124,58,237,0.1); color: var(--primary-light); }
.tree-lesson-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}
.tree-lesson:hover .tree-lesson-actions { opacity: 1; }

/* ---- WYSIWYG Editor ---- */
.editor-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  height: calc(100vh - 200px);
  min-height: 500px;
}
.editor-pane, .preview-pane {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.pane-header {
  padding: 12px 16px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
#wysiwyg-editor {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: white;
  color: #1a1a2e;
  font-family: 'Prompt', sans-serif;
  font-size: 0.95rem;
  line-height: 1.7;
  outline: none;
}
#wysiwyg-editor:focus { outline: none; }
#preview-frame {
  flex: 1;
  border: none;
  background: white;
}
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 8px 12px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.toolbar-btn {
  padding: 5px 8px;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  min-width: 28px;
  text-align: center;
}
.toolbar-btn:hover {
  background: rgba(124,58,237,0.2);
  color: var(--primary-light);
}
.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

/* ---- Data Table ---- */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.85rem;
}
.data-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
}
.data-table th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.data-table th:last-child { border-radius: 0 var(--radius-sm) 0 0; }
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg-card-hover); }
.table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ---- Filter Bar ---- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.filter-bar .form-input,
.filter-bar .form-select {
  flex: 1;
  min-width: 140px;
}

/* ---- Stats Cards ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  padding: 20px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.stat-value {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { color: var(--text-muted); font-size: 0.8rem; margin-top: 4px; }

/* ---- Modal ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 5000;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal {
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  animation: modalIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.modal-close {
  margin-left: auto;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  border: none;
  font-size: 1.1rem;
  transition: var(--transition);
}
.modal-close:hover { color: var(--danger); background: rgba(239,68,68,0.1); }

/* ---- Full WYSIWYG Modal ---- */
.editor-modal { max-width: 98vw; width: 100%; padding: 20px; }
.editor-modal .editor-layout { height: calc(100vh - 160px); }

/* ---- Submission Detail Image ---- */
.submission-detail-img {
  max-width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

/* ---- Notifications / Toast ---- */
#toast-container {
  position: fixed;
  top: calc(var(--nav-h) + 12px);
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(30,30,50,0.97);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
  min-width: 220px;
  max-width: 340px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastIn 0.3s ease;
  pointer-events: none;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}
.toast.success { border-color: rgba(16,185,129,0.4); }
.toast.error { border-color: rgba(239,68,68,0.4); }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }

/* ---- Page Transitions ---- */
.page-fade { animation: fadeIn 0.35s ease; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  :root { --nav-h: 56px; }

  .navbar-menu { display: none; }
  .hamburger { display: flex; }
  .mobile-sidebar { display: block; }

  .admin-sidebar { display: none; }
  .admin-main { margin-left: 0; padding: 16px; }

  .editor-layout {
    grid-template-columns: 1fr;
    height: auto;
  }
  .editor-pane { height: 320px; }
  .preview-pane { height: 300px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .panel-header { flex-direction: column; align-items: flex-start; }

  .auth-card { padding: 24px; }
  .modal { padding: 20px; }
  .filter-bar { flex-direction: column; }

  .data-table { font-size: 0.78rem; }
  .data-table td, .data-table th { padding: 10px 10px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .home-welcome { padding: 40px 16px 24px; }
}

/* ---- Admin Mobile Sidebar Toggle ---- */
.admin-mobile-toggle {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 500;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: var(--shadow-purple);
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  border: none;
  color: white;
}
@media (max-width: 768px) {
  .admin-mobile-toggle { display: flex; }
  .admin-sidebar.mobile-open {
    display: block;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    bottom: 0;
    z-index: 400;
    width: 260px;
    background: rgba(15,15,26,0.98);
  }
}

/* ---- Divider ---- */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ---- Empty State ---- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: 12px; opacity: 0.5; }
.empty-state p { font-size: 0.9rem; }

/* ---- Upload Progress ---- */
.progress-bar {
  height: 4px;
  background: var(--bg-card-hover);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
  transition: width 0.3s ease;
}