/* ============================================
   CATATAN WALI KELAS AI - Design System
   Premium Glassmorphism Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2035;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);
  --bg-input: rgba(255, 255, 255, 0.05);
  --bg-input-focus: rgba(255, 255, 255, 0.08);

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(99, 102, 241, 0.5);
  --border-accent: rgba(139, 92, 246, 0.3);

  /* Text */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #a78bfa;
  --text-on-accent: #ffffff;

  /* Accent Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
  --gradient-secondary: linear-gradient(135deg, #3b82f6, #6366f1);
  --gradient-success: linear-gradient(135deg, #10b981, #34d399);
  --gradient-danger: linear-gradient(135deg, #ef4444, #f87171);
  --gradient-warning: linear-gradient(135deg, #f59e0b, #fbbf24);
  --gradient-info: linear-gradient(135deg, #06b6d4, #22d3ee);
  --gradient-bg: linear-gradient(135deg, #0a0e1a 0%, #111827 50%, #0f172a 100%);
  --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.02));
  --gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 60%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
  --shadow-glow-lg: 0 0 40px rgba(99, 102, 241, 0.2);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset & Base ── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--gradient-bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Glow Effects */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, 1%) rotate(1deg); }
  50% { transform: translate(-1%, 2%) rotate(-1deg); }
  75% { transform: translate(1%, -1%) rotate(0.5deg); }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: rgba(99, 102, 241, 0.5); }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p { color: var(--text-secondary); }

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: #c4b5fd; }

/* ── Layout ── */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-lg);
  min-height: 100vh;
}

.app-container.admin-container {
  max-width: 900px;
}

/* ── Header ── */
.app-header {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  position: relative;
}

.app-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.app-logo-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  box-shadow: var(--shadow-glow);
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.app-title {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 400;
  max-width: 500px;
  margin: 0 auto;
}

.admin-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(239, 68, 68, 0.2);
  margin-top: var(--space-sm);
}

/* ── Glass Card ── */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.glass-card:hover {
  border-color: var(--border-default);
  box-shadow: var(--shadow-xl);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.card-header-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.card-header-text h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.card-header-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Forms ── */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.01em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder { color: var(--text-muted); }

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.input-with-icon {
  position: relative;
}

.input-with-icon .form-input {
  padding-right: 3rem;
}

.input-icon-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: 1rem;
}

.input-icon-btn:hover {
  color: var(--text-accent);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0);
  transition: background var(--transition-fast);
}

.btn:hover::after { background: rgba(255, 255, 255, 0.1); }
.btn:active { transform: scale(0.97); }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}
.btn:disabled::after { display: none; }

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-on-accent);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4); }

.btn-success {
  background: var(--gradient-success);
  color: var(--text-on-accent);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-danger {
  background: var(--gradient-danger);
  color: var(--text-on-accent);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-warning {
  background: var(--gradient-warning);
  color: #1a1a2e;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.btn-ghost:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ── Step Indicator ── */
.step-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: var(--space-2xl);
  padding: 0 var(--space-md);
}

.step-item {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: all var(--transition-base);
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--bg-glass);
  border: 2px solid var(--border-subtle);
  color: var(--text-muted);
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.step-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-base);
}

.step-line {
  width: 60px;
  height: 2px;
  background: var(--border-subtle);
  margin: 0 var(--space-sm);
  transition: background var(--transition-base);
  flex-shrink: 0;
}

.step-item.active .step-number {
  background: var(--gradient-primary);
  border-color: transparent;
  color: white;
  box-shadow: var(--shadow-glow);
}

.step-item.active .step-label { color: var(--text-primary); }

.step-item.completed .step-number {
  background: var(--gradient-success);
  border-color: transparent;
  color: white;
}

.step-item.completed .step-label { color: var(--text-secondary); }

.step-line.active { background: var(--gradient-primary); }

/* ── Step Content ── */
.step-content {
  display: none;
  animation: fadeSlideIn 0.4s ease-out;
}

.step-content.active { display: block; }

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Upload Zone ── */
.upload-zone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--bg-glass);
  position: relative;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: rgba(99, 102, 241, 0.5);
  background: rgba(99, 102, 241, 0.05);
}

.upload-zone-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  opacity: 0.6;
}

.upload-zone-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.upload-zone-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 10;
}

/* ── Data Table ── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  margin-top: var(--space-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table thead {
  background: rgba(99, 102, 241, 0.1);
}

.data-table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.data-table td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--bg-glass-hover);
}

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

.data-table input {
  background: var(--bg-input);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 6px 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  width: 100%;
  min-width: 80px;
  transition: all var(--transition-fast);
}

.data-table input:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  outline: none;
}

/* ── API Key List (Admin) ── */
.api-key-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  transition: all var(--transition-base);
}

.api-key-item:hover {
  border-color: var(--border-default);
  background: var(--bg-glass-hover);
}

.api-key-number {
  width: 28px;
  height: 28px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.api-key-value {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  word-break: break-all;
}

.api-key-value.masked {
  color: var(--text-muted);
  letter-spacing: 2px;
}

.api-key-status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.api-key-status.active {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.api-key-status.inactive {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.api-key-status.error {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.api-key-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* ── Toggle Switch ── */
.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: all var(--transition-base);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--gradient-success);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* ── Result Cards ── */
.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: all var(--transition-base);
}

.result-card:hover {
  border-color: var(--border-accent);
}

.result-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.student-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.student-nis {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.result-content {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

.result-content strong {
  color: var(--text-primary);
}

/* ── Alerts / Toasts ── */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  margin-bottom: var(--space-md);
  border: 1px solid;
  animation: fadeSlideIn 0.3s ease-out;
}

.alert-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}

.alert-info {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.2);
  color: #a78bfa;
}

/* ── Toast Notification ── */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(20px);
  font-size: 0.85rem;
  color: var(--text-primary);
  min-width: 280px;
  max-width: 400px;
  animation: toastIn 0.4s var(--transition-bounce);
}

.toast.removing { animation: toastOut 0.3s ease-in forwards; }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100px) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateX(100px) scale(0.9); }
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal-header h3 {
  font-size: 1.15rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition-fast);
}
.modal-close:hover { color: var(--text-primary); }

/* ── Loading Spinner ── */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: #a78bfa;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 16px; height: 16px; border-width: 2px; }
.spinner-lg { width: 40px; height: 40px; border-width: 4px; }

@keyframes spin { to { transform: rotate(360deg); } }

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  z-index: 99999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.loading-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.loading-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* AI Progress */
.ai-progress {
  width: 100%;
  max-width: 400px;
}

.ai-progress-bar {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.ai-progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s ease-out;
  position: relative;
}

.ai-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.ai-progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* ── Login Page ── */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  position: relative;
  z-index: 1;
}

.login-card {
  width: 100%;
  max-width: 420px;
}

.login-card .glass-card {
  padding: var(--space-2xl);
}

/* ── Stats Cards (Admin Dashboard) ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.stat-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  opacity: 0.4;
  margin-bottom: var(--space-md);
}

.empty-state-text {
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

/* ── Navigation ── */
.nav-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

/* ── Chip / Tag ── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(99, 102, 241, 0.1);
  color: var(--text-accent);
  border: 1px solid rgba(99, 102, 241, 0.15);
}

/* ── Footer ── */
.app-footer {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.app-footer a {
  color: var(--text-accent);
}

/* ── Admin Link (from main page) ── */
.admin-link {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 100;
}

.admin-link a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.admin-link a:hover {
  border-color: var(--border-default);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

/* ── Back to App Link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast);
}

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

/* ── Jenjang Cards ── */
.jenjang-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.jenjang-card {
  background: var(--bg-glass);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.jenjang-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-glass-hover);
  transform: translateY(-2px);
}

.jenjang-card.selected {
  border-color: rgba(99, 102, 241, 0.6);
  background: rgba(99, 102, 241, 0.08);
  box-shadow: var(--shadow-glow);
}

.jenjang-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.jenjang-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.jenjang-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Tab Indicator for Manual/Upload ── */
.tab-group {
  display: flex;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  padding: 4px;
  border: 1px solid var(--border-subtle);
  margin-bottom: var(--space-lg);
}

.tab-btn {
  flex: 1;
  padding: 0.6rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
}

.tab-btn.active {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeSlideIn 0.3s ease-out;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .app-container { padding: var(--space-md); }
  
  h1 { font-size: 1.5rem; }
  
  .step-indicator { flex-wrap: wrap; gap: var(--space-sm); }
  .step-line { width: 30px; }
  .step-label { display: none; }
  
  .form-row { grid-template-columns: 1fr; }
  .jenjang-grid { grid-template-columns: 1fr; }
  
  .glass-card { padding: var(--space-lg); }
  
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  
  .api-key-item { flex-wrap: wrap; }
  .api-key-value { min-width: 100%; order: 3; }
  
  .toast-container {
    left: var(--space-md);
    right: var(--space-md);
    top: var(--space-md);
  }
  
  .toast { min-width: auto; }
  
  .nav-actions {
    flex-direction: column;
    gap: var(--space-md);
  }
  .nav-actions .btn { width: 100%; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .app-logo-icon { width: 44px; height: 44px; font-size: 1.3rem; }
  .app-title { font-size: 1.35rem; }
}

/* ── Print Styles ── */
@media print {
  body { background: white; color: black; }
  body::before { display: none; }
  .app-header, .step-indicator, .nav-actions, .admin-link, .btn-group { display: none; }
  .glass-card { background: white; border: 1px solid #ddd; box-shadow: none; backdrop-filter: none; }
  .result-card { break-inside: avoid; page-break-inside: avoid; }
  .result-content { color: #333; }
  .student-name { color: black; }
}

/* ── Pulse Animation for AI Processing ── */
.ai-pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ── Skeleton Loading ── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-glass) 25%, var(--bg-glass-hover) 50%, var(--bg-glass) 75%);
  background-size: 200% 100%;
  animation: skeletonShimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeletonShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line {
  height: 16px;
  margin-bottom: var(--space-sm);
  border-radius: var(--radius-sm);
}

.skeleton-line:last-child { width: 60%; }

/* ── Password Strength ── */
.password-strength {
  display: flex;
  gap: 4px;
  margin-top: var(--space-sm);
}

.password-strength-bar {
  flex: 1;
  height: 3px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  transition: background var(--transition-base);
}

.password-strength-bar.weak { background: #ef4444; }
.password-strength-bar.medium { background: #f59e0b; }
.password-strength-bar.strong { background: #10b981; }