/* ========================================
   K12Media 試卷查看器 - 樣式表
   Modern dark theme with glassmorphism
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);

  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;

  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);

  /* Subject colors */
  --subject-1: #ef4444;
  /* 語文 - Red */
  --subject-2: #3b82f6;
  /* 數學 - Blue */
  --subject-3: #10b981;
  /* 英語 - Green */
  --subject-4: #f59e0b;
  /* 物理 - Orange */
  --subject-5: #8b5cf6;
  /* 化學 - Purple */
  --subject-6: #14b8a6;
  /* 生物 - Teal */
  --subject-7: #ec4899;
  /* 政治 - Pink */
  --subject-8: #f97316;
  /* 歷史 - Amber */
  --subject-9: #06b6d4;
  /* 地理 - Cyan */

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

  /* Border radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Background gradient animation */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* App Container */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md);
}

/* Glass Card Effect */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glow);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.1);
}

/* Header */
.header {
  padding: var(--space-lg) 0;
  margin-bottom: var(--space-lg);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-icon {
  font-size: 1.8rem;
  -webkit-text-fill-color: initial;
}

/* Connection Status */
.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--error);
  animation: pulse 2s infinite;
}

.connection-status.connected .status-dot {
  background: var(--success);
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

/* Section Titles */
.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
}

/* Auth Section */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Auth Tabs */
.auth-tabs {
  display: flex;
  margin-bottom: var(--space-md);
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-md);
}

.auth-tab {
  flex: 1;
  padding: var(--space-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.auth-tab.active {
  background: var(--bg-primary);
  color: white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Form Inputs */
.input-group {
  margin-bottom: var(--space-md);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.full-width {
  width: 100%;
  justify-content: center;
}

.form-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: var(--space-md);
}

.cookie-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 0.875rem;
  resize: vertical;
  transition: all var(--transition-fast);
}

.cookie-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.auth-help {
  margin-top: var(--space-md);
}

.auth-help details {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.auth-help summary {
  cursor: pointer;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
}

.auth-help ol {
  margin-left: var(--space-lg);
  margin-top: var(--space-sm);
}

.auth-help li {
  margin-bottom: var(--space-xs);
}

.auth-help a {
  color: var(--accent-secondary);
  text-decoration: none;
}

.auth-help a:hover {
  text-decoration: underline;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-icon {
  font-size: 1.1em;
}

/* Search Section */
.search-form {
  margin-bottom: var(--space-md);
}

.search-input-group {
  display: flex;
  gap: var(--space-md);
}

.search-input {
  flex: 1;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.exam-select {
  flex: 1;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
}

.exam-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.search-result {
  padding: var(--space-md);
  min-height: 60px;
}

.search-result.error {
  color: var(--error);
}

.search-result.loading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-secondary);
}

/* Student Info */
.student-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.student-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
}

.student-details h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.student-details p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Subject Tabs */
.subject-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: white;
}

/* Subject-specific colors when active */
.tab-btn[data-subject="1"].active {
  background: var(--subject-1);
}

.tab-btn[data-subject="2"].active {
  background: var(--subject-2);
}

.tab-btn[data-subject="3"].active {
  background: var(--subject-3);
}

.tab-btn[data-subject="4"].active {
  background: var(--subject-4);
}

.tab-btn[data-subject="5"].active {
  background: var(--subject-5);
}

.tab-btn[data-subject="6"].active {
  background: var(--subject-6);
}

.tab-btn[data-subject="7"].active {
  background: var(--subject-7);
}

.tab-btn[data-subject="8"].active {
  background: var(--subject-8);
}

.tab-btn[data-subject="9"].active {
  background: var(--subject-9);
}

/* Images Container */
.images-container {
  min-height: 300px;
}

.images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.image-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.image-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.image-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.image-card-info {
  padding: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.image-card-subject {
  font-size: 0.75rem;
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--accent-primary);
  color: white;
}

.image-card-page {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Subject group in grid */
.subject-group {
  margin-bottom: var(--space-xl);
}

.subject-group-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--border-color);
}

.subject-badge {
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  color: white;
}

.subject-badge[data-subject="1"] {
  background: var(--subject-1);
}

.subject-badge[data-subject="2"] {
  background: var(--subject-2);
}

.subject-badge[data-subject="3"] {
  background: var(--subject-3);
}

.subject-badge[data-subject="4"] {
  background: var(--subject-4);
}

.subject-badge[data-subject="5"] {
  background: var(--subject-5);
}

.subject-badge[data-subject="6"] {
  background: var(--subject-6);
}

.subject-badge[data-subject="7"] {
  background: var(--subject-7);
}

.subject-badge[data-subject="8"] {
  background: var(--subject-8);
}

.subject-badge[data-subject="9"] {
  background: var(--subject-9);
}

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  color: var(--text-secondary);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-md);
}

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

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

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* AI Features Section */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.ai-feature {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.ai-feature.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.feature-icon {
  font-size: 1.5rem;
}

.feature-name {
  flex: 1;
  font-weight: 500;
}

.feature-badge {
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--warning);
  color: #000;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 48px;
  height: 48px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-close:hover {
  background: var(--error);
  border-color: var(--error);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 80px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-nav:hover {
  background: var(--bg-glass-hover);
}

.lightbox-prev {
  left: var(--space-lg);
}

.lightbox-next {
  right: var(--space-lg);
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.lightbox-info {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: slideIn var(--transition-normal) ease;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--error);
}

.toast.warning {
  border-color: var(--warning);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .app-container {
    padding: var(--space-sm);
  }

  .glass-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .search-input-group {
    flex-direction: column;
  }

  .subject-tabs {
    justify-content: center;
  }

  .images-grid {
    grid-template-columns: 1fr;
  }

  .lightbox-nav {
    display: none;
  }
}