/**
 * AI分享会网站 - 组件样式
 * 版本: 1.0
 */

/* ========================================
   按钮组件
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.5;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  border: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-400));
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--primary-500);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-icon {
  padding: var(--space-2);
  border-radius: var(--radius-md);
}

/* ========================================
   卡片组件
   ======================================== */
.card {
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  border-color: var(--primary-500);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  color: var(--text-secondary);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-light);
}

/* ========================================
   导航组件
   ======================================== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-fixed);
  background: transparent;
  transition: background var(--duration-normal) var(--ease-out),
              backdrop-filter var(--duration-normal) var(--ease-out);
}

.nav-header-inner {
  position: relative;
}

.nav-header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-light);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-500), var(--accent-cyan));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-2);
  min-width: 200px;
  max-height: 320px;
  overflow-y: auto;
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--duration-fast) var(--ease-out);
  scrollbar-width: thin;
  scrollbar-color: var(--gray-600) transparent;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.active .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ========================================
   全局章节导航
   ======================================== */
.global-chapter-nav {
  position: fixed;
  right: var(--space-6);
  top: 50%;
  transform: translateY(-50%);
  z-index: calc(var(--z-fixed) - 1);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  margin: calc(var(--space-4) * -1);
}

.global-chapter-nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0;
}

.global-chapter-dots {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
}

.global-chapter-dot {
  position: relative;
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gray-600);
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
  text-decoration: none;
  overflow: visible;
  font-size: 0;
  z-index: 1;
}

.global-chapter-dot:hover {
  background: var(--primary-400);
  transform: scale(1.4);
}

.global-chapter-dot.active {
  background: var(--primary-500);
  transform: scale(1.4);
  box-shadow: 0 0 8px var(--primary-500);
}

.global-chapter-dot-label {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%) translateX(10px);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  z-index: 10;
  transition: opacity 0.15s ease, 
              visibility 0.15s ease,
              transform 0.15s ease;
  min-width: 120px;
  text-align: center;
}

.global-chapter-dot:hover .global-chapter-dot-label,
.global-chapter-dot:focus .global-chapter-dot-label {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
  transition-delay: 0s;
}

@media (max-width: 768px) {
  .global-chapter-nav {
    display: none;
  }
}

/* ========================================
   进度条
   ======================================== */
.nav-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: calc(var(--z-fixed) + 1);
}

.nav-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-cyan));
  width: 0;
  transition: width 0.1s linear;
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-dropdown-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ========================================
   进度条组件
   ======================================== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-cyan));
  transform-origin: left;
  transform: scaleX(0);
  z-index: var(--z-fixed);
  transition: transform 0.1s linear;
}

/* ========================================
   章节导航
   ======================================== */
.chapter-nav {
  position: fixed;
  right: var(--space-6);
  top: 50%;
  transform: translateY(-50%);
  z-index: var(--z-sticky);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.chapter-nav-dot {
  position: relative;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--gray-600);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.chapter-nav-dot:hover {
  background: var(--primary-400);
  border-color: var(--primary-500);
  transform: scale(1.2);
}

.chapter-nav-dot.active {
  background: var(--primary-500);
  border-color: var(--primary-400);
  box-shadow: 0 0 12px var(--primary-500);
  transform: scale(1.3);
}

.chapter-nav-label {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-card);
  border: var(--border-light);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--duration-fast) var(--ease-out);
  box-shadow: var(--shadow-lg);
}

.chapter-nav-dot:hover .chapter-nav-label {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(-4px);
}

/* ========================================
   标签组件
   ======================================== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.tag-primary {
  background: rgba(59, 130, 246, 0.2);
  color: var(--primary-400);
}

.tag-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
}

.tag-warning {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-amber);
}

.tag-danger {
  background: rgba(244, 63, 94, 0.2);
  color: var(--accent-rose);
}

/* ========================================
   代码块组件
   ======================================== */
.code-block {
  background: var(--bg-secondary);
  border: var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-tertiary);
  border-bottom: var(--border-light);
}

.code-block-lang {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
}

.code-block-copy {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: transparent;
  border: var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.code-block-copy:hover {
  color: var(--text-primary);
  border-color: var(--primary-500);
}

.code-block pre {
  padding: var(--space-4);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: 1.6;
}

.code-block code {
  color: var(--text-secondary);
}

/* ========================================
   表格组件
   ======================================== */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: var(--border-light);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: var(--border-light);
}

.table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.table tr:hover td {
  background: var(--bg-secondary);
}

.table-striped tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* ========================================
   演示卡片组件
   ======================================== */
.demo-card {
  background: var(--bg-card);
  border: var(--border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.demo-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--bg-secondary);
  border-bottom: var(--border-light);
}

.demo-card-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.demo-card-help {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-muted);
  font-size: var(--text-sm);
  cursor: help;
  transition: all var(--duration-fast) var(--ease-out);
}

.demo-card-help:hover {
  background: var(--primary-500);
  color: white;
}

.demo-card-visualization {
  padding: var(--space-4) var(--space-6);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-card-controls {
  padding: var(--space-3) var(--space-6);
  background: var(--bg-secondary);
  border-top: var(--border-light);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.demo-card-description {
  padding: var(--space-3) var(--space-6);
  background: var(--bg-primary);
  border-top: var(--border-light);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* ========================================
   时间线组件
   ======================================== */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary-500), var(--accent-cyan));
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  border: 2px solid var(--primary-500);
  transition: all var(--duration-fast) var(--ease-out);
}

.timeline-item:hover::before {
  background: var(--primary-500);
  box-shadow: 0 0 10px var(--primary-500);
}

.timeline-date {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--primary-400);
  margin-bottom: var(--space-1);
}

.timeline-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.timeline-content {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* ========================================
   提示框组件
   ======================================== */
.tooltip {
  position: relative;
}

.tooltip-content {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-2) var(--space-3);
  background: var(--bg-tertiary);
  border: var(--border-light);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease-out);
  z-index: var(--z-tooltip);
}

.tooltip:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-8px);
}

/* ========================================
   警告框组件
   ======================================== */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-light);
}

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
}

.alert-danger {
  background: rgba(244, 63, 94, 0.1);
  border-color: rgba(244, 63, 94, 0.3);
}

/* ========================================
   加载动画
   ======================================== */
.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--gray-600);
  border-top-color: var(--primary-500);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

.loading-dots {
  display: flex;
  gap: var(--space-1);
}

.loading-dots span {
  width: 8px;
  height: 8px;
  background: var(--primary-500);
  border-radius: var(--radius-full);
  animation: bounce 1.4s ease-in-out infinite both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* ========================================
   分隔线
   ======================================== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-700), transparent);
  margin: var(--space-8) 0;
}

.divider-vertical {
  width: 1px;
  height: 100%;
  background: var(--gray-700);
}

/* ========================================
   徽章
   ======================================== */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--primary-500);
  color: white;
}

/* ========================================
   移动端菜单
   ======================================== */
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-out);
}

.nav-mobile-toggle:hover {
  background: var(--bg-secondary);
}

.nav-mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 85%;
  max-width: 300px;
  height: 100vh;
  height: 100dvh;
  background: var(--bg-card);
  z-index: 1000;
  transition: right 0.3s ease;
  overflow-y: auto;
  border-left: var(--border-light);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
}

.nav-mobile-menu.open {
  right: 0;
}

.nav-mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.nav-mobile-overlay.open {
  opacity: 1;
  visibility: visible;
}

.nav-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-light);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 1;
}

.nav-mobile-title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.nav-mobile-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-mobile-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-mobile-list {
  padding: var(--space-2);
}

.nav-mobile-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.nav-mobile-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.nav-mobile-item.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary-400);
}

.nav-mobile-item i {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

@media (max-width: 1023px) {
  .nav-mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu .nav-dropdown,
  .nav-menu > .nav-link:not(#theme-toggle) {
    display: none;
  }
}

@media (min-width: 1024px) {
  .nav-mobile-menu,
  .nav-mobile-overlay {
    display: none !important;
  }
}