/* ═══════════════════════════════════════════
   艾库智能体工坊 — Aiku AI Agent Workshop
   样式系统
   ═══════════════════════════════════════════ */

/* ── CSS 变量 ── */
:root {
  /* 主色调 — 淡紫到淡蓝渐变 */
  --primary-50: #f5f0ff;
  --primary-100: #ede5ff;
  --primary-200: #d4c4ff;
  --primary-300: #b39dff;
  --primary-400: #8b6eff;
  --primary-500: #6c4ff0;
  --primary-600: #5a3fd6;
  --primary-700: #4a33b3;

  /* 辅助色 — 青蓝 */
  --accent-50: #ecfdf5;
  --accent-100: #d1fae5;
  --accent-200: #a7f3d0;
  --accent-400: #34d399;
  --accent-500: #10b981;
  --accent-600: #059669;

  /* 暖色点缀 */
  --warm-50: #fff7ed;
  --warm-100: #ffedd5;
  --warm-400: #fb923c;
  --warm-500: #f97316;

  /* 中性色 — 暖调灰 */
  --gray-50: #faf9f7;
  --gray-100: #f0eee9;
  --gray-200: #e2dfd8;
  --gray-300: #c4bfb6;
  --gray-400: #9e9990;
  --gray-500: #7a756d;
  --gray-600: #5c5851;
  --gray-700: #3d3a36;
  --gray-800: #262522;
  --gray-900: #171614;

  /* 语义色 */
  --white: #ffffff;
  --red-50: #fef2f2;
  --red-500: #ef4444;
  --red-600: #dc2626;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.03);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.07), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.08);
  --shadow-ring: 0 0 0 1px rgba(0,0,0,0.05);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* 字体 */
  --font-sans: 'Inter', -apple-system, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* 过渡 */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  /* 布局 */
  --max-width: 1200px;
  --nav-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary-500); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-700); }

/* ── 导航栏 ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 18px;
  color: var(--gray-900);
  letter-spacing: -0.3px;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-400), var(--primary-500));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-500);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: none;
  font-family: var(--font-sans);
}

.nav-link:hover {
  color: var(--gray-700);
  background: rgba(0,0,0,0.04);
}

.nav-link.active {
  color: var(--primary-500);
  background: var(--primary-50);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── 按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-sans);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  box-shadow: 0 1px 3px rgba(108,79,240,0.2);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108,79,240,0.3);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: var(--gray-500);
}

.btn-ghost:hover {
  background: rgba(0,0,0,0.04);
  color: var(--gray-700);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 13px;
}

/* ── 主体布局 ── */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 60px;
}

/* ── Tab 导航 ── */
.tab-bar {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-ring), var(--shadow-sm);
  margin-bottom: 32px;
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  min-width: 120px;
  padding: 12px 20px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-400);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--gray-600);
  background: var(--gray-50);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary-50), var(--accent-50));
  color: var(--primary-600);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.tab-btn .tab-icon {
  margin-right: 6px;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ��─ 页面头部 ── */
.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--gray-800);
  letter-spacing: -0.3px;
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--gray-400);
}

/* ── 卡片网格 ── */
.card-grid {
  display: grid;
  gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ── 卡片 ── */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-ring), var(--shadow-sm);
  transition: var(--transition);
  cursor: default;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-clickable { cursor: pointer; }

.card-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.badge-purple { background: var(--primary-50); color: var(--primary-500); }
.badge-green { background: var(--accent-50); color: var(--accent-600); }
.badge-warm { background: var(--warm-50); color: var(--warm-500); }
.badge-gray { background: var(--gray-100); color: var(--gray-500); }

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 12px;
}

.icon-purple { background: var(--primary-50); }
.icon-green { background: var(--accent-50); }
.icon-warm { background: var(--warm-50); }
.icon-gray { background: var(--gray-100); }

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 6px;
  letter-spacing: -0.2px;
}

.card-desc {
  font-size: 13px;
  color: var(--gray-400);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
  font-size: 12px;
  color: var(--gray-400);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── 资讯列表 ── */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.news-item {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-ring);
  transition: var(--transition);
  cursor: pointer;
}

.news-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(3px);
}

.news-item-index {
  width: 28px;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-300);
  flex-shrink: 0;
  line-height: 1.4;
}

.news-content { flex: 1; min-width: 0; }

.news-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-800);
  margin-bottom: 2px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-desc {
  font-size: 13px;
  color: var(--gray-400);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--gray-400);
}

.news-tag {
  padding: 1px 7px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
}

.news-tag-hot { background: var(--red-50); color: var(--red-500); }
.news-tag-new { background: var(--accent-50); color: var(--accent-600); }
.news-tag-trend { background: var(--primary-50); color: var(--primary-500); }

.news-source { color: var(--gray-300); }

/* ── 社区帖子 ── */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.post-item {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-ring);
  transition: var(--transition);
  cursor: pointer;
}

.post-item:hover {
  box-shadow: var(--shadow-md);
}

.post-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
  color: white;
}

.post-body { flex: 1; min-width: 0; }

.post-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.post-author {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

.post-time {
  font-size: 12px;
  color: var(--gray-300);
}

.post-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.post-excerpt {
  font-size: 13px;
  color: var(--gray-400);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-stats {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--gray-400);
}

.post-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── 注册登录 Modal ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(23,22,20,0.4);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 36px 32px 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.25s cubic-bezier(0.4,0,0.2,1);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  float: right;
  border: none;
  background: none;
  font-size: 20px;
  color: var(--gray-300);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

.modal-close:hover { color: var(--gray-500); }

.modal-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 4px;
  letter-spacing: -0.3px;
}

.modal-subtitle {
  font-size: 13px;
  color: var(--gray-400);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-600);
  margin-bottom: 4px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--white);
  transition: var(--transition);
  outline: none;
}

.form-input:focus {
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3px rgba(108,79,240,0.1);
}

.form-input::placeholder { color: var(--gray-300); }

.form-submit {
  width: 100%;
  padding: 11px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  margin-top: 4px;
}

.form-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108,79,240,0.3);
}

.form-footer {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--gray-400);
}

.form-footer a {
  color: var(--primary-500);
  cursor: pointer;
  font-weight: 500;
}

.form-error {
  color: var(--red-500);
  font-size: 13px;
  margin-bottom: 12px;
  display: none;
}

.form-error.show { display: block; }

.form-switch {
  text-align: center;
  margin-top: 4px;
}

.form-switch button {
  background: none;
  border: none;
  color: var(--primary-500);
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
  font-family: var(--font-sans);
}
.form-switch button:hover { color: var(--primary-700); }

/* ── 用户状态 ── */
.user-avatar-small {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.user-avatar-small:hover { opacity: 0.85; }

.user-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  padding: 4px;
  z-index: 150;
}

.user-menu.open { display: block; }

.user-menu-item {
  display: block;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: none;
  font-size: 13px;
  color: var(--gray-600);
  cursor: pointer;
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: var(--font-sans);
  transition: var(--transition);
}

.user-menu-item:hover { background: var(--gray-50); color: var(--gray-800); }

.user-menu-divider {
  height: 1px;
  background: var(--gray-100);
  margin: 4px 0;
}

.user-menu-item.logout { color: var(--red-500); }
.user-menu-item.logout:hover { background: var(--red-50); }

/* ── 用户头像容器（用于下拉菜单位置） ── */
.user-container { position: relative; }

/* ── 用户欢迎横幅 ── */
.welcome-banner {
  background: linear-gradient(135deg, var(--primary-50), var(--accent-50));
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.welcome-banner h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.welcome-banner p {
  font-size: 14px;
  color: var(--gray-500);
}

.welcome-banner .welcome-user {
  color: var(--primary-500);
  font-weight: 600;
}

/* ── 响应式 ── */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .main { padding: 16px 16px 40px; }
  .tab-bar { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab-btn { min-width: 100px; padding: 10px 14px; font-size: 13px; }
  .welcome-banner { padding: 16px 20px; }
  .modal { margin: 16px; padding: 24px 20px; }
  .news-item, .post-item { padding: 12px 16px; }
}