/**
 * SwarmLabs Shared CSS — 统一设计系统
 * 所有页面共享的设计语言，消除3套不兼容设计系统的问题
 */

:root {
  /* 主色调：深空蓝 + 科技橙 + 青色强调 */
  --bg: #0a0e1a;
  --bg2: #111827;
  --card: #1a2035;
  --border: #2a3450;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent2: #8b5cf6;
  --accent3: #06b6d4;
  --green: #10b981;
  --orange: #f59e0b;
  --red: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -1px rgba(0,0,0,0.2);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ===== 统一导航栏 ===== */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.nav-logo {
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-logo span {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
  list-style: none;
}
.nav-links a {
  padding: 6px 14px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: rgba(59, 130, 246, 0.1);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
}

/* ===== 通用组件 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #2563eb; transform: translateY(-1px); }
.btn-primary:disabled { background: var(--muted); cursor: not-allowed; transform: none; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

input, select, textarea {
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition);
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ===== Toast通知（替代alert） ===== */
.toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
  max-width: 360px;
}
.toast.success { background: rgba(16, 185, 129, 0.15); border: 1px solid var(--green); color: var(--green); }
.toast.error { background: rgba(239, 68, 68, 0.15); border: 1px solid var(--red); color: var(--red); }
.toast.warning { background: rgba(245, 158, 11, 0.15); border: 1px solid var(--orange); color: var(--orange); }
.toast.info { background: rgba(59, 130, 246, 0.15); border: 1px solid var(--accent); color: var(--accent); }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ===== 加载动画 ===== */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 数据表格 ===== */
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { text-align: left; padding: 10px 12px; font-size: 11px; color: var(--muted); border-bottom: 1px solid var(--border); text-transform: uppercase; letter-spacing: 0.05em; }
.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.data-table tr:hover td { background: rgba(255,255,255,0.03); }

/* ===== 预设模板按钮 ===== */
.preset-bar { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.preset-btn {
  padding: 5px 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 14px; font-size: 11px; color: var(--muted); cursor: pointer;
  transition: var(--transition);
}
.preset-btn:hover { border-color: var(--accent); color: var(--text); }
.preset-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== 主动学习建议卡片 ===== */
.suggest-card {
  background: linear-gradient(135deg, rgba(139,92,246,0.08), rgba(59,130,246,0.05));
  border: 1px solid rgba(139,92,246,0.3);
  border-radius: var(--radius-sm);
  padding: 14px; margin-bottom: 10px; cursor: pointer;
  transition: var(--transition);
}
.suggest-card:hover { border-color: var(--accent2); transform: translateX(4px); }
.suggest-card .s-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.suggest-card .s-title { font-size: 13px; font-weight: 600; color: var(--accent2); }
.suggest-card .s-ei { font-size: 11px; color: var(--green); font-weight: 600; }
.suggest-card .s-params { font-size: 12px; color: var(--muted); }
.suggest-card .s-info { font-size: 11px; color: var(--accent3); margin-top: 4px; }

/* ===== 不确定性分解展示 ===== */
.uq-bar {
  display: flex; height: 8px; border-radius: 4px; overflow: hidden;
  background: var(--bg); margin: 4px 0;
}
.uq-bar .epistemic { background: var(--accent2); }
.uq-bar .aleatoric { background: var(--accent3); }
.uq-legend { display: flex; gap: 12px; font-size: 11px; color: var(--muted); margin-top: 4px; }
.uq-legend .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }

/* ===== 项目卡片 ===== */
.project-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; cursor: pointer;
  transition: var(--transition); margin-bottom: 12px;
}
.project-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.project-card .p-header { display: flex; justify-content: space-between; align-items: start; margin-bottom: 8px; }
.project-card .p-title { font-size: 15px; font-weight: 600; }
.project-card .p-meta { font-size: 12px; color: var(--muted); }
.project-card .p-stats { display: flex; gap: 12px; margin-top: 8px; }
.project-card .p-stat { font-size: 12px; }
.project-card .p-stat b { color: var(--accent); }

/* ===== 对比表格高亮 ===== */
.compare-table .best-cell { background: rgba(16,185,129,0.15); color: var(--green); font-weight: 700; }

/* ===== Modal对话框 ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: none; align-items: center; justify-content: center; z-index: 200;
  backdrop-filter: blur(4px);
}
.modal-overlay.show { display: flex; }
.modal-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; max-width: 480px; width: 90%;
  max-height: 80vh; overflow-y: auto;
}
.modal-box h3 { font-size: 17px; margin-bottom: 14px; color: var(--accent); }
.modal-box .modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }

/* ===== 标签输入 ===== */
.tag-input { display: flex; flex-wrap: wrap; gap: 4px; padding: 6px; min-height: 40px; }
.tag-item { background: var(--bg); border: 1px solid var(--border); border-radius: 4px; padding: 2px 8px; font-size: 12px; color: var(--muted); }
.tag-item .remove { cursor: pointer; color: var(--red); margin-left: 4px; }

/* ===== 格式选择器 ===== */
.format-selector { display: flex; gap: 4px; margin-bottom: 12px; }
.format-tab {
  padding: 5px 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; font-size: 12px; color: var(--muted); cursor: pointer;
  transition: var(--transition);
}
.format-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== 进度条 ===== */
.progress-container { margin: 16px 0; }
.progress-bar { width: 100%; height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 4px; transition: width 0.3s ease; }
.progress-text { font-size: 12px; color: var(--muted); margin-top: 6px; text-align: center; }

/* ===== 步骤提示 ===== */
.step-hint {
  background: rgba(59,130,246,0.06); border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius-sm); padding: 10px 14px; margin-bottom: 14px;
  font-size: 13px; color: var(--muted); display: flex; align-items: start; gap: 8px;
}
.step-hint .hint-icon { font-size: 16px; flex-shrink: 0; }
.step-context {
  font-size: 12px; color: var(--muted); padding: 6px 12px;
  background: var(--bg); border-radius: var(--radius-sm); margin-bottom: 12px;
  border-left: 3px solid var(--accent3);
}

/* ===== 新手引导 Overlay ===== */
.onboarding-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 300;
  display: none; align-items: center; justify-content: center;
  backdrop-filter: blur(6px);
}
.onboarding-overlay.show { display: flex; }
.onboarding-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; max-width: 480px; width: 90%;
  text-align: center;
}
.onboarding-box .ob-step { font-size: 12px; color: var(--accent); font-weight: 600; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.onboarding-box .ob-icon { font-size: 48px; margin-bottom: 16px; }
.onboarding-box h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.onboarding-box p { color: var(--muted); font-size: 14px; line-height: 1.6; margin-bottom: 20px; }
.onboarding-box .ob-dots { display: flex; gap: 6px; justify-content: center; margin-bottom: 20px; }
.onboarding-box .ob-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.onboarding-box .ob-dot.active { background: var(--accent); }
.onboarding-box .ob-actions { display: flex; gap: 8px; justify-content: center; }

/* ===== 空状态 ===== */
.empty-state { text-align: center; padding: 40px 20px; }
.empty-state .es-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }
.empty-state .es-title { font-size: 15px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.empty-state .es-desc { font-size: 13px; color: var(--muted); margin-bottom: 16px; }

/* ===== Beta 标签 ===== */
.beta-badge {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
  background: rgba(245,158,11,0.15); color: var(--orange); border: 1px solid rgba(245,158,11,0.3);
  vertical-align: middle; margin-left: 8px;
}

/* ===== 导出下拉菜单 ===== */
.export-dropdown { position: relative; display: inline-block; }
.export-menu {
  display: none; position: absolute; top: 100%; right: 0; margin-top: 4px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow); min-width: 160px; z-index: 50; overflow: hidden;
}
.export-menu.show { display: block; }
.export-menu button {
  display: block; width: 100%; text-align: left; padding: 10px 16px;
  background: none; border: none; color: var(--text); font-size: 13px;
  cursor: pointer; transition: var(--transition);
}
.export-menu button:hover { background: rgba(59,130,246,0.1); color: var(--accent); }

/* ===== 危险按钮变体 ===== */
.btn-danger { background: transparent; color: var(--orange); border: 1px solid rgba(245,158,11,0.3); }
.btn-danger:hover { background: rgba(245,158,11,0.1); border-color: var(--orange); }

/* ===== 记住我复选框 ===== */
.remember-me { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.remember-me input { width: auto; }
.remember-me label { font-size: 13px; color: var(--muted); cursor: pointer; margin: 0; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 56px; left: 0; right: 0; flex-direction: column; background: var(--bg2); border-bottom: 1px solid var(--border); padding: 12px; gap: 4px; }
  .nav-links.show { display: flex; }
  .nav-links a { padding: 10px 14px; width: 100%; }
  .toast-container { right: 12px; left: 12px; }
  .toast { max-width: none; }
}