/* ============ 全局重置 ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --danger: #f85149;
  --warning: #d29922;
  --radius: 8px;
  --sidebar-width: 220px;
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: 14px; }

/* ============ 滚动条 ============ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ============ 登录页 ============ */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
}

.login-card {
  width: 380px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px;
}

.login-header { text-align: center; margin-bottom: 32px; }

.login-logo {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, #58a6ff, #3fb950);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 700;
  color: #fff;
}

.login-header h1 { font-size: 20px; font-weight: 600; }
.login-header p { color: var(--text-secondary); font-size: 13px; margin-top: 4px; }

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

.login-form input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}

.login-form input:focus { border-color: var(--accent); }

.btn-login {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-login:hover { background: var(--accent-hover); }

.login-error { color: var(--danger); font-size: 13px; margin-top: 12px; text-align: center; min-height: 18px; }

/* ============ 主布局 ============ */
.main-app { display: flex; height: 100vh; overflow: hidden; }

/* ============ 侧边栏 ============ */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #58a6ff, #3fb950);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 16px;
}

.sidebar-title { font-weight: 600; font-size: 15px; }

.sidebar-nav { flex: 1; padding: 8px; overflow-y: auto; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 2px;
  transition: all 0.15s;
}

.nav-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.nav-item.active { background: var(--bg-tertiary); color: var(--accent); }

.nav-item svg { flex-shrink: 0; }

.sidebar-footer { padding: 12px; border-top: 1px solid var(--border-color); }

.logout-btn {
  width: 100%;
  padding: 8px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13px;
  transition: all 0.15s;
}

.logout-btn:hover { background: rgba(248,81,73,0.1); color: var(--danger); }

/* ============ 内容区 ============ */
.content-area { flex: 1; overflow-y: auto; padding: 24px 32px; }

.page { max-width: 1200px; margin: 0 auto; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-header h2 { font-size: 20px; font-weight: 600; }

/* ============ 按钮 ============ */
.btn-primary {
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  padding: 8px 16px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 13px;
  transition: all 0.2s;
}

.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-danger {
  padding: 4px 10px;
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(248,81,73,0.3);
  border-radius: 4px;
  font-size: 12px;
}

.btn-danger:hover { background: rgba(248,81,73,0.1); }

/* ============ 表格 ============ */
.table-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}

.table-container h3 { font-size: 15px; font-weight: 600; margin-bottom: 12px; }

.data-table { width: 100%; border-collapse: collapse; }

.data-table th {
  text-align: left;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
}

.data-table tbody tr:hover { background: var(--bg-tertiary); }
.data-table tbody tr:last-child td { border-bottom: none; }

.loading-cell { text-align: center; color: var(--text-secondary); padding: 24px; }

/* ============ 统计卡片 ============ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-label { font-size: 12px; color: var(--text-secondary); }
.stat-value { font-size: 24px; font-weight: 600; }
.stat-value.positive { color: var(--success); }
.stat-value.negative { color: var(--danger); }

/* ============ AI聊天 ============ */
.ai-chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 140px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-message {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
}

.chat-message.assistant {
  align-self: flex-start;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
}

.chat-message.assistant strong { color: var(--accent); }
.chat-message.assistant code {
  background: var(--bg-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Consolas', monospace;
  font-size: 13px;
}

.chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border-color);
}

.chat-input-area input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  outline: none;
}

.chat-input-area input:focus { border-color: var(--accent); }

.btn-send {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.2s;
}

.btn-send:hover { background: var(--accent-hover); }
.btn-send:disabled { opacity: 0.5; }

/* ============ 策略研发 ============ */
.strategy-layout { display: flex; gap: 16px; height: calc(100vh - 140px); }

.strategy-list-panel {
  width: 260px;
  min-width: 260px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow-y: auto;
}

.strategy-list { padding: 8px; }

.strategy-item {
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: background 0.15s;
}

.strategy-item:hover { background: var(--bg-tertiary); }
.strategy-item.active { background: var(--bg-tertiary); }
.strategy-item .name { font-size: 13px; font-weight: 500; }
.strategy-item .meta { font-size: 11px; color: var(--text-secondary); margin-top: 2px; }

.strategy-editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.strategy-editor-header {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
}

.strategy-name-input {
  flex: 1;
  padding: 6px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  outline: none;
}

.strategy-name-input:focus { border-color: var(--accent); }

.code-editor {
  flex: 1;
  padding: 16px;
  background: var(--bg-primary);
  border: none;
  color: var(--text-primary);
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  outline: none;
  tab-size: 4;
}

.backtest-result {
  border-top: 1px solid var(--border-color);
  padding: 16px;
  max-height: 200px;
  overflow-y: auto;
  background: var(--bg-primary);
}

/* ============ 弹窗 ============ */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-content {
  width: 440px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close { font-size: 24px; color: var(--text-secondary); }

.modal-body { padding: 20px; }
.modal-body .form-group { margin-bottom: 16px; }
.modal-body label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }

.modal-body input, .modal-body select {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  outline: none;
}

.modal-body input:focus, .modal-body select:focus { border-color: var(--accent); }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
}

/* ============ AI技能中心 ============ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s;
}

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

.skill-card .icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 12px;
}

.skill-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.skill-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.skill-card .tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ============ 状态标签 ============ */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.badge-success { background: rgba(63,185,80,0.15); color: var(--success); }
.badge-danger { background: rgba(248,81,73,0.15); color: var(--danger); }
.badge-warning { background: rgba(210,153,34,0.15); color: var(--warning); }
.badge-info { background: rgba(88,166,255,0.15); color: var(--accent); }

/* ============ 空状态 ============ */
.empty-state {
  text-align: center;
  padding: 48px;
  color: var(--text-secondary);
}

.empty-state .icon { font-size: 32px; margin-bottom: 12px; }
.empty-state .title { font-size: 15px; font-weight: 500; }
.empty-state .desc { font-size: 13px; margin-top: 4px; }

/* ============ 响应式 ============ */
@media (max-width: 768px) {
  .sidebar { width: 60px; min-width: 60px; }
  .sidebar-title, .nav-item span, .logout-btn { display: none; }
  .content-area { padding: 16px; }
  .strategy-layout { flex-direction: column; height: auto; }
  .strategy-list-panel { width: 100%; max-height: 200px; }
}