/* ========== 基础主题与变量 ========== */
.messages { list-style: none; padding: 0; margin: 0 0 12px; }
.messages li { padding: 10px 12px; margin-bottom: 8px; border-radius: 4px; }
.messages li.info { background: #eef6ff; color: #0b5cad; border: 1px solid #cfe2ff; }
.messages li.success { background: #e9f7ef; color: #1e7e34; border: 1px solid #c7eed8; }
.messages li.warning { background: #fff4e5; color: #946200; border: 1px solid #ffe8cc; }
.messages li.error { background: #fdecea; color: #b02a37; border: 1px solid #f5c2c7; }
header nav { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
header nav .spacer { flex: 1; }
header nav .user-info { opacity: 0.85; }
:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #5b6572;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-600: #1e40af;
  --primary-50: #eef2ff;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --shadow: 0 8px 24px rgba(31, 35, 40, 0.08);
  --radius: 12px;
}

/* 全局排版与基础 */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", "Noto Sans", sans-serif;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1040px;
  margin: 24px auto;
  padding: 0 16px;
}

/* ========== 顶部导航 ========== */
.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow);
}
.header-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-logo {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  box-shadow: 0 6px 16px rgba(96, 165, 250, .35);
}
.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .2px;
}
.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
}
.nav a.active,
.nav a:hover {
  background: var(--primary-50);
  color: var(--primary);
}

/* ========== 搜索与工具条 ========== */
.toolbar {
  display: flex;
  gap: 12px;
  margin: 16px 0;
  flex-wrap: wrap;
}
.search {
  flex: 1 1 280px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  box-shadow: var(--shadow);
}
.search input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 14px;
  background: transparent;
}
.filter {
  display: flex;
  gap: 8px;
}

/* ========== 按钮、标签与状态 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}
.btn-primary:hover { background: var(--primary-600); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: var(--primary-50);
  color: var(--primary);
}
.badge.gray {
  background: #f3f4f6; color: var(--muted);
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--success);
}

/* ========== 帖子列表卡片 ========== */
.posts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.post {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 16px;
}
.post:hover { transform: translateY(-1px); transition: transform .15s ease; }

.post-avatar {
  width: 56px; height: 56px; border-radius: 14px;
  background: #e2e8f0;
  overflow: hidden;
}
.post-avatar img { width: 100%; height: 100%; object-fit: cover; }

.post-main { display: grid; gap: 6px; }
.post-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  line-height: 1.4;
}
.post-title a { color: var(--text); }
.post-title a:hover { color: var(--primary); }

.post-meta {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.post-content {
  font-size: 14px;
  color: #2b313b;
  line-height: 1.7;
}

.post-side {
  display: grid;
  align-content: start;
  gap: 8px;
  text-align: right;
}
.kpi {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}
.kpi strong { color: var(--text); }

/* ========== 帖子详情 ========== */
.article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.article-title {
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 10px 0;
}
.article-meta {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}
.article-content {
  font-size: 16px;
  line-height: 1.85;
}
.article-content p { margin: 0 0 16px; }
.article-content img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}

/* ========== 评论区 ========== */
.comments {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}
.comment {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}
.comment-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.comment-avatar {
  width: 32px; height: 32px; border-radius: 8px;
  background: #e2e8f0;
  overflow: hidden;
}
.comment-author { font-weight: 700; }
.comment-time { font-size: 12px; color: var(--muted); margin-left: auto; }
.comment-body { font-size: 14px; line-height: 1.7; }

/* ========== 表单 ========== */
.form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.form-row { display: grid; gap: 8px; margin-bottom: 12px; }
.label { font-size: 13px; color: var(--muted); }
.input, textarea, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  background: #fff;
  outline: none;
}
textarea { min-height: 120px; resize: vertical; }
.input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
.form-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
}
.page {
  min-width: 36px;
  height: 36px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
}
.page.active {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}
.page:hover { transform: translateY(-1px); }

/* ========== 系统消息与空态 ========== */
.alert {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--primary-50);
  color: var(--primary-600);
}
.alert.success { background: #ecfdf5; color: var(--success); border-color: #d1fae5; }
.alert.warning { background: #fffbeb; color: var(--warning); border-color: #fde68a; }
.alert.danger  { background: #fef2f2; color: var(--danger);  border-color: #fecaca; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 24px;
}
.empty .emoji {
  font-size: 28px;
  display: block;
  margin-bottom: 8px;
}

/* ========== 页脚 ========== */
.footer {
  margin: 24px 0;
  color: var(--muted);
  text-align: center;
}

/* ========== 响应式 ========== */
@media (max-width: 720px) {
  .post {
    grid-template-columns: 40px 1fr;
  }
  .post-side { display: none; }
  .brand-name { font-size: 16px; }
  .header-inner { padding: 10px 12px; }
}