/* ============ 文洛 · 仿洛谷风格 ============ */
:root {
  --blue: #3498db;
  --blue-dark: #2980b9;
  --blue-light: #ebf5ff;
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #2c3e50;
  --text2: #7f8c9b;
  --border: #e6ebf1;
  --green: #52c41a;
  --red: #e74c3c;
  --orange: #f39c12;
  --radius: 10px;
  --shadow: 0 1px 4px rgba(31, 56, 88, .1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

/* ---------- 侧边栏 ---------- */
#sidebar {
  position: fixed; left: 0; top: 0; bottom: 0;
  width: 210px; background: var(--card);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  z-index: 10;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  padding: 18px 16px 14px;
}
.logo-mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, #3498db, #6fb3f2);
  color: #fff; font-weight: 700; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
}
.logo-name { font-size: 17px; font-weight: 700; letter-spacing: 1px; }
.logo-sub { font-size: 10px; color: var(--text2); display: block; letter-spacing: 2px; }
.nav { flex: 1; overflow-y: auto; padding: 6px 10px; }
.nav-label {
  font-size: 11px; color: var(--text2);
  padding: 12px 10px 4px; letter-spacing: 1px;
}
.nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; margin: 2px 0;
  border-radius: 8px; color: var(--text);
  transition: background .15s;
}
.nav a .icon { font-size: 16px; width: 20px; text-align: center; }
.nav a:hover { background: #f0f5fa; color: var(--blue-dark); }
.nav a.active { background: var(--blue-light); color: var(--blue); font-weight: 600; }

/* 用户区 */
.user-zone { padding: 10px; border-top: 1px solid var(--border); position: relative; }
.user-card {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 8px; cursor: pointer;
}
.user-card:hover { background: #f0f5fa; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, #3498db, #56b1e8);
  color: #fff; font-weight: 700; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.avatar.small { width: 26px; height: 26px; font-size: 13px; }
.user-card .name { font-weight: 600; }
.user-card .uname { font-size: 12px; color: var(--text2); }
.role-badge {
  font-size: 10px; color: #fff; background: var(--orange);
  padding: 1px 6px; border-radius: 6px; margin-left: 4px; vertical-align: 2px;
}
.login-btn {
  display: block; text-align: center; padding: 10px;
  background: var(--blue); color: #fff !important;
  border-radius: 8px; font-weight: 600;
}
.login-btn:hover { background: var(--blue-dark); }

/* 弹出菜单 */
.popover {
  position: absolute; bottom: 72px; left: 10px; right: 10px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 6px 24px rgba(31,56,88,.18);
  overflow: hidden;
}
.popover .p-head {
  padding: 12px; background: var(--blue-light);
  font-weight: 700; color: var(--blue-dark);
}
.popover a, .popover .p-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; color: var(--text); cursor: pointer;
}
.popover a:hover, .popover .p-item:hover { background: #f0f5fa; }
.popover .divider { height: 1px; background: var(--border); margin: 4px 0; }
.popover .logout { color: var(--red); }

/* ---------- 主区 ---------- */
#main { margin-left: 210px; padding: 24px 28px 60px; }
.container { max-width: 1010px; margin: 0 auto; }
.page-title {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.page-title h1 { font-size: 20px; }
.page-title .sub { font-size: 12px; color: var(--text2); margin-top: 3px; font-weight: 400; }

.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 16px;
}
.card h2 { font-size: 16px; margin-bottom: 12px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* 主页 hero */
.hero {
  background: linear-gradient(120deg, #3498db 0%, #56a9e0 60%, #7ec3f0 100%);
  border-radius: 14px; color: #fff;
  padding: 34px 34px 30px; margin-bottom: 18px;
  box-shadow: 0 4px 18px rgba(52,152,219,.35);
}
.hero h1 { font-size: 26px; margin-bottom: 8px; }
.hero p { opacity: .92; margin-bottom: 20px; font-size: 14px; }
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-hero {
  padding: 10px 22px; border-radius: 10px; font-weight: 600;
  font-size: 14px; cursor: pointer; border: none; transition: .15s;
}
.btn-hero.solid { background: #fff; color: var(--blue); }
.btn-hero.solid:hover { background: #e8f4fd; }
.btn-hero.ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.65); }
.btn-hero.ghost:hover { background: rgba(255,255,255,.28); }

/* 统计 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 18px; }
.stat {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 16px 18px; text-align: center;
}
.stat .num { font-size: 24px; font-weight: 700; color: var(--blue); }
.stat .lab { font-size: 12px; color: var(--text2); margin-top: 4px; }

/* 列表条目 */
.item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 4px; border-bottom: 1px dashed var(--border);
}
.item:last-child { border-bottom: none; }
.item .title { font-size: 14.5px; font-weight: 600; }
.item .title a { color: var(--text); }
.item .title a:hover { color: var(--blue); }
.item .meta { font-size: 12px; color: var(--text2); margin-top: 4px; display: flex; gap: 12px; flex-wrap: wrap; }
.item .meta .num { color: var(--blue); }
.avatar.xs { width: 32px; height: 32px; font-size: 14px; }
.empty { color: var(--text2); text-align: center; padding: 26px 0; }

/* 徽章 */
.badge {
  font-size: 11px; padding: 2px 8px; border-radius: 8px; font-weight: 600;
}
.badge.pending { background: #fdf3e2; color: var(--orange); }
.badge.approved { background: #e9f9e6; color: var(--green); }
.badge.rejected { background: #fdeceb; color: var(--red); }
.badge.ongoing { background: #e9f9e6; color: var(--green); }
.badge.upcoming { background: var(--blue-light); color: var(--blue); }
.badge.ended { background: #eef1f4; color: var(--text2); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 8px; font-size: 13.5px;
  cursor: pointer; border: none; font-weight: 600; transition: .15s;
}
.btn.primary { background: var(--blue); color: #fff; }
.btn.primary:hover { background: var(--blue-dark); }
.btn.green { background: var(--green); color: #fff; }
.btn.green:hover { background: #45a816; }
.btn.red { background: #fff; color: var(--red); border: 1px solid var(--red); }
.btn.red:hover { background: #fdeceb; }
.btn.ghost { background: #fff; color: var(--text2); border: 1px solid var(--border); }
.btn.ghost:hover { color: var(--blue); border-color: var(--blue); }
.btn.sm { padding: 4px 12px; font-size: 12px; border-radius: 6px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* 表单 */
.form-item { margin-bottom: 14px; }
.form-item label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.form-item input, .form-item textarea, .form-item select {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; font-family: inherit;
  outline: none; transition: border .15s; background: #fff; color: var(--text);
}
.form-item input:focus, .form-item textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(52,152,219,.12); }
.form-item textarea { resize: vertical; min-height: 120px; }
.form-item textarea.tall { min-height: 320px; }
.hint { font-size: 12px; color: var(--text2); margin-top: 4px; }
.auth-card { max-width: 420px; margin: 40px auto; }
.auth-tabs { display: flex; margin-bottom: 18px; border-bottom: 2px solid var(--border); }
.auth-tabs .tab {
  flex: 1; text-align: center; padding: 10px; cursor: pointer;
  font-weight: 600; color: var(--text2);
  border-bottom: 2px solid transparent; margin-bottom: -2px;
}
.auth-tabs .tab.active { color: var(--blue); border-color: var(--blue); }

/* 文章/帖子正文 */
.doc-head { border-bottom: 1px solid var(--border); padding-bottom: 14px; margin-bottom: 16px; }
.doc-head h1 { font-size: 22px; margin-bottom: 8px; }
.doc-head .meta { font-size: 12.5px; color: var(--text2); display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.like-btn { background: #fff; border: 1px solid var(--border); }
.like-btn.liked { background: #fdeceb; border-color: var(--red); color: var(--red); }
.doc-content { line-height: 1.85; font-size: 14.5px; word-break: break-word; }
.doc-content h1, .doc-content h2, .doc-content h3 { margin: 18px 0 10px; }
.doc-content h2 { border-left: 4px solid var(--blue); padding-left: 10px; }
.doc-content p { margin: 8px 0; }
.doc-content pre {
  background: #28323c; color: #d7e2ea; padding: 12px 14px;
  border-radius: 8px; overflow-x: auto; font-size: 13px; margin: 10px 0;
}
.doc-content code { background: #eef2f6; padding: 1px 6px; border-radius: 4px; font-size: 13px; font-family: Consolas, monospace; }
.doc-content pre code { background: none; padding: 0; }
.doc-content blockquote { border-left: 4px solid var(--blue); background: var(--blue-light); padding: 8px 14px; margin: 10px 0; border-radius: 0 8px 8px 0; color: #4a6382; }
.doc-content ul, .doc-content ol { padding-left: 24px; margin: 8px 0; }

/* 评论 */
.comment { display: flex; gap: 10px; padding: 12px 0; border-bottom: 1px dashed var(--border); }
.comment:last-child { border: none; }
.comment .c-body { flex: 1; }
.comment .c-meta { font-size: 12px; color: var(--text2); margin-bottom: 4px; }
.comment .c-meta b { color: var(--text); }

/* 排行榜 */
table.rank { width: 100%; border-collapse: collapse; }
table.rank th, table.rank td { padding: 11px 10px; text-align: left; border-bottom: 1px solid var(--border); }
table.rank th { font-size: 12px; color: var(--text2); }
table.rank tr:last-child td { border: none; }
.rank-no { width: 44px; font-weight: 700; color: var(--text2); }
.rank-no.r1, .rank-no.r2, .rank-no.r3 { text-align: center; }
.rank-no.r1 { color: #f5a623; }
.rank-no.r2 { color: #9aa7b3; }
.rank-no.r3 { color: #d28a55; }
.who { display: flex; align-items: center; gap: 8px; }
.score { color: var(--blue); font-weight: 700; }

/* 比赛卡片 */
.contest { display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.contest .c-title { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.contest .c-meta { font-size: 12px; color: var(--text2); display: flex; gap: 12px; flex-wrap: wrap; }

/* Tabs */
.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs .t {
  padding: 6px 16px; border-radius: 18px; cursor: pointer;
  font-size: 13px; background: #fff; border: 1px solid var(--border); color: var(--text2);
}
.tabs .t.active { background: var(--blue); color: #fff; border-color: var(--blue); font-weight: 600; }

/* 审核 */
.review-item { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin-bottom: 12px; }
.review-item .r-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.review-item .r-title { font-weight: 700; font-size: 14.5px; flex: 1; }
.review-item .r-content {
  background: #f8fafc; border-radius: 8px; padding: 10px 12px;
  font-size: 13.5px; line-height: 1.7; margin-bottom: 10px;
  max-height: 220px; overflow-y: auto; white-space: pre-wrap;
}
.review-item .r-actions { display: flex; gap: 10px; align-items: center; }

/* 个人主页 */
.profile-head { display: flex; gap: 18px; align-items: center; }
.avatar.big { width: 64px; height: 64px; font-size: 28px; }
.profile-stats { display: flex; gap: 26px; margin-top: 14px; }
.profile-stats .ps { text-align: center; }
.profile-stats .ps b { display: block; font-size: 20px; color: var(--blue); }

/* toast */
#toast-wrap { position: fixed; top: 22px; left: 50%; transform: translateX(-50%); z-index: 99; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast {
  padding: 10px 22px; border-radius: 10px; color: #fff; font-size: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,.18); animation: fadein .25s;
}
.toast.ok { background: var(--green); }
.toast.err { background: var(--red); }
@keyframes fadein { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; } }

/* 搜索与筛选 */
.search-box { display: flex; gap: 8px; margin-bottom: 12px; }
.search-box input {
  flex: 1; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 13.5px; outline: none; transition: border .15s;
  background: #fff; color: var(--text);
}
.search-box input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(52,152,219,.12); }
.filter-row { display: flex; gap: 10px; margin-bottom: 12px; align-items: center; }
.mini-select {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 13.5px; background: #fff; color: var(--text); outline: none;
}

/* 题库 */
.diff-badge {
  display: inline-block; color: #fff; font-size: 11px; font-weight: 700;
  padding: 2px 9px; border-radius: 9px; vertical-align: 2px; margin-right: 4px;
}
.type-badge {
  display: inline-block; font-size: 11px; color: var(--blue);
  background: var(--blue-light); padding: 1px 8px; border-radius: 8px; margin-left: 4px; vertical-align: 2px;
}
.tag-chip {
  display: inline-block; font-size: 11px; color: var(--text2);
  background: #eef1f4; padding: 1px 8px; border-radius: 8px; margin-left: 4px; vertical-align: 2px;
}
.problem-item .title a { margin-left: 2px; }

/* 私信 */
.msg-badge {
  display: inline-block; background: var(--red); color: #fff;
  font-size: 10px; font-weight: 700; line-height: 16px;
  min-width: 16px; text-align: center; border-radius: 8px; padding: 0 5px;
}
.bubble-row { display: flex; margin: 8px 0; }
.bubble-row.me { justify-content: flex-end; }
.bubble {
  max-width: 72%; padding: 8px 12px; border-radius: 12px;
  background: #fff; border: 1px solid var(--border);
  font-size: 14px; word-break: break-word;
}
.bubble-row.me .bubble { background: var(--blue); color: #fff; border-color: var(--blue); }
.bubble .t { font-size: 11px; opacity: .65; margin-top: 4px; }

.loading-block { text-align: center; color: var(--text2); padding: 60px 0; }

/* 响应式 */
@media (max-width: 900px) {
  #sidebar { width: 60px; }
  .logo-name, .logo-sub, .nav a span.txt, .nav-label, .user-card .uinfo { display: none; }
  .logo { justify-content: center; padding: 14px 8px; }
  .nav a { justify-content: center; }
  #main { margin-left: 60px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}