:root {
  --bg: #f4f1ea;
  --surface: #ffffff;
  --ink: #1c1b18;
  --ink-soft: #6b6760;
  --line: #e4ded2;
  --accent: #2f6f4e;
  --accent-soft: #e7f0ea;
  --warn: #b4541f;
  --shadow: 0 1px 2px rgba(28,27,24,.06), 0 8px 24px rgba(28,27,24,.05);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo { font-size: 28px; flex: none; }
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: .5px; }
.brand-sub { font-size: 12px; color: var(--ink-soft); }
.home-link { color: var(--accent); text-decoration: none; font-size: 14px; font-weight: 600; white-space: nowrap; flex: none; }

.container { max-width: 760px; margin: 0 auto; padding: 24px 18px 60px; }

.section-title {
  font-size: 14px; font-weight: 700; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 1px; margin: 0;
}

.composer, .reply-composer {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px; box-shadow: var(--shadow);
}
.post-form, .reply-form { display: flex; flex-direction: column; gap: 12px; }
.input, .textarea, .select {
  width: 100%; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 13px; font-size: 15px; font-family: inherit; background: #fbfaf7;
  color: var(--ink); outline: none; transition: border-color .15s;
}
.input:focus, .textarea:focus, .select:focus { border-color: var(--accent); }
.textarea { min-height: 90px; resize: vertical; }
.form-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.select { width: auto; flex: 0 0 110px; }
#post-tags { flex: 1; min-width: 140px; }
.btn-primary {
  margin-left: auto; background: var(--accent); color: #fff; border: none;
  border-radius: 10px; padding: 11px 22px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: opacity .15s;
}
.btn-primary:hover { opacity: .9; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.feed { margin-top: 8px; }
.feed-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin: 28px 0 12px; flex-wrap: wrap;
}
.category-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
}
.cat-tab {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft);
  border-radius: 999px; padding: 5px 13px; font-size: 13px; cursor: pointer; transition: all .15s;
}
.cat-tab:hover { border-color: var(--accent); color: var(--accent); }
.cat-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.post-list { display: flex; flex-direction: column; gap: 14px; }
.post-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px 18px; box-shadow: var(--shadow); cursor: pointer; transition: transform .12s;
}
.post-card:hover { transform: translateY(-2px); }
.post-card.pinned { border-color: var(--accent); background: #f8fbf9; }
.post-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.post-title { font-size: 17px; font-weight: 700; margin: 0; line-height: 1.4; }
.post-excerpt { color: var(--ink-soft); font-size: 14px; margin: 0 0 10px; word-break: break-word; }
.post-meta { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--ink-soft); align-items: center; }
.tag { color: var(--accent); background: var(--accent-soft); padding: 1px 8px; border-radius: 999px; font-size: 11px; }

.cat { font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 999px; background: #eee; color: #555; flex: none; }
.cat-general { background: #eef0f2; color: #4a5568; }
.cat-ai-tools { background: #e8f0fb; color: #2b6cb0; }
.cat-tutorial { background: #f0ebf8; color: #6b46c1; }
.cat-showcase { background: #fdf0e8; color: #c05621; }
.cat-chat { background: #e7f0ea; color: #2f6f4e; }

.pin-mark { font-size: 12px; color: var(--accent); font-weight: 600; flex: none; }
.rejected-mark { font-size: 11px; color: #fff; background: var(--warn); padding: 1px 7px; border-radius: 999px; flex: none; }

.like-btn {
  display: inline-flex; align-items: center; gap: 4px; cursor: pointer;
  color: var(--ink-soft); user-select: none;
}
.like-btn .like-icon { color: #bbb; transition: color .15s; }
.like-btn.liked .like-icon { color: #e53e3e; }
.like-btn:hover .like-icon { color: #e53e3e; }

.admin-bar {
  display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap;
}
.admin-bar-block { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }
.admin-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft);
  border-radius: 8px; padding: 5px 12px; font-size: 12px; cursor: pointer;
}
.admin-btn:hover { border-color: var(--accent); color: var(--accent); }
.admin-btn.danger:hover { border-color: var(--warn); color: var(--warn); }

.loading, .empty { text-align: center; color: var(--ink-soft); padding: 40px 0; font-size: 14px; }

.pager { display: flex; justify-content: center; align-items: center; gap: 12px; margin-top: 24px; }
.pager-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  border-radius: 10px; padding: 8px 16px; font-size: 14px; cursor: pointer;
}
.pager-btn:hover { border-color: var(--accent); color: var(--accent); }
.pager-info { font-size: 14px; color: var(--ink-soft); }

.thread-post { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; box-shadow: var(--shadow); }
.thread-post.pinned { border-color: var(--accent); background: #f8fbf9; }
.thread-title { font-size: 22px; margin: 0 0 8px; line-height: 1.35; }
.thread-meta { display: flex; gap: 14px; font-size: 13px; color: var(--ink-soft); margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.thread-body { white-space: pre-wrap; font-size: 15px; word-break: break-word; }

.replies { margin-top: 26px; }
.replies-title { font-size: 16px; margin: 0 0 12px; }
.reply { border-top: 1px solid var(--line); padding: 14px 0; }
.reply.rejected { opacity: .6; }
.reply-meta { display: flex; gap: 12px; font-size: 12px; color: var(--ink-soft); margin-bottom: 4px; flex-wrap: wrap; align-items: center; }
.reply-author { font-weight: 600; color: var(--ink); }
.reply-content { white-space: pre-wrap; font-size: 14px; word-break: break-word; }

.reply-composer { margin-top: 24px; }

.site-footer { text-align: center; color: var(--ink-soft); font-size: 12px; padding: 24px; }
.site-footer .footer-note {
  margin: 8px auto 0; max-width: 640px; line-height: 1.7;
  color: #8a8578; font-size: 11px; text-align: center;
}

.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: #1c1b18; color: #fff; padding: 11px 20px; border-radius: 10px;
  font-size: 14px; opacity: 0; pointer-events: none; transition: all .25s; z-index: 50;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok { background: var(--accent); }
.toast.err { background: var(--warn); }

@media (max-width: 600px) {
  .site-header { padding: 14px 16px; }
  .brand-name { font-size: 16px; }
  .brand-sub { font-size: 11px; }
  .home-link { font-size: 13px; }

  .container { padding: 16px 14px 50px; }
  .composer, .reply-composer { padding: 14px; border-radius: 12px; }

  .feed-header { margin: 20px 0 10px; }
  .category-tabs { gap: 6px; }
  .cat-tab { padding: 4px 11px; font-size: 12px; }

  .form-row { flex-direction: column; align-items: stretch; gap: 10px; }
  .select { width: 100%; flex: none; }
  .btn-primary { margin-left: 0; width: 100%; }

  .post-card { padding: 14px; border-radius: 12px; }
  .post-head { gap: 8px; }
  .post-title { font-size: 16px; width: 100%; }
  .post-meta { gap: 10px; }

  .thread-title { font-size: 19px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
  .thread-post { padding: 18px; }

  .brand-sub { display: none; }
  .logo { font-size: 22px; }
  .site-header { gap: 8px; }
  .thread-meta, .post-meta { gap: 8px; }
  .admin-bar { gap: 6px; }
  .reply-composer { margin-bottom: env(safe-area-inset-bottom, 0); }
  .pin-mark, .rejected-mark { margin-left: 4px; vertical-align: middle; }
}

@media (max-width: 380px) {
  .brand-name { font-size: 15px; }
  .home-link { font-size: 12px; }
  .post-title { font-size: 15px; }
  .thread-title { font-size: 17px; }
  .container { padding: 14px 12px 56px; }
}