/* ══════════════════════════════════════════
   秦汉校园墙 · style.css
   支持：手机 / 电脑 / 智能白板（1400px+）
   ══════════════════════════════════════════ */

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

:root{
  --p900:#1A0B35;
  --p800:#2D1560;
  --p700:#4A2490;
  --p600:#5B2D8E;
  --p500:#7B3FBE;
  --p400:#9B5FD4;
  --p300:#C09EE8;
  --p200:#DDD0F5;
  --p100:#EDE5F7;
  --p50:#F7F4FD;
  --white:#FFFFFF;
  --ink:#1A0F2E;
  --gray50:#F9F8FC;
  --gray100:#F0EDF8;
  --gray200:#DDD8EE;
  --gray400:#9B8BB4;
  --gray600:#5C4E74;
  --pink:#D4537E;
  --pink-bg:#FBEAF0;
  --amber:#BA7517;
  --amber-bg:#FAEEDA;
  --teal:#0F6E56;
  --teal-bg:#E1F5EE;
  --blue:#185FA5;
  --blue-bg:#E6F1FB;
}

html{scroll-behavior:smooth;}

body{
  font-family:'Noto Sans SC',sans-serif;
  background:var(--gray50);
  color:var(--ink);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

/* ─── TOPBAR ─── */
.topbar{
  background:var(--p900);
  height:36px;
  display:flex;align-items:center;
  padding:0 clamp(16px,4vw,48px);
  justify-content:space-between;
}
.topbar-l{font-size:11px;color:rgba(255,255,255,.45);letter-spacing:.8px;}
.topbar-r{display:flex;gap:20px;}
.topbar-r a{font-size:11px;color:rgba(255,255,255,.5);text-decoration:none;transition:color .2s;}
.topbar-r a:hover{color:rgba(255,255,255,.9);}

/* ─── NAV ─── */
.nav{
  background:var(--white);
  border-bottom:1px solid var(--p200);
  position:sticky;top:0;z-index:200;
  display:flex;align-items:center;
  height:60px;
  padding:0 clamp(16px,4vw,48px);
}
.nav-brand{
  display:flex;align-items:center;gap:12px;
  text-decoration:none;margin-right:28px;flex-shrink:0;
}
.logo-mark{
  width:40px;height:40px;flex-shrink:0;
  object-fit:cover;border-radius:50%;
}
.nav-title{display:flex;flex-direction:column;}
.nav-title-zh{font-size:16px;font-weight:900;color:var(--p600);letter-spacing:2px;line-height:1.1;}
.nav-title-en{font-size:9px;color:var(--gray400);letter-spacing:.8px;font-weight:400;}

.nav-right{margin-left:auto;display:flex;align-items:center;gap:8px;}
.nav-icon-btn{
  width:36px;height:36px;border-radius:50%;
  background:none;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  color:var(--gray600);transition:all .2s;flex-shrink:0;
}
.nav-icon-btn:hover{background:var(--p100);color:var(--p600);}

.btn-auth{
  border:none;background:var(--p50);color:var(--p600);
  padding:6px 14px;border-radius:16px;
  font-size:12px;font-weight:700;cursor:pointer;
  transition:all .2s;white-space:nowrap;flex-shrink:0;
  font-family:'Noto Sans SC',sans-serif;
}
.btn-auth:hover{background:var(--p100);}

.btn-post{
  display:flex;align-items:center;gap:6px;
  padding:8px 18px;background:var(--p600);
  border:none;border-radius:24px;
  font-family:'Noto Sans SC',sans-serif;
  font-size:13px;font-weight:700;color:white;
  cursor:pointer;transition:all .2s;white-space:nowrap;flex-shrink:0;
}
.btn-post:hover{background:var(--p500);transform:translateY(-1px);box-shadow:0 6px 20px rgba(91,45,142,.3);}
.btn-post:active{transform:scale(.97);}

/* ─── HAMBURGER + MOBILE MENU ─── */
.hamburger{display:none;background:none;border:none;cursor:pointer;color:var(--gray600);padding:8px;}
.nav-mobile-menu{
  display:none;position:fixed;top:60px;left:0;right:0;bottom:0;
  background:var(--white);z-index:199;
  padding:20px 16px;flex-direction:column;gap:4px;
  border-top:1px solid var(--p100);overflow-y:auto;
}
.nav-mobile-menu.open{display:flex;}
.nav-mobile-tab{
  display:flex;align-items:center;gap:10px;
  padding:13px 16px;border-radius:12px;
  font-size:14px;font-weight:500;color:var(--ink);
  text-decoration:none;transition:all .2s;cursor:pointer;
  background:none;border:none;font-family:'Noto Sans SC',sans-serif;
  text-align:left;width:100%;
}
.nav-mobile-tab:hover,.nav-mobile-tab.active{background:var(--p50);color:var(--p600);}
.nav-mobile-divider{height:1px;background:var(--p100);margin:8px 0;}

/* ─── HERO ─── */
.hero{
  background:linear-gradient(135deg,var(--p800) 0%,var(--p600) 55%,var(--p400) 100%);
  padding:clamp(32px,5vw,64px) clamp(16px,4vw,48px);
  position:relative;overflow:hidden;
}
.hero-circle1{position:absolute;right:-80px;top:-80px;width:400px;height:400px;border-radius:50%;background:rgba(255,255,255,.04);pointer-events:none;}
.hero-circle2{position:absolute;left:-40px;bottom:-120px;width:300px;height:300px;border-radius:50%;background:rgba(255,255,255,.03);pointer-events:none;}
.hero-circle3{position:absolute;right:25%;top:20%;width:160px;height:160px;border-radius:50%;background:rgba(255,255,255,.04);pointer-events:none;}
.hero-inner{
  position:relative;z-index:1;
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:1fr auto;
  gap:40px;align-items:center;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.18);border-radius:20px;
  font-size:11px;color:rgba(255,255,255,.8);letter-spacing:1px;margin-bottom:16px;
}
.hero-dot{
  width:5px;height:5px;border-radius:50%;
  background:#B8E986;animation:breathe 2s infinite;
}
@keyframes breathe{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.4;transform:scale(.8);}}
.hero-h1{
  font-size:clamp(28px,5vw,52px);font-weight:900;color:white;
  line-height:1.1;letter-spacing:1px;margin-bottom:12px;
}
.hero-h1 em{
  font-style:normal;color:rgba(255,255,255,.5);font-weight:300;
  font-size:clamp(14px,2.5vw,22px);display:block;margin-top:4px;letter-spacing:.5px;
}
.hero-desc{
  font-size:clamp(13px,1.5vw,15px);color:rgba(255,255,255,.6);
  line-height:1.8;margin-bottom:28px;max-width:520px;
}
.hero-stats{display:flex;gap:clamp(20px,4vw,48px);}
.hero-stat-num{font-size:clamp(20px,3vw,30px);font-weight:900;color:white;line-height:1;}
.hero-stat-label{font-size:11px;color:rgba(255,255,255,.45);letter-spacing:.5px;margin-top:2px;}
.hero-right{display:flex;flex-direction:column;gap:12px;flex-shrink:0;}
.hero-quick-card{
  background:rgba(255,255,255,.1);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.15);border-radius:16px;padding:16px 20px;min-width:220px;
}
.hero-quick-date{font-size:13px;font-weight:700;color:white;}
.hero-quick-week{font-size:11px;color:rgba(255,255,255,.55);margin-bottom:10px;}
.hero-notice-item{
  display:flex;align-items:flex-start;gap:8px;padding:8px 0;
  border-top:1px solid rgba(255,255,255,.08);
  font-size:12px;color:rgba(255,255,255,.75);line-height:1.5;
}
.hero-notice-dot{width:5px;height:5px;border-radius:50%;background:rgba(255,255,255,.5);margin-top:5px;flex-shrink:0;}
.hero-countdown{
  background:rgba(255,200,80,.15);border:1px solid rgba(255,200,80,.25);
  border-radius:10px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;
}
.hero-countdown-label{font-size:11px;color:rgba(255,255,255,.6);}
.hero-countdown-num{font-size:20px;font-weight:900;color:#FFD580;}

/* ─── CATEGORY STRIP ─── */
.cat-strip{
  background:var(--white);border-bottom:1px solid var(--p100);
  padding:0 clamp(16px,4vw,48px);
  display:flex;align-items:center;overflow-x:auto;scrollbar-width:none;
  -webkit-overflow-scrolling:touch;gap:4px;
}
.cat-strip::-webkit-scrollbar{display:none;}
.cat-pill-strip{
  display:flex;align-items:center;gap:6px;
  padding:12px 14px;border-radius:12px;
  font-size:13px;font-weight:500;color:var(--gray600);
  white-space:nowrap;cursor:pointer;transition:all .2s;
  border:none;background:none;font-family:'Noto Sans SC',sans-serif;
}
.cat-pill-strip:hover{background:var(--p50);color:var(--p600);}
.cat-pill-strip.active{background:var(--p100);color:var(--p600);font-weight:700;}
.cat-pill-count{
  font-size:11px;color:var(--gray400);
  background:var(--gray100);border-radius:10px;padding:1px 7px;
}
.cat-pill-strip.active .cat-pill-count{background:var(--p200);color:var(--p600);}

/* ─── MAIN LAYOUT ─── */
.main{
  max-width:1200px;margin:0 auto;
  padding:clamp(20px,3vw,36px) clamp(16px,4vw,48px);
  display:grid;grid-template-columns:1fr 300px;
  gap:clamp(16px,2.5vw,28px);align-items:start;
}

/* ─── FEED HEADER ─── */
.feed-header{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:16px;
}
.feed-title{font-size:15px;font-weight:700;color:var(--ink);}
.feed-filters{display:flex;gap:6px;}
.filter-btn{
  padding:5px 14px;border-radius:20px;
  border:1px solid var(--gray200);background:white;
  font-size:12px;font-weight:500;color:var(--gray600);
  cursor:pointer;transition:all .2s;font-family:'Noto Sans SC',sans-serif;
}
.filter-btn:hover{border-color:var(--p300);color:var(--p600);}
.filter-btn.active{background:var(--p600);border-color:var(--p600);color:white;}

/* ─── POST CARD ─── */
.post-card{
  background:var(--white);border:1px solid var(--gray200);
  border-radius:20px;padding:20px 22px;margin-bottom:12px;
  transition:all .25s;position:relative;overflow:hidden;cursor:pointer;
}
.post-card:hover{
  border-color:var(--p300);
  box-shadow:0 8px 32px rgba(91,45,142,.08);
  transform:translateY(-2px);
}
.post-card::before{
  content:'';position:absolute;left:0;top:0;bottom:0;width:3px;
  border-radius:20px 0 0 20px;
}
.post-card.cat-love::before{background:var(--pink);}
.post-card.cat-lost::before{background:var(--amber);}
.post-card.cat-notice::before{background:var(--p600);}
.post-card.cat-rant::before{background:var(--teal);}
.post-card.cat-ask::before{background:var(--gray400);}
.post-card.cat-trade::before{background:var(--blue);}

.post-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:10px;}
.post-top-right{display:flex;align-items:center;gap:6px;flex-shrink:0;}
.post-meta{display:flex;align-items:center;gap:10px;}

.avatar{
  width:34px;height:34px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:white;flex-shrink:0;
}
.av-pink{background:var(--pink);}
.av-purple{background:var(--p500);}
.av-teal{background:#1D9E75;}
.av-amber{background:#EF9F27;}
.av-blue{background:#378ADD;}
.av-gray{background:var(--gray400);}

.post-author{font-size:13px;font-weight:700;color:var(--ink);line-height:1.2;}
.post-time{font-size:11px;color:var(--gray400);}

.cat-badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:10px;
  font-size:11px;font-weight:700;letter-spacing:.3px;flex-shrink:0;
}
.badge-love{background:var(--pink-bg);color:var(--pink);}
.badge-lost{background:var(--amber-bg);color:var(--amber);}
.badge-notice{background:var(--p100);color:var(--p600);}
.badge-rant{background:var(--teal-bg);color:var(--teal);}
.badge-ask{background:var(--gray100);color:var(--gray600);}
.badge-trade{background:var(--blue-bg);color:var(--blue);}

.pin-badge{
  display:inline-flex;align-items:center;gap:3px;
  padding:2px 8px;border-radius:6px;
  font-size:10px;font-weight:700;
  background:var(--p100);color:var(--p600);
  white-space:nowrap;flex-shrink:0;
}

.post-content{font-size:14px;line-height:1.8;color:#2D1F45;margin-bottom:12px;}
.post-content strong{color:var(--p600);}

.post-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:12px;}
.post-tag{padding:2px 10px;background:var(--gray100);border-radius:10px;font-size:11px;color:var(--gray600);}

.post-actions{display:flex;align-items:center;border-top:1px solid var(--gray100);padding-top:10px;}
.action-btn{
  display:flex;align-items:center;gap:4px;
  padding:5px 12px;border:none;background:none;
  font-family:'Noto Sans SC',sans-serif;
  font-size:12px;color:var(--gray400);cursor:pointer;border-radius:8px;transition:all .2s;
}
.action-btn:hover{background:var(--p50);color:var(--p600);}
.action-btn.liked{color:var(--pink);}
.action-btn svg{width:14px;height:14px;}
.action-btn .count{font-weight:600;}

/* ─── COMMENTS ─── */
.comments-wrap{overflow:hidden;max-height:0;transition:max-height .35s ease,opacity .25s ease;opacity:0;}
.comments-wrap.open{max-height:1000px;opacity:1;}
.comments-inner{border-top:1px solid var(--gray100);margin-top:10px;padding-top:12px;}
.comment-item{display:flex;gap:9px;padding:8px 0;border-bottom:1px solid var(--gray100);}
.comment-item:last-of-type{border-bottom:none;padding-bottom:4px;}
.c-avatar{
  width:26px;height:26px;border-radius:50%;
  background:var(--p100);display:flex;align-items:center;justify-content:center;
  font-size:10px;font-weight:700;color:var(--p600);flex-shrink:0;
}
.c-meta{display:flex;align-items:baseline;gap:6px;margin-bottom:2px;}
.c-name{font-size:12px;font-weight:700;color:var(--ink);}
.c-time{font-size:11px;color:var(--gray400);}
.c-text{font-size:13px;color:#2D1F45;line-height:1.65;}
.c-reply-btn{
  font-size:11px;color:var(--p500);background:none;border:none;cursor:pointer;
  padding:3px 0;font-family:'Noto Sans SC',sans-serif;transition:color .15s;
  margin-top:2px;display:inline-block;
}
.c-reply-btn:hover{color:var(--p700);}
.c-input-row{
  display:flex;gap:8px;align-items:center;
  margin-top:10px;padding-top:10px;border-top:1px solid var(--gray100);
}
.c-avatar-self{
  width:28px;height:28px;border-radius:50%;background:var(--p200);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:var(--p700);flex-shrink:0;
}
.c-input{
  flex:1;border:1px solid var(--gray200);border-radius:20px;padding:7px 14px;
  font-size:12px;font-family:'Noto Sans SC',sans-serif;
  outline:none;color:var(--ink);background:var(--gray50);transition:border .2s;
}
.c-input:focus{border-color:var(--p400);background:white;}
.c-send{
  padding:7px 16px;background:var(--p600);color:white;border:none;border-radius:20px;
  font-size:12px;font-family:'Noto Sans SC',sans-serif;font-weight:700;cursor:pointer;
  transition:all .2s;white-space:nowrap;
}
.c-send:hover{background:var(--p500);}
.c-send:active{transform:scale(.96);}
.cmt-toggle-btn.active{color:var(--p600);background:var(--p50);}
.cmt-toggle-btn.active svg{stroke:var(--p600);}

/* ─── DYNAMIC POSTS AREA ─── */
#dynamic-posts .post-card{opacity:0;animation:fadeSlideIn .3s ease forwards;}
@keyframes fadeSlideIn{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}

.empty-state{text-align:center;padding:60px 20px;color:var(--gray400);}
.empty-state-icon{font-size:36px;margin-bottom:12px;}
.empty-state-title{font-size:15px;font-weight:700;margin-bottom:4px;color:var(--gray600);}
.empty-state-sub{font-size:12px;}

.loading-state{
  display:flex;align-items:center;justify-content:center;gap:8px;
  padding:48px 20px;color:var(--gray400);font-size:13px;
}
.loading-dot{
  width:6px;height:6px;border-radius:50%;background:var(--p400);
  animation:loadBounce 1.2s infinite ease-in-out;
}
.loading-dot:nth-child(2){animation-delay:.2s;}
.loading-dot:nth-child(3){animation-delay:.4s;}
@keyframes loadBounce{0%,80%,100%{transform:scale(0);}40%{transform:scale(1);}}

/* ─── SIDEBAR ─── */
.sidebar{position:sticky;top:76px;}
.sidebar-card{
  background:var(--white);border:1px solid var(--gray200);
  border-radius:20px;overflow:hidden;margin-bottom:12px;
}
.sidebar-head{
  padding:14px 18px 10px;border-bottom:1px solid var(--p50);
  display:flex;align-items:center;gap:8px;
}
.sidebar-head h3{font-size:13px;font-weight:700;color:var(--ink);}
.sidebar-icon{
  width:24px;height:24px;background:var(--p100);border-radius:6px;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.sidebar-body{padding:14px 18px;}
.notice-list{display:flex;flex-direction:column;}
.notice-item{
  display:flex;align-items:flex-start;gap:8px;
  padding:9px 0;border-bottom:1px solid var(--gray100);
}
.notice-item:last-child{border-bottom:none;}
.notice-dot{width:6px;height:6px;border-radius:50%;background:var(--p400);margin-top:5px;flex-shrink:0;}
.notice-text{font-size:12px;color:var(--ink);line-height:1.5;}
.notice-date{font-size:11px;color:var(--gray400);margin-top:2px;}
.cat-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.cat-item{
  display:flex;align-items:center;gap:8px;padding:10px;border-radius:12px;
  background:var(--gray50);text-decoration:none;transition:all .2s;
  border:1px solid transparent;cursor:pointer;
}
.cat-item:hover{background:var(--p50);border-color:var(--p200);}
.cat-ico{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.cat-label{font-size:12px;font-weight:700;color:var(--ink);}
.cat-count{font-size:10px;color:var(--gray400);}
.leader-list{display:flex;flex-direction:column;}
.leader-item{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--gray100);}
.leader-item:last-child{border-bottom:none;}
.rank-num{width:20px;height:20px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:900;flex-shrink:0;}
.rank-1{background:var(--p600);color:white;}
.rank-2{background:var(--p300);color:var(--p800);}
.rank-3{background:var(--p200);color:var(--p700);}
.rank-n{background:var(--gray100);color:var(--gray600);}
.leader-name{font-size:12px;color:var(--ink);flex:1;line-height:1.4;}
.leader-score{font-size:11px;font-weight:700;color:var(--gray400);white-space:nowrap;}

/* ─── MODALS ─── */
.modal-overlay{
  position:fixed;inset:0;background:rgba(20,5,50,.55);
  z-index:500;display:none;align-items:flex-end;justify-content:center;
  backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
}
.modal-overlay.open{display:flex;}
@media(min-width:640px){
  .modal-overlay{align-items:center;}
  .modal{border-radius:24px!important;}
}
.modal{
  background:var(--white);border-radius:24px 24px 0 0;
  width:100%;max-width:520px;max-height:90vh;overflow-y:auto;
  padding:24px;animation:slideUp .3s ease;
}
@keyframes slideUp{from{transform:translateY(40px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;}
.modal-head h2{font-size:18px;font-weight:900;color:var(--ink);}
.modal-close{
  width:32px;height:32px;border-radius:50%;background:var(--gray100);
  border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;
  color:var(--gray600);transition:all .2s;
}
.modal-close:hover{background:var(--p100);color:var(--p600);}
.modal-label{font-size:12px;color:var(--gray400);margin-bottom:8px;font-weight:500;}
.cat-selector{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px;}
.cat-pill{
  padding:6px 14px;border-radius:20px;border:1px solid var(--gray200);
  background:white;font-family:'Noto Sans SC',sans-serif;
  font-size:12px;font-weight:500;color:var(--gray600);cursor:pointer;transition:all .2s;
}
.cat-pill.selected{background:var(--p600);border-color:var(--p600);color:white;}
.modal-input{
  width:100%;border:1px solid var(--gray200);border-radius:10px;
  padding:10px 14px;font-family:'Noto Sans SC',sans-serif;
  font-size:13px;color:var(--ink);outline:none;transition:border .2s;margin-bottom:12px;
}
.modal-input:focus{border-color:var(--p400);}
.modal-textarea{
  width:100%;border:1px solid var(--gray200);border-radius:14px;
  padding:14px 16px;font-family:'Noto Sans SC',sans-serif;
  font-size:14px;color:var(--ink);min-height:120px;resize:none;outline:none;
  transition:border .2s;margin-bottom:12px;
}
.modal-textarea:focus{border-color:var(--p400);}
.modal-foot{display:flex;align-items:center;justify-content:space-between;}
.modal-hint{font-size:11px;color:var(--gray400);}
.btn-submit{
  padding:10px 28px;background:var(--p600);border:none;border-radius:20px;
  font-family:'Noto Sans SC',sans-serif;font-size:13px;font-weight:700;color:white;
  cursor:pointer;transition:all .2s;
}
.btn-submit:hover{background:var(--p500);}
.btn-submit:active{transform:scale(.97);}
.btn-submit:disabled{background:var(--gray400);cursor:not-allowed;transform:none;}

/* ─── TOAST ─── */
.toast{
  position:fixed;bottom:32px;left:50%;
  transform:translateX(-50%) translateY(80px);
  background:var(--p800);color:white;
  padding:12px 24px;border-radius:24px;
  font-size:13px;font-weight:500;z-index:600;
  transition:transform .35s ease,opacity .35s ease;
  opacity:0;white-space:nowrap;box-shadow:0 8px 32px rgba(0,0,0,.2);
}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1;}

/* ─── SKELETON LOADER ─── */
.skel{
  background:linear-gradient(90deg,var(--gray100) 25%,var(--gray50) 50%,var(--gray100) 75%);
  background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:6px;
}
@keyframes shimmer{0%{background-position:200% 0;}100%{background-position:-200% 0;}}

/* ═══════════════ RESPONSIVE ═══════════════ */

/* 平板 (≤900px) */
@media(max-width:900px){
  .main{grid-template-columns:1fr;}
  .sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:12px;}
  .hero-inner{grid-template-columns:1fr;}
  .hero-right{display:none;}
}

/* 手机 (≤640px) */
@media(max-width:640px){
  .topbar{display:none;}
  .hamburger{display:flex;}
  .nav-right .btn-post{display:none;}
  .nav-brand{margin-right:auto;}
  .nav-title-en{display:none;}
  .nav-icon-btn{display:none;}
  .sidebar{grid-template-columns:1fr;}
  .hero{padding:24px 16px 28px;}
  .cat-strip{padding:0 12px;}
  .main{padding:16px;}
  .hero-stats{gap:20px;}
  .post-card{padding:16px 16px;}
}

/* 智能白板 (≥1400px) */
@media(min-width:1400px){
  .main{max-width:1400px;grid-template-columns:1fr 360px;}
  .hero-inner{max-width:1400px;}
  .topbar,.nav,.cat-strip{padding-left:clamp(48px,6vw,80px);padding-right:clamp(48px,6vw,80px);}
  .hero{padding:80px clamp(48px,6vw,80px);}
  .main{padding:40px clamp(48px,6vw,80px);}
  .post-card{padding:24px 26px;}
  .post-content{font-size:15px;}
}