/* ══════════════════════════════════════════
   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;
  /* 热度专用色：带紫底的暖红，与整体 ink 系气质一致 */
  --heat:#C0392B;
  --heat-mid:#E8503A;
  --heat-bg:#FDF1EF;
  --heat-border:#F5C9C2;
}

html{scroll-behavior:smooth;}

/* iOS Safari: 支持安全区域变量 */
@supports(padding: max(0px)) {
  body { padding-bottom: env(safe-area-inset-bottom); }
}

body{
  font-family:'Noto Sans SC',sans-serif;
  background:var(--gray50);
  color:var(--ink);
  min-height:100vh;
  min-height:-webkit-fill-available;
  -webkit-font-smoothing:antialiased;
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  overflow-x:hidden;
}

/* ─── 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:-webkit-sticky;
  position:sticky;top:0;z-index:200;
  display:flex;align-items:center;
  height:60px;
  padding:0 clamp(16px,4vw,48px);
  -webkit-transform:translateZ(0);
  transform:translateZ(0);
  /* 状态栏安全区域：防止滚动时系统状态栏遮住 nav 内容 */
  padding-top:env(safe-area-inset-top, 0px);
  height:calc(60px + env(safe-area-inset-top, 0px));
  box-sizing:border-box;
}
.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);}
/* ─── 加载更多按钮（精致校园风） ─── */
.btn-load-more {
  padding: 11px 36px;
  background: var(--white);
  border: 1px solid var(--p200);
  color: var(--p600);
  border-radius: 24px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: 'Noto Sans SC', sans-serif;
  box-shadow: 0 2px 8px rgba(91, 45, 142, 0.04);
}

.btn-load-more:hover {
  background: var(--p50);
  color: var(--p700);
  border-color: var(--p300);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(91, 45, 142, 0.08);
}

.btn-load-more:active {
  transform: translateY(0) scale(0.98);
}

/* ─── 桌面/移动端显示切换 ─── */
.nav-mobile         { display: none; }   /* 默认隐藏，手机 media query 内覆盖 */
.nav-desktop        { display: flex; }
.nav-login-desktop  { display: flex; }
.mobile-only-btn    { display: none; }
.desktop-only-btn   { display: flex; }

/* ─── FEED 搜索框 ─── */
.feed-search-wrap {
  margin: 0 0 16px 0;
  width: 100%;
  box-sizing: border-box;
}
.feed-search-inner {
  position: relative;
  display: flex;
  align-items: center;
  background: rgba(200, 180, 240, 0.18);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  border: 1.5px solid rgba(180, 140, 230, 0.32);
  border-radius: 20px;
  padding: 0 16px;
  height: 46px;
  transition: border-color .25s, box-shadow .25s, background .25s;
  box-shadow: 0 2px 16px rgba(155, 95, 212, 0.08), inset 0 1px 0 rgba(255,255,255,0.55);
}
.feed-search-inner:focus-within {
  border-color: rgba(155, 95, 212, 0.55);
  background: rgba(210, 190, 248, 0.26);
  box-shadow: 0 4px 24px rgba(155, 95, 212, 0.14), inset 0 1px 0 rgba(255,255,255,0.7);
}
.feed-search-icon {
  color: var(--p400);
  flex-shrink: 0;
  margin-right: 10px;
  opacity: 0.75;
  pointer-events: none;
}
.feed-search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  letter-spacing: .2px;
}
.feed-search-input::placeholder {
  color: rgba(91, 45, 142, 0.38);
  font-weight: 400;
}
.feed-search-clear {
  display: none;
  align-items: center;
  justify-content: center;
  width: 24px; height: 24px;
  border: none; background: rgba(155, 95, 212, 0.12);
  border-radius: 50%; cursor: pointer;
  color: var(--p500); margin-left: 6px; flex-shrink: 0;
  transition: background .18s;
}
.feed-search-clear:hover { background: rgba(155, 95, 212, 0.22); }
.feed-search-clear.visible { display: flex; }

/* ─── 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;
  padding-bottom:max(20px, env(safe-area-inset-bottom));
  flex-direction:column;gap:4px;
  border-top:1px solid var(--p100);overflow-y:auto;
  -webkit-overflow-scrolling:touch;
}
.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);
  -webkit-backdrop-filter:blur(12px);
  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;
  /* iOS Safari: 防止和 sticky nav 冲突导致层叠错误 */
  position:relative;
  z-index:100;
}
.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;
  box-sizing:border-box;
  width:100%;
}

/* feed 列防溢出 */
.feed {
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

/* ─── FEED HEADER ─── */
.feed-header{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:16px;
  width:100%;
  box-sizing:border-box;
  min-width:0;
}
.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;
  -webkit-tap-highlight-color:transparent; /* 去掉 iOS 点击高亮 */
}
.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;
  min-width:0; /* ✨ 新增：打破底层默认最小内容宽度限制，防止撑开父级 */
  border:1px solid var(--gray200);border-radius:20px;padding:7px 14px;
  font-size:16px; /* 防止 iOS 自动缩放 */
  font-family:'Noto Sans SC',sans-serif;
  outline:none;color:var(--ink);background:var(--gray50);transition:border .2s;
  -webkit-appearance:none;
  appearance:none;
}
.c-input:focus{border-color:var(--p400);background:white;}
.c-send{
  flex-shrink:0; /* ✨ 新增：强制发送按钮绝不收缩，死守自身宽度 */
  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;
  background:var(--p50);
  border:1px solid var(--p100);
  border-radius:24px;
  padding:12px;
}
.sidebar-card{
  background:var(--white);border:1px solid var(--gray200);
  border-radius:20px;overflow:hidden;margin-bottom:12px;
}
.sidebar > *:last-child{margin-bottom:0;}
.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;}

/* ─── 热力值徽章 ─── */
.heat-score{
  display:inline-flex;align-items:center;gap:3px;
  font-size:11px;font-weight:800;white-space:nowrap;
  color:var(--heat);
  background:var(--heat-bg);
  border:1px solid var(--heat-border);
  border-radius:8px;
  padding:2px 7px 2px 5px;
  flex-shrink:0;
  letter-spacing:.3px;
  transition:background .2s, border-color .2s, color .2s;
}
.leader-item:hover .heat-score{
  background:#FCEAE7;
  border-color:#EDA89F;
  color:var(--heat);
}
.heat-icon{
  width:9px;height:11px;
  color:var(--heat-mid);
  flex-shrink:0;
  position:relative;top:0.5px;
}

/* ─── MODALS ─── */
.modal-overlay{
  position:fixed;
  top:0;right:0;bottom:0;left:0; /* inset:0 的兼容写法，iOS 13 以下不支持 inset */
  background:rgba(20,5,50,.55);
  z-index:500;display:none;align-items:flex-end;justify-content:center;
  -webkit-backdrop-filter:blur(4px);
  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;
  max-height:90dvh; /* 动态视口高度，iOS 15+ 支持，修复地址栏导致的遮挡 */
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  padding:24px;
  padding-bottom:max(24px, env(safe-area-inset-bottom)); /* iOS Home Bar 安全区 */
  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:16px; /* iOS Safari 要求输入框 font-size >= 16px，否则触发页面缩放 */
  color:var(--ink);outline:none;transition:border .2s;margin-bottom:12px;
  -webkit-appearance:none; /* 去掉 iOS 默认输入框样式 */
  appearance:none;
}
.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:16px; /* 同上，防止 iOS 缩放 */
  color:var(--ink);min-height:120px;resize:none;outline:none;
  transition:border .2s;margin-bottom:12px;
  -webkit-appearance:none;
  appearance:none;
}
.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%;
  bottom:max(32px, calc(env(safe-area-inset-bottom) + 16px)); /* 避免被 iOS Home Bar 遮挡 */
  -webkit-transform:translateX(-50%) translateY(80px);
  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;
  -webkit-transition:-webkit-transform .35s ease,opacity .35s ease;
  transition:transform .35s ease,opacity .35s ease;
  opacity:0;white-space:nowrap;box-shadow:0 8px 32px rgba(0,0,0,.2);
  /* iOS 上触发 GPU 合成层，防止 transform 动画卡顿 */
  -webkit-backface-visibility:hidden;
  backface-visibility:hidden;
}
.toast.show{
  -webkit-transform:translateX(-50%) translateY(0);
  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 容器防溢出 ── */
  .nav-brand { margin-right: auto; flex-shrink: 0; }
  .nav-title-en { display: none; }
  .nav-right { gap: 2px; flex-shrink: 0; }

  /* ── 桌面专属隐藏 ── */
  .nav-desktop       { display: none; }
  .nav-login-desktop { display: none; }

  /* ── 移动端专属显示 ── */
  .nav-mobile { display: flex; }

  /* ── 布局 ── */
  .sidebar { grid-template-columns: 1fr; }
  .hero { padding: 24px 16px 28px; }
  .cat-strip { padding: 0 12px; }
  .main { padding: 16px; grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .post-card { padding: 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;}
}
/* ─── 个人主页 ─── */
.profile-wrap {
  max-width: 720px;
  margin: 40px auto;
  padding: 0 clamp(16px, 4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.profile-card {
  background: var(--white);
  border-radius: 20px;
  border: 1px solid var(--p200);
  padding: 32px;
}

.profile-loading {
  display: flex;
  gap: 6px;
  justify-content: center;
  padding: 20px 0;
}

.profile-avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--p500);
  color: white;
  font-size: 28px;
  font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.profile-info {
  display: flex;
  align-items: center;
  gap: 20px;
}

.profile-info-text {
  flex: 1;
}

.profile-nickname {
  font-size: 22px;
  font-weight: 900;
  color: var(--ink);
  margin-bottom: 4px;
}

.profile-uid {
  font-size: 13px;
  color: var(--gray400);
  letter-spacing: .5px;
}

.profile-role-badge {
  display: inline-block;
  margin-top: 6px;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 20px;
  background: var(--p100);
  color: var(--p600);
  font-weight: 700;
}

.profile-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--gray100);
}

.profile-posts-section {
  background: var(--white);
  border-radius: 20px;
  border: 1px solid var(--p200);
  padding: 24px;
}

.profile-posts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.profile-posts-count {
  font-size: 13px;
  color: var(--gray400);
}

.post-author-link {
  display: flex;
  align-items: center;
  gap: inherit;
  text-decoration: none;
  color: inherit;
}
.post-author-link:hover .post-author {
  text-decoration: underline;
}

/* ══════════════════════════════════════════
   自定义确认弹窗 · confirm-modal
   ══════════════════════════════════════════ */
.confirm-overlay {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0; /* iOS 13 以下不支持 inset */
  background: rgba(0,0,0,.45);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  -webkit-transition: opacity .2s ease;
  transition: opacity .2s ease;
}
.confirm-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.confirm-box {
  background: #fff;
  border-radius: 20px;
  padding: 28px 28px 22px;
  width: min(340px, 90vw);
  box-shadow: 0 20px 60px rgba(91,45,142,.18), 0 4px 16px rgba(0,0,0,.08);
  -webkit-transform: translateY(12px) scale(.97);
  transform: translateY(12px) scale(.97);
  -webkit-transition: -webkit-transform .22s cubic-bezier(.34,1.56,.64,1);
  transition: transform .22s cubic-bezier(.34,1.56,.64,1);
  text-align: center;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.confirm-overlay.open .confirm-box {
  -webkit-transform: translateY(0) scale(1);
  transform: translateY(0) scale(1);
}
.confirm-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 22px;
}
.confirm-icon.danger  { background: #FEE2E2; }
.confirm-icon.warning { background: #FEF3C7; }
.confirm-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--gray900, #1a1a2e);
  margin-bottom: 6px;
}
.confirm-msg {
  font-size: 13px;
  color: var(--gray500, #6b7280);
  line-height: 1.7;
  margin-bottom: 22px;
}
.confirm-btns {
  display: flex;
  gap: 10px;
}
.confirm-btn {
  flex: 1;
  padding: 11px 0;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: opacity .15s, transform .15s;
}
.confirm-btn:active { transform: scale(.97); opacity: .85; }
.confirm-btn.cancel {
  background: var(--gray100, #f3f4f6);
  color: var(--gray600, #4b5563);
}
.confirm-btn.cancel:hover { background: var(--gray200, #e5e7eb); }
.confirm-btn.ok-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
}
.confirm-btn.ok-danger:hover { opacity: .9; }
.confirm-btn.ok-warning {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
}
.confirm-btn.ok-warning:hover { opacity: .9; }

/* ══════════════════════════════════════════
   靓号专属 UI：用户名斜体渐变与主页气泡
   ══════════════════════════════════════════ */

/* 1. 帖子/评论区用户名特效 */
.username-text[class*="tier-"] {
  font-style: italic;
  font-weight: 900;
  
  /* ── 核心：文本渐变与兼容性 ── */
  color: transparent;
  -webkit-text-fill-color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
  
  /* ── 布局：防止错位与切边 ── */
  display: inline-block;
  vertical-align: baseline;
  
  /* iOS Safari 斜体切边修复：需要比 desktop 更大的 padding */
  padding-right: 6px; 
  margin-right: -6px;
  /* 防止 iOS 上 overflow:hidden 裁切渐变 */
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* 稀有度颜色阶梯 (作用于文本) */
.username-text.tier-admin { background-image: linear-gradient(135deg, #8B00FF, #FF007F); } /* 管理组：深邃紫红 */
.username-text.tier-ssr   { background-image: linear-gradient(135deg, #FF9900, #FFD700); } /* SSR：至尊金 */
.username-text.tier-sr    { background-image: linear-gradient(135deg, #74EBD5, #9FACE6); } /* SR：冰川银紫 */
.username-text.tier-r     { background-image: linear-gradient(135deg, #5C7080, #8A9CA8); } /* R：莫兰迪蓝灰 (调暗调柔和) */

/* 2. 个人主页 ID 气泡特效 */
.id-bubble {
  display: inline-flex;      /* 改为 flex 方便对齐文字和图标 */
  align-items: center;       /* 垂直居中 */
  padding: 4px 14px 4px 6px; /* 左侧留距调小，给图标留位置 */
  border-radius: 20px;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 1px;
  transition: transform 0.2s ease;
}

.id-bubble:hover {
  transform: translateY(-2px);
}

/* =========================================
   新增：斜体带炫彩的“靓”字标识
   ========================================= */
.premium-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #FFFFFF; /* 纯白底色托底，保证在任何气泡中都亮眼 */
  border-radius: 14px;
  padding: 1px 6px;
  margin-right: 6px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.12); /* 淡淡阴影，使其更立体 */
}

.premium-icon i {
  font-style: italic;
  font-weight: 900;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 13px;
  line-height: 1.2;
  
  /* 炫彩渐变：粉红 -> 金黄 -> 亮青 */
  background: linear-gradient(135deg, #FF007F 0%, #FFD700 50%, #00F2FE 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  
  /* iOS Safari 斜体不被裁切 */
  padding-right: 3px;
  display: inline-block; /* iOS 需要 block 级别才能正确 background-clip */
}

/* 稀有度颜色阶梯 (作用于气泡背景) */
/* ... 保留你原有的 .tier-admin, .tier-ssr 等样式即可 ... */

/* 稀有度颜色阶梯 (作用于气泡背景) */
.id-bubble.tier-admin { 
  background: linear-gradient(135deg, #4A00E0, #8E2DE2); color: #fff; 
  box-shadow: 0 4px 12px rgba(142, 45, 226, 0.3);
}
.id-bubble.tier-ssr { 
  background: linear-gradient(135deg, #F2994A, #F2C94C); color: #fff; 
  box-shadow: 0 4px 12px rgba(242, 153, 74, 0.4);
}
.id-bubble.tier-sr { 
  background: linear-gradient(135deg, #8E9EAB, #EEF2F3); color: #333; /* 银色配深灰字更显质感 */
  box-shadow: 0 4px 10px rgba(142, 158, 171, 0.3);
}
.id-bubble.tier-r { 
  background: linear-gradient(135deg, #64748B, #94A3B8); color: #fff; /* 柔和暗色雾霾蓝 */
  box-shadow: 0 4px 8px rgba(100, 116, 139, 0.2);
}

/* ══════════════════════════════════════════
   桌面端独立滑动修复（≥901px）
   左侧信息流和上方Hero正常滑动，右侧边栏吸顶并内部独立滑动
   ══════════════════════════════════════════ */
@media(min-width:901px){
  /* 恢复网页全局自然滚动 */
  html, body {
    height: auto;
    overflow: visible;
  }

  /* 左侧边栏：吸顶悬浮 + 内部独立滚动，与主页面互不影响 */
  .sidebar {
    position: sticky;
    top: 76px; /* 停住的位置在顶部导航栏下方 */
    height: calc(100vh - 90px); /* 限制最高只能占满剩余屏幕，为内部滚动创造条件 */
    overflow-y: auto; /* 侧边栏内部独立滑动 */
    overscroll-behavior: contain; /* 关键：滚动到边界后不再向主页面传递滚动事件 */
    scrollbar-width: none;
  }

  /* 隐藏左侧独立的滚动条，保持 App 般的干净视觉 */
  .sidebar::-webkit-scrollbar { display: none; }
}

/* ══════════════════════════════════════════
   校园主页引流卡片专属样式
   ══════════════════════════════════════════ */
.campus-redirect-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background: var(--p900);
}
.campus-redirect-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(26, 11, 53, 0.2);
}
.campus-card-bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  opacity: 0.72;
}
.campus-redirect-card:hover .campus-card-bg { transform: scale(1.06); }
.campus-card-overlay {
  position: relative;
  z-index: 2;
  padding: 44px 16px 16px;
  background: linear-gradient(to top, rgba(26, 11, 53, 0.98) 0%, rgba(26, 11, 53, 0.4) 65%, transparent 100%);
  color: var(--white);
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.campus-card-title {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}
.campus-card-subtitle {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 7px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
.campus-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--white);
  background: rgba(255, 255, 255, 0.15);
  padding: 5px 12px;
  border-radius: 20px;
  width: fit-content;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: all 0.2s ease;
}
.campus-redirect-card:hover .campus-card-btn {
  background: var(--p600);
  border-color: var(--p400);
  box-shadow: 0 4px 12px rgba(91, 45, 142, 0.3);
}
.campus-redirect-card.desktop-card { margin-top: 12px; aspect-ratio: 16 / 10; width: 100%; }
.campus-redirect-card.mobile-card { margin-top: auto; aspect-ratio: 16 / 9; width: 100%; margin-bottom: 20px;}