/* ============================================================
   校园之声 · 学生反馈平台  公共端样式
   设计语言：年轻不失正式 · 机构感 · 单一青色强调 · 温暖纸白底
   ============================================================ */

:root{
  /* 色板 - 单一强调 + 中性 */
  --ink:#0c1b21;
  --ink-2:#55686e;
  --ink-3:#8a9aa0;

  --brand:#0e7a68;          /* 主色 · 深青 */
  --brand-600:#09584c;
  --brand-700:#074439;
  --brand-50:#ecf6f2;

  --accent:#ff5a3d;         /* 珊瑚 · 极小面积点缀 */

  --amber:#d9912b;
  --paper:#f7f6f2;          /* 暖纸白底 */
  --surface:#ffffff;
  --line:#e9e7e0;
  --line-soft:#f1efea;

  /* 形状系统 (规则统一) */
  --r-card:14px;
  --r-input:10px;
  --r-pill:999px;

  /* 阴影 - 调制到背景色相 */
  --sh-1:0 1px 2px rgba(12,27,33,.05), 0 10px 30px -18px rgba(12,27,33,.18);
  --sh-2:0 2px 4px rgba(12,27,33,.05), 0 28px 60px -30px rgba(12,27,33,.30);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
::selection{background:var(--brand);color:#fff}

.container{max-width:1160px;margin:0 auto;padding:0 22px}

/* ------- 顶部导航 ------- */
.site-header{
  position:sticky;top:0;z-index:40;
  height:64px;
  background:rgba(247,246,242,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{height:64px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:11px}
.brand-mark{
  width:34px;height:34px;border-radius:11px;
  background:var(--brand);
  display:grid;place-items:center;
  color:#fff;
}
.brand-name{font-weight:700;font-size:17px;letter-spacing:.2px}
.brand-name em{font-style:normal;color:var(--brand)}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-link{
  font-size:14px;color:var(--ink-2);font-weight:500;
  padding:8px 12px;border-radius:9px;transition:background .2s,color .2s;
}
.nav-link:hover{background:rgba(14,122,104,.08);color:var(--brand)}
/* 移动端汉堡按钮 */
.mb-toggle{display:none;flex:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:12px;cursor:pointer;padding:11px}
.mb-toggle span{display:block;height:2.5px;width:100%;background:var(--ink);border-radius:2px;transition:transform .22s,opacity .18s}
.mb-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.mb-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.mb-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ------- 按钮 ------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14.5px;font-weight:600;line-height:1;
  padding:12px 22px;border-radius:var(--r-pill);
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease,box-shadow .2s,background .2s,border-color .2s,color .2s;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px) scale(.985)}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-600);box-shadow:0 12px 26px -14px var(--brand);}
.btn-secondary{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-secondary:hover{border-color:var(--brand);color:var(--brand)}
.btn-ghost{background:transparent;color:var(--brand);font-weight:600;padding:12px 16px}
.btn-ghost:hover{background:rgba(14,122,104,.08)}

/* ------- Hero ------- */
.hero{
  position:relative;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(900px 420px at 88% -8%, rgba(14,122,104,.14), transparent 60%),
    radial-gradient(700px 380px at -8% 8%, rgba(14,122,104,.07), transparent 55%),
    var(--paper);
}
.hero-inner{
  min-height:min(560px,calc(100dvh - 64px));
  display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;
  padding:48px 0 60px;
}
.hero-copy .kicker{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--brand);
  background:var(--brand-50);border:1px solid rgba(14,122,104,.14);
  padding:7px 13px;border-radius:var(--r-pill);
}
.hero-copy h1{
  font-size:clamp(36px,5vw,58px);line-height:1.04;letter-spacing:-.02em;
  margin:22px 0 20px;font-weight:800;
}
.hero-copy h1 .hl{position:relative;color:var(--brand);white-space:nowrap}
.hero-copy h1 .hl::after{
  content:"";position:absolute;left:0;right:0;bottom:.02em;height:.14em;
  background:rgba(14,122,104,.20);z-index:-1;border-radius:2px;
}
.hero-copy p.lead{
  font-size:16.5px;line-height:1.7;color:var(--ink-2);
  max-width:46ch;margin:0 0 30px;
}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.privacy-note{
  margin-top:26px;display:flex;align-items:center;gap:10px;
  font-size:13.5px;color:var(--ink-3);
}
.circle-check{
  width:20px;height:20px;border-radius:50%;flex:none;
  background:rgba(14,122,104,.12);color:var(--brand);
  display:grid;place-items:center;font-size:12px;
}

/* Hero 右侧 · 实时信息卡 */
.hero-visual{position:relative}
.live-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;
  box-shadow:var(--sh-2);padding:26px 26px 22px;position:relative;overflow:hidden;
}
.live-card::before{
  content:"";position:absolute;inset:0;height:5px;
  background:linear-gradient(90deg,var(--brand),rgba(14,122,104,.35));
}
.live-card .lc-head{display:flex;align-items:center;gap:10px;margin-bottom:20px}
.live-dot{width:9px;height:9px;border-radius:50%;background:var(--brand);position:relative}
.live-dot::after{
  content:"";position:absolute;inset:-4px;border-radius:50%;
  border:2px solid rgba(14,122,104,.35);animation:pulse 2.2s infinite;
}
@keyframes pulse{0%,100%{opacity:.7;transform:scale(.8)}50%{opacity:0;transform:scale(1.3)}}
.live-card .lc-head b{font-size:14px;font-weight:700}
.live-card .lc-head span{margin-left:auto;font-size:12.5px;color:var(--ink-3)}
.live-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.live-stat{
  background:var(--paper);border:1px solid var(--line-soft);
  border-radius:14px;padding:16px 14px;text-align:center;
}
.live-stat .num{font-size:28px;font-weight:800;color:var(--brand);font-variant-numeric:tabular-nums}
.live-stat .lbl{font-size:12.5px;color:var(--ink-3);margin-top:4px}
.live-tape{
  margin-top:16px;display:flex;align-items:center;gap:9px;
  padding:12px 14px;border-top:1px dashed var(--line);
  font-size:13px;color:var(--ink-2);
}
.live-tape .tl{font-size:12.5px;font-weight:700;color:var(--brand);flex:none}

@media(max-width:920px){
  .hero-inner{grid-template-columns:1fr;gap:34px;padding-top:44px;min-height:0}
  .live-card{max-width:480px}
}

/* ------- 区块通用 ------- */
.section{padding:72px 0}
.section-tight{padding:56px 0}
.section-head{max-width:60ch;margin-bottom:32px}
.section-head h2{font-size:clamp(26px,3.4vw,34px);letter-spacing:-.015em;margin:0 0 12px;font-weight:800}
.section-head p{font-size:15.5px;line-height:1.7;color:var(--ink-2);margin:0}

/* ------- 功能分布 3 格 (非等卡，用分隔线体系) ------- */
.steps{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0;border-top:1px solid var(--line)}
.step{
  padding:34px 30px 30px;position:relative;border-right:1px solid var(--line);
}
.step:last-child{border-right:0}
.step .step-no{
  font-size:13px;font-weight:800;color:#fff;background:var(--brand);
  width:30px;height:30px;border-radius:10px;display:grid;place-items:center;margin-bottom:18px;
}
.step h3{font-size:18px;margin:0 0 10px;font-weight:700}
.step h3 var{font-style:normal;color:var(--brand)}
.step p{font-size:14.5px;line-height:1.65;color:var(--ink-2);margin:0}
@media(max-width:760px){
  .steps{grid-template-columns:1fr;border-top:1px solid var(--line)}
  .step{border-right:0;border-bottom:1px solid var(--line)}
  .step:last-child{border-bottom:0}
}

/* ------- 提交表单 ------- */
.form-shell{
  background:#fff;border:1px solid var(--line);border-radius:22px;
  box-shadow:var(--sh-1);overflow:hidden;
}
.form-head{
  padding:26px 30px;border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:14px;
}
.form-head .fh-icon{
  width:44px;height:44px;border-radius:13px;background:var(--brand-50);color:var(--brand);
  display:grid;place-items:center;flex:none;
}
.form-head h3{margin:0;font-size:19px;font-weight:800}
.form-head p{margin:3px 0 0;font-size:13.5px;color:var(--ink-3)}
.form-body{padding:28px 30px 32px;display:grid;gap:24px}

.field label{display:block;font-size:14px;font-weight:600;margin-bottom:11px}
.field label .req{color:var(--accent)}
.field .hint{font-size:12.5px;color:var(--ink-3);font-weight:400}

/* 分类选择 chip */
.cats{display:flex;flex-wrap:wrap;gap:10px}
.cat-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:var(--r-pill);
  border:1.5px solid var(--line);background:#fff;
  font-size:14px;font-weight:600;color:var(--ink-2);cursor:pointer;
  transition:all .18s;
}
.cat-chip i{width:8px;height:8px;border-radius:3px;background:var(--line)}
.cat-chip:hover{border-color:var(--brand);color:var(--brand)}
.cat-chip input{position:absolute;opacity:0;pointer-events:none}
.cat-chip:has(input:checked){border-color:var(--brand);background:var(--brand-50);color:var(--brand)}
.cat-chip:has(input:checked) i{background:var(--brand)}

/* 输入与文本域 */
.input,.textarea{
  width:100%;border:1.5px solid var(--line);border-radius:var(--r-input);
  padding:13px 15px;font-size:15px;color:var(--ink);background:#fff;
  font-family:inherit;transition:border-color .18s,box-shadow .18s;
}
.input:focus,.textarea:focus{
  outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(14,122,104,.12);
}
.textarea{min-height:150px;resize:vertical;line-height:1.65}
.placeholder\:text-2::placeholder{color:var(--ink-3)}

/* 标题 + 详情行 */
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:640px){.row-2{grid-template-columns:1fr}}

.form-foot{
  margin-top:6px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.anon-tip{display:flex;gap:11px;align-items:flex-start;font-size:13px;color:var(--ink-3);line-height:1.6;max-width:42ch}
.anon-tip .faber{flex:none;width:22px;height:22px;border-radius:8px;background:rgba(14,122,104,.12);color:var(--brand);display:grid;place-items:center;font-size:13px}

/* 提交成功 / 结果卡 */
.result-card{border-radius:20px;border:1px solid var(--line);overflow:hidden;background:#fff;box-shadow:var(--sh-1)}
.result-hero{background:linear-gradient(135deg,var(--brand),var(--brand-700));color:#fff;padding:34px 30px;text-align:center}
.result-hero .tk-check{
  width:54px;height:54px;border-radius:50%;margin:0 auto 16px;
  background:rgba(255,255,255,.2);display:grid;place-items:center;font-size:26px;
}
.result-hero h3{margin:0 0 8px;font-size:22px;font-weight:800}
.result-hero p{margin:0;font-size:14.5px;opacity:.9}
.result-grid{padding:28px 30px;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.result-item{border:1px solid var(--line);border-radius:14px;padding:18px;background:var(--paper)}
.result-item .rk{font-size:12.5px;color:var(--ink-3);font-weight:600;margin-bottom:8px}
.result-item .rv{font-size:22px;font-weight:800;color:var(--brand);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.result-item .rv small{font-size:12px;color:var(--ink-3);font-weight:500}
.result-note{padding:0 30px 28px;font-size:13.5px;color:var(--ink-2);line-height:1.7;text-align:center}
@media(max-width:640px){.result-grid{grid-template-columns:1fr}}

/* ------- 最近动态 / 反馈列表 ------- */
.feed{display:grid;gap:14px}
.feed-filter{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end;margin-bottom:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:14px 16px}
.ff-item{display:flex;flex-direction:column;gap:6px}
.ff-item span{font-size:12px;font-weight:700;color:var(--ink-3)}
.ff-item select{font-family:inherit;font-size:14px;color:var(--ink);background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:9px 12px;padding-right:30px;cursor:pointer;transition:border-color .18s}
.ff-item select:focus{outline:none;border-color:var(--brand)}
.feed-refresh{margin-left:auto;flex:none;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:1.5px solid var(--line);background:#fff;border-radius:12px;color:var(--brand);cursor:pointer;transition:color .18s,background .18s,border-color .18s,transform .3s}
.feed-refresh:hover{border-color:var(--brand);background:var(--brand-50)}
.feed-refresh:active{transform:scale(.94)}
.feed-refresh.loading svg{animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.feed-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:20px 22px;display:flex;gap:18px;align-items:flex-start;
  transition:border-color .18s,box-shadow .18s;
}
.feed-item:hover{border-color:rgba(14,122,104,.4);box-shadow:var(--sh-1)}
.feed-icon{
  flex:none;width:46px;height:46px;border-radius:13px;
  background:var(--brand-50);color:var(--brand);display:grid;place-items:center;
}
.feed-main{flex:1;min-width:0}
.feed-top{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.feed-cat{font-size:13px;font-weight:700;color:var(--brand)}
.feed-tk{font-size:13px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.feed-time{margin-left:auto;font-size:12.5px;color:var(--ink-3)}
.feed-title{font-size:15.5px;font-weight:700;margin:8px 0 5px}
.feed-content{font-size:14px;color:var(--ink-2);line-height:1.65;margin:0}
.feed-max2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 官方回复（管理员公开留言） */
.reply-group{margin-top:10px;display:grid;gap:8px}
.feed-reply{
  background:var(--brand-50);border:1px solid rgba(14,122,104,.22);border-radius:12px;
  padding:10px 13px;margin-top:10px;
}
.fr-label{font-size:12.5px;font-weight:700;color:var(--brand);margin-bottom:4px}
.fr-text{font-size:13.8px;line-height:1.6;color:var(--ink);white-space:pre-wrap;word-break:break-word}
.fr-time{margin-top:5px;font-size:11.5px;color:var(--ink-3)}

/* 状态徽章 */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:var(--r-pill);
}
.badge .bdot{width:6px;height:6px;border-radius:50%}
.badge.pending{background:rgba(255,90,61,.12);color:var(--accent)}
.badge.pending .bdot{background:var(--accent)}
.badge.processing{background:rgba(217,145,43,.14);color:#b4761d}
.badge.processing .bdot{background:var(--amber)}
.badge.resolved{background:rgba(14,122,104,.12);color:var(--brand)}
.badge.resolved .bdot{background:var(--brand)}

/* 空状态 */
.empty{
  text-align:center;padding:48px 20px;color:var(--ink-3);
  border:1.5px dashed var(--line);border-radius:18px;
}

/* ------- 查询工单 ------- */
.track-shell{display:flex;gap:12px;max-width:560px}
.track-shell .input{flex:1}
.track-shell .btn{padding:13px 26px}

/* ------- 页脚 ------- */
.site-footer{border-top:1px solid var(--line);padding:46px 0 40px;background:#fff}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
.footer-col h4{font-size:13px;letter-spacing:.05em;color:var(--ink-3);text-transform:uppercase;margin:0 0 14px;font-weight:700}
.footer-col p,.footer-col li{font-size:14px;color:var(--ink-2);line-height:1.7;margin:0}
.footer-col ul{list-style:none;padding:0;margin:0;display:grid;gap:9px}
.footer-bottom{
  margin-top:40px;padding-top:22px;border-top:1px solid var(--line-soft);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:var(--ink-3);
}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr;gap:28px}}

/* 提示条 */
.alert{border-radius:12px;padding:13px 16px;font-size:14px;display:flex;gap:10px;align-items:flex-start;line-height:1.6}
.alert.err{background:rgba(255,90,61,.1);color:#c23a1f;border:1px solid rgba(255,90,61,.25)}
.alert.ok{background:var(--brand-50);color:var(--brand-600);border:1px solid rgba(14,122,104,.22)}

/* 骨架加载 */
.skeleton{
  border-radius:8px;background:linear-gradient(90deg,var(--line-soft),#f5f4f0,var(--line-soft));
  background-size:200% 100%;animation:shimmer 1.4s infinite;
}
@keyframes shimmer{to{background-position:-200% 0}}

/* 减少动效 */
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
}

/* 淡入上移 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.16,1,.3,1),transform .6s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ================= 手机端画面 (< 720px) ================= */
@media (max-width:720px){
  .container{padding:0 16px}
  .nav-inner{height:58px}
  .site-header{height:auto}
  .brand-name{font-size:15.5px}

  /* 汉堡显示，桌面导航转为下拉面板 */
  .mb-toggle{display:flex}
  .nav-actions{
    position:fixed;top:58px;left:0;right:0;z-index:39;
    display:none;flex-direction:column;align-items:stretch;gap:4px;
    background:rgba(247,246,242,.97);backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    padding:12px 16px 18px;border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -24px rgba(10,30,22,.35);
    max-height:calc(100dvh - 58px);overflow:auto;
  }
  .nav-actions.open{display:flex}
  .nav-actions .nav-link{font-size:15px;padding:13px 14px;border-radius:12px}
  .nav-actions .nav-link:hover{background:var(--brand-50)}
  .nav-cta{margin-top:6px;width:100%}

  .hero-inner{min-height:0;padding:38px 0 46px;gap:30px}
  .hero-copy h1{font-size:clamp(30px,8.6vw,38px)}
  .hero-copy h1 .hl{white-space:normal} /* 避免高亮短语 nowrap 撑破 */
  .hero-cta{gap:10px}
  .hero-cta .btn{flex:1 1 0;min-width:0;padding:14px 16px;overflow-wrap:break-word}

  /* 移动端收紧 Hero 垂直间距，避免堆叠拥挤 */
  .hero-copy .kicker{font-size:11.5px;padding:6px 12px;gap:7px}
  .hero-copy h1{margin:16px 0 14px;line-height:1.12}
  .hero-copy p.lead{margin:0 0 22px;line-height:1.62}
  .privacy-note{margin-top:18px;gap:8px;font-size:12.5px;align-items:flex-start}
  .privacy-note .circle-check{width:18px;height:18px;font-size:11px;margin-top:1px}

  .live-tape{flex-wrap:wrap}
  .live-stats{gap:8px}
  .live-stat{padding:14px 10px}
  .live-stat .num{font-size:24px}

  .section{padding:50px 0}
  .section-tight{padding:42px 0}
  .section-head{margin-bottom:26px}
  .section-head h2{font-size:24px}
  .section-head p{font-size:14.5px}

  .form-head{flex-direction:row;gap:12px;padding:20px}
  .form-body{padding:22px 20px 26px;gap:20px}
  .form-head h3{font-size:17px}
  .cat-chip{padding:11px 15px;font-size:13px}
  .form-foot{flex-direction:column;align-items:stretch;gap:14px}
  .anon-tip{max-width:none}

  /* 反馈表单/文本：窄屏强制不外溢 */
  .form-shell,.form-body,.form-body .field,.form-body .input,.form-body .textarea,
  .feed-main,.feed-title,.feed-content,.feed-reply,.feed-top,
  .cats,.cat-chip{min-width:0;max-width:100%;overflow-wrap:anywhere;word-break:break-word}
  .cats{gap:8px}
  .cat-chip{flex:0 1 auto}
  .feed-content,.fr-text,.feed-title{-webkit-line-clamp:none;display:block;white-space:normal}

  .hero-copy p.lead{font-size:15.5px}
  .privacy-note{flex-wrap:wrap}

  .feed-filter{padding:14px;gap:10px;flex-direction:column;align-items:stretch}
  .ff-item{width:100%}
  .ff-item select{width:100%}
  .feed-refresh{margin-left:auto;margin-right:0;align-self:flex-end}
  .feed-item{padding:16px;gap:13px}
  .feed-item .feed-icon{width:40px;height:40px;font-size:18px}
  .feed-top{flex-wrap:wrap}
  .feed-title{font-size:16px}

  .result-hero{padding:28px 20px}
  .result-grid{padding:20px;gap:12px}
  .result-note{padding:0 20px 24px}

  .track-shell{flex-direction:column;gap:12px}
  .track-shell .btn{width:100%}
  .site-footer{padding:38px 0 34px}
}

/* 极小屏 (< 400px) 细节收紧 */
@media (max-width:400px){
  .nav-actions{padding:10px 12px 16px}
  .brand-mark{width:30px;height:30px;border-radius:10px}
  .form-body{padding:20px 16px 24px}
}