/* ========= 校园服务平台 · 通用样式 ========= */
:root{
  --primary:#00B578;
  --primary-dark:#00A86B;
  --primary-light:#00D68F;
  --primary-bg:#E6FBF3;
  --orange:#FF8C42;
  --yellow:#FFD93D;
  --blue:#4A90E2;
  --red:#FF6B6B;
  --text-main:#1A1D26;
  --text-sub:#6B7280;
  --text-placeholder:#9CA3AF;
  --divider:#E5E7EB;
  --bg-page:#F5F7FA;
  --card-shadow:0 4px 16px rgba(0,0,0,.06);
  --card-shadow-hover:0 8px 24px rgba(0,181,120,.12);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:24px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;-webkit-text-size-adjust:100% !important;text-size-adjust:100% !important;-moz-text-size-adjust:100% !important;}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  background:var(--bg-page);
  color:var(--text-main);
  font-size:14px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;}
input,textarea,select{font-family:inherit;outline:none;}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;}

/* ========= 导航栏 ========= */
.navbar{
  position:sticky;top:0;z-index:50;
  background:#fff;
  border-bottom:1px solid var(--divider);
  box-shadow:0 1px 3px rgba(0,0,0,.03);
}
.nav-inner{
  max-width:1200px;margin:0 auto;
  padding:0 24px;height:60px;
  display:flex;align-items:center;gap:32px;
}
.nav-logo{font-size:20px;font-weight:800;color:var(--primary);white-space:nowrap;}
.nav-logo .hl{color:var(--primary-dark);}
.nav-menu{display:flex;gap:8px;align-items:center;flex:1;}
.nav-menu a{
  padding:8px 14px;
  border-radius:8px;
  color:var(--text-sub);
  font-weight:500;
  font-size:14px;
  transition:color .15s, background .15s;
}
.nav-menu a:hover{color:var(--text-main);background:var(--bg-page);}
.nav-menu a.active{color:var(--primary);background:var(--primary-bg);}
.nav-right{display:flex;align-items:center;gap:8px;}
.nav-avatar{
  width:32px;height:32px;border-radius:50%;
  background:var(--primary-bg);color:var(--primary);
  display:flex;align-items:center;justify-content:center;
  font-weight:600;font-size:14px;overflow:hidden;
}
.nav-burger{display:none;width:40px;height:40px;align-items:center;justify-content:center;border-radius:8px;}
.nav-burger:hover{background:var(--bg-page);}
.nav-burger svg{width:22px;height:22px;color:var(--text-main);}

/* 抽屉式手机菜单 */
.nav-drawer{
  display:none;
  position:fixed;top:60px;left:0;right:0;bottom:0;
  background:#fff;
  flex-direction:column;
  padding:12px 16px;
  z-index:49;
  overflow-y:auto;
}
.nav-drawer.open{display:flex;}
.nav-drawer a{
  padding:14px 12px;
  border-radius:8px;
  color:var(--text-main);
  font-size:16px;
  font-weight:500;
  border-bottom:1px solid var(--divider);
}
.nav-drawer a.active{color:var(--primary);background:var(--primary-bg);}

/* ========= 容器 ========= */
.container{max-width:1200px;margin:0 auto;padding:24px;}
.container-sm{max-width:640px;margin:0 auto;padding:24px;}
.container-lg{max-width:1400px;margin:0 auto;padding:24px;}

/* ========= 卡片 ========= */
.card{
  background:#fff;
  border-radius:var(--radius-lg);
  box-shadow:var(--card-shadow);
  padding:20px;
}
.card-hover:hover{box-shadow:var(--card-shadow-hover);transform:translateY(-2px);}
.card-title{font-size:18px;font-weight:700;margin-bottom:14px;}

/* ========= 按钮 ========= */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 20px;
  border-radius:10px;
  font-size:14px;font-weight:600;
  transition:all .15s;
  white-space:nowrap;
}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-dark);}
.btn-primary:disabled{background:#B0D8C8;cursor:not-allowed;transform:none;}
.btn-outline{background:#fff;color:var(--primary);border:1.5px solid var(--primary);}
.btn-outline:hover{background:var(--primary-bg);}
.btn-ghost{background:transparent;color:var(--text-sub);}
.btn-ghost:hover{background:var(--bg-page);color:var(--text-main);}
.btn-danger{background:var(--red);color:#fff;}
.btn-danger:hover{background:#E54848;}
.btn-block{width:100%;display:flex;}
.btn-lg{padding:14px 24px;font-size:15px;}
.btn-sm{padding:6px 12px;font-size:12px;}

/* ========= 表单 ========= */
.form-group{margin-bottom:18px;}
.form-label{display:block;font-size:13px;color:var(--text-sub);margin-bottom:6px;font-weight:500;}
.form-label .req{color:var(--red);}
.form-control{
  width:100%;
  padding:11px 14px;
  background:#F7F8FA;
  border:1.5px solid transparent;
  border-radius:10px;
  font-size:14px;
  color:var(--text-main);
  transition:border-color .15s, background .15s;
}
.form-control:focus{border-color:var(--primary);background:#fff;}
textarea.form-control{min-height:90px;resize:vertical;font-family:inherit;}
select.form-control{cursor:pointer;}
.form-row{display:flex;gap:12px;}
.form-row > *{flex:1;}
.form-hint{margin-top:6px;font-size:12px;color:var(--text-placeholder);}

/* 上传 */
.upload-area{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  width:100%;min-height:100px;
  background:#F7F8FA;
  border:1.5px dashed var(--divider);
  border-radius:12px;
  cursor:pointer;
  color:var(--text-placeholder);
  font-size:13px;
  transition:border-color .15s, color .15s;
  position:relative;
  overflow:hidden;
}
.upload-area:hover{border-color:var(--primary);color:var(--primary);}
.upload-area svg{width:24px;height:24px;margin-bottom:6px;}
.upload-preview{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(80px, 1fr));
  gap:8px;margin-top:8px;
}
.upload-preview .img-item{
  position:relative;
  padding-top:100%;
  border-radius:8px;overflow:hidden;
  background:#F0F1F3;
}
.upload-preview .img-item img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.upload-preview .img-remove{
  position:absolute;top:2px;right:2px;
  width:20px;height:20px;border-radius:50%;
  background:rgba(0,0,0,.6);color:#fff;
  font-size:14px;line-height:1;
  display:flex;align-items:center;justify-content:center;
}

/* ========= 标签 ========= */
.tag{
  display:inline-flex;align-items:center;
  padding:2px 8px;
  border-radius:6px;
  font-size:12px;
  font-weight:500;
  background:var(--bg-page);
  color:var(--text-sub);
}
.tag-primary{background:var(--primary-bg);color:var(--primary);}
.tag-orange{background:#FFF1E6;color:var(--orange);}
.tag-yellow{background:#FFF8DB;color:#B58816;}
.tag-blue{background:#E6F1FC;color:var(--blue);}
.tag-red{background:#FFE6E6;color:var(--red);}
.tag-gray{background:#F0F1F3;color:var(--text-sub);}

/* ========= 需求卡片 ========= */
.demand-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(280px, 1fr));
  gap:16px;
}
.demand-card{
  background:#fff;
  border-radius:var(--radius-lg);
  padding:16px;
  box-shadow:var(--card-shadow);
  transition:box-shadow .2s, transform .15s;
  cursor:pointer;
  border:1px solid transparent;
}
.demand-card:hover{box-shadow:var(--card-shadow-hover);transform:translateY(-2px);border-color:var(--primary-bg);}
.demand-card .dc-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;}
.demand-card .dc-title{font-size:15px;font-weight:600;color:var(--text-main);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.demand-card .dc-desc{font-size:13px;color:var(--text-sub);margin-top:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.demand-card .dc-foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;}
.demand-card .dc-reward{color:var(--orange);font-weight:700;font-size:16px;}
.demand-card .dc-reward small{font-size:12px;font-weight:500;}
.demand-card .dc-meta{font-size:12px;color:var(--text-placeholder);}
.demand-card .dc-images{display:flex;gap:6px;margin-top:8px;overflow:hidden;}
.demand-card .dc-images img{width:60px;height:60px;border-radius:6px;object-fit:cover;}
.demand-card .dc-publisher{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-sub);margin-top:10px;padding-top:10px;border-top:1px solid var(--divider);}
.demand-card .dc-avatar{width:22px;height:22px;border-radius:50%;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;overflow:hidden;}

/* ========= 底部（单行小字） ========= */
.footer{
  background:transparent;color:var(--text-placeholder);
  padding:18px 16px 22px;
  margin-top:32px;
}
.footer-inner{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:4px 10px;max-width:900px;margin:0 auto;font-size:12px;line-height:1.8;}
.footer h4{display:none;}
.footer a{display:inline;padding:0 2px;font-size:12px;color:var(--text-sub);}
.footer a:hover{color:var(--primary);}
.footer-qrcode{display:none;}
.footer-bottom{
  max-width:900px;margin:0 auto;padding-top:0;
  border-top:none;
  text-align:center;font-size:12px;
}

/* ========= Toast ========= */
.toast{
  position:fixed;top:24px;left:50%;
  transform:translateX(-50%) translateY(-20px);
  background:rgba(26,29,38,.92);color:#fff;
  padding:10px 18px;border-radius:10px;
  font-size:14px;z-index:9999;
  opacity:0;transition:opacity .25s, transform .25s;
  pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.toast.err{background:rgba(255,107,107,.95);}
.toast.success{background:rgba(0,181,120,.95);}

/* ========= 空状态 ========= */
.empty{
  text-align:center;padding:60px 20px;
  color:var(--text-placeholder);
}
.empty svg{width:64px;height:64px;margin:0 auto 16px;opacity:.4;}
.empty p{font-size:14px;}

/* ========= 模态框 ========= */
.modal-mask{
  position:fixed;inset:0;background:rgba(0,0,0,.5);
  display:flex;align-items:center;justify-content:center;
  z-index:200;opacity:0;pointer-events:none;
  transition:opacity .2s;
}
.modal-mask.open{opacity:1;pointer-events:auto;}
.modal-box{
  background:#fff;border-radius:16px;
  width:90%;max-width:420px;
  padding:24px;
  transform:scale(.92);transition:transform .2s;
}
.modal-mask.open .modal-box{transform:scale(1);}
.modal-title{font-size:18px;font-weight:700;margin-bottom:12px;}
.modal-body{color:var(--text-sub);margin-bottom:20px;}
.modal-foot{display:flex;gap:8px;justify-content:flex-end;}

/* ========= 响应式 ========= */
@media (max-width:768px){
  .nav-inner{padding:0 16px;gap:8px;}
  .nav-menu{display:none;}
  .nav-burger{display:flex;}
  .nav-right .btn:not(.nav-burger){display:none;}
  .nav-right .btn.nav-logout{display:inline-flex;} /* 手机端保留"退出"按钮可见 */
  .container,.container-sm,.container-lg{padding:16px;}
  .footer-inner{grid-template-columns:1fr;gap:20px;text-align:center;}
  .footer-qrcode{margin:0 auto;}
  .demand-grid{grid-template-columns:1fr;gap:12px;}
  .form-row{flex-direction:column;}
  .nav-avatar{margin-right:0;}
}