/* ============================================================
   HTML 展厅 - 全局样式（移动端优先 · 企业级精简）
   设计原则：中性灰阶为主、主色克制点缀、细边框替代重阴影、
             8px 间距基准、信息层级收敛
   ============================================================ */
:root {
  --primary: #0ea5e9;
  --primary-dark: #0284c7;
  --primary-tint: #f0f9ff;
  --danger: #dc2626;
  --danger-tint: #fef2f2;
  --text: #111827;
  --text-2: #4b5563;
  --text-3: #9ca3af;
  --bg: #f8f9fa;
  --card: #ffffff;
  --border: #eceef0;
  --border-strong: #e2e5e8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(17, 24, 39, .04);
  --nav-h: 54px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
  padding-bottom: env(safe-area-inset-bottom);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; font-size: 15px; }

.wrap { max-width: 720px; margin: 0 auto; padding: 0 14px; }
.hidden { display: none !important; }

/* SVG 图标 */
.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-sm { width: 16px; height: 16px; }
.icon-lg { width: 22px; height: 22px; }

/* ------------------------------------------------------------ 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { max-width: 720px; margin: 0 auto; padding: 0 14px;
  height: 100%; display: flex; align-items: center; gap: 10px; }
.nav-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; }
.nav-logo .logo-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary);
  display: grid; place-items: center; color: #fff;
}
.nav-logo .logo-mark .icon { width: 17px; height: 17px; stroke-width: 2.2; }
.nav-spacer { flex: 1; }
.nav-upload {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--primary); color: #fff;
  height: 34px; padding: 0 13px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600;
}
.nav-upload:active { background: var(--primary-dark); }

/* ------------------------------------------------------------ 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 42px; padding: 0 16px; border-radius: var(--radius-sm);
  font-size: 14.5px; font-weight: 600;
  background: #f3f5f6; color: var(--text);
  border: 1px solid transparent;
  transition: transform .05s, background .15s;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:active { background: var(--primary-dark); }
.btn-danger { background: var(--danger-tint); color: var(--danger); }
.btn-outline { background: #fff; border-color: var(--border-strong); color: var(--text-2); }
.btn-block { width: 100%; }
.btn-sm { height: 32px; padding: 0 11px; font-size: 13px; border-radius: 7px; }
.btn[disabled] { opacity: .5; pointer-events: none; }

/* ------------------------------------------------------------ 表单 */
.field { margin-bottom: 15px; }
.field label { display: block; font-size: 13.5px; font-weight: 600;
  margin-bottom: 6px; color: var(--text-2); }
.field .hint { font-weight: 400; color: var(--text-3); font-size: 12px; }
.input, .textarea {
  width: 100%; padding: 11px 13px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: #fff; color: var(--text); outline: none;
  transition: border-color .15s;
}
.input:focus, .textarea:focus { border-color: var(--primary); }
.textarea { resize: vertical; min-height: 88px; }
.field .count { text-align: right; font-size: 11.5px; color: var(--text-3); margin-top: 4px; }

/* ------------------------------------------------------------ 卡片 */
.card {
  background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 15px; margin-bottom: 12px;
}

/* ------------------------------------------------------------ 首页（精简 Hero） */
.hero { padding: 20px 0 4px; }
.hero h1 { font-size: 21px; margin: 0 0 5px; letter-spacing: -.3px; font-weight: 800; }
.hero p { margin: 0; color: var(--text-2); font-size: 14px; }

/* 搜索 */
.searchbar { position: relative; margin: 14px 0 10px; }
.searchbar .icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%);
  color: var(--text-3); width: 17px; height: 17px; }
.searchbar input {
  width: 100%; height: 42px; padding: 0 38px 0 40px;
  border-radius: var(--radius-sm); border: 1px solid var(--border-strong);
  background: #fff; outline: none;
}
.searchbar input:focus { border-color: var(--primary); }
.searchbar .clear { position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  width: 30px; height: 30px; display: grid; place-items: center; color: var(--text-3); }

/* 排序 */
.segmented { display: flex; background: #eef0f1; border-radius: var(--radius-sm);
  padding: 3px; margin-bottom: 10px; }
.segmented button { flex: 1; height: 32px; border-radius: 6px; font-size: 13px;
  color: var(--text-2); font-weight: 600; }
.segmented button.active { background: #fff; color: var(--primary-dark);
  box-shadow: 0 1px 2px rgba(0,0,0,.08); }

/* 标签横滚 */
.tag-row { display: flex; gap: 7px; overflow-x: auto; padding: 2px 0 10px;
  scrollbar-width: none; }
.tag-row::-webkit-scrollbar { display: none; }
.chip {
  flex: none; height: 30px; padding: 0 13px; display: inline-flex; align-items: center;
  border-radius: 999px; background: #fff; border: 1px solid var(--border-strong);
  font-size: 12.5px; color: var(--text-2); white-space: nowrap;
}
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.chip-mini { height: 22px; padding: 0 8px; font-size: 11.5px; border-radius: 6px;
  background: #f3f5f6; color: var(--text-2); }

/* ------------------------------------------------------------ 作品卡片 */
.work-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.work-card { display: block; background: #fff; border-radius: var(--radius);
  border: 1px solid var(--border); overflow: hidden; margin-bottom: 0;
  transition: border-color .15s; }
.work-card:active { border-color: var(--border-strong); }
.work-cover { position: relative; height: 110px; overflow: hidden; }
.work-cover.auto { display: grid; place-items: center; }
.work-cover.auto .big-initial { font-size: 44px; font-weight: 800; color: rgba(255,255,255,.92);
  text-shadow: 0 2px 10px rgba(0,0,0,.14); z-index:1; }
.work-cover.auto::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 82% 130%, rgba(255,255,255,.22), transparent 55%);
}
.work-cover img { width: 100%; height: 100%; object-fit: contain; object-position: top center; background: #f3f4f6; }
.work-body { padding: 9px 10px; }
.work-title { font-size: 14px; font-weight: 700; margin: 0 0 2px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.work-author { font-size: 11px; color: var(--text-3); margin-bottom: 4px; }
.work-desc { display: none; }
.work-tags { display: none; }
.work-stats { display: flex; gap: 10px; color: var(--text-3); font-size: 11px; }
.work-stats span { display: inline-flex; align-items: center; gap: 3px; }
.work-stats .icon { width: 12px; height: 12px; }

/* ------------------------------------------------------------ 骨架屏 */
.skeleton { background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.skeleton .sk-cover { height: 128px; }
.skeleton .sk-body { padding: 12px 13px; }
.skeleton .sk-line { height: 11px; border-radius: 6px; margin-bottom: 9px;
  background: var(--border); }
.skeleton .sk-line.w60 { width: 60%; } .skeleton .sk-line.w40 { width: 40%; }
.skeleton .sk-line.w90 { width: 90%; }
.shimmer { position: relative; overflow: hidden; }
.shimmer::after {
  content: ""; position: absolute; inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.65), transparent);
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 100% { transform: translateX(100%); } }

/* ------------------------------------------------------------ 详情页 */
.detail-head { padding: 16px 0 2px; }
.detail-title { font-size: 20px; font-weight: 800; margin: 0 0 5px; letter-spacing: -.3px; }
.detail-meta { font-size: 12.5px; color: var(--text-3); margin-bottom: 9px; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.detail-stats { display: flex; gap: 18px; color: var(--text-2); font-size: 13px; }
.detail-stats span { display: inline-flex; align-items: center; gap: 5px; }
.detail-desc { white-space: pre-wrap; color: var(--text-2); font-size: 14px; margin: 0; }

.action-row { display: flex; gap: 8px; margin: 13px 0; }
.action-row .btn { flex: 1; white-space: nowrap; padding: 0 8px; }
.action-row .btn:first-child { flex: 1.25; }
.like-btn.liked { background: var(--danger-tint); color: var(--danger); }
.report-link { display: flex; align-items: center; justify-content: center; gap: 5px;
  color: var(--text-3); font-size: 12.5px; padding: 9px; width: 100%; }

/* 预览 */
.preview-frame-wrap { border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); background: #fff; margin-bottom: 12px; }
.preview-bar { display: flex; align-items: center; gap: 8px;
  padding: 8px 11px; border-bottom: 1px solid var(--border); background: #fafbfb; }
.preview-bar .dots { display: flex; gap: 4px; }
.preview-bar .dots i { width: 8px; height: 8px; border-radius: 50%; background: #cfd6da; display: block; }
.preview-bar .sandbox-tag { font-size: 11px; color: var(--text-3); }
.preview-bar .spacer { flex: 1; }
.preview-bar .btn-sm { padding: 0 9px; }
.preview-frame { display: block; width: 100%; height: 56vh; border: none; background: #fff; }

/* ------------------------------------------------------------ 评论 */
.section-title { font-size: 15px; font-weight: 700; margin: 16px 0 9px;
  display: flex; align-items: center; gap: 6px; }
.comment { padding: 11px 0; border-bottom: 1px solid var(--border); }
.comment:last-child { border-bottom: none; }
.comment-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 2px; }
.comment-author { font-weight: 700; font-size: 13.5px; }
.comment-time { font-size: 11.5px; color: var(--text-3); }
.comment-content { margin: 0; font-size: 13.5px; white-space: pre-wrap; word-break: break-word; }
.comment-form { margin-top: 12px; }
.comment-form textarea { min-height: 66px; margin-bottom: 8px; }
.comment-form .row { display: flex; gap: 8px; }
.comment-form .row .btn { flex: none; width: 88px; }

/* ------------------------------------------------------------ 上传页文件区 */
.file-pick {
  border: 1.5px dashed var(--border-strong); border-radius: var(--radius-sm);
  padding: 24px 16px; text-align: center; background: #fcfdfd;
  display: block; cursor: pointer;
}
.file-pick .icon { width: 34px; height: 34px; color: var(--primary); margin-bottom: 7px; }
.file-pick .t { font-weight: 600; font-size: 14.5px; }
.file-pick .s { font-size: 12px; color: var(--text-3); margin-top: 3px; }
.file-pick.has-file { border-style: solid; border-color: var(--primary); background: var(--primary-tint); }
.file-pick.has-file .fname { font-weight: 600; color: var(--primary-dark);
  display: flex; align-items: center; justify-content: center; gap: 6px; font-size: 13.5px; word-break: break-all; }
.file-pick.has-file .change { font-size: 12px; color: var(--text-2); margin-top: 5px; text-decoration: underline; }

.progress { height: 7px; background: var(--border); border-radius: 999px; overflow: hidden; margin: 12px 0; }
.progress i { display: block; height: 100%; width: 0; background: var(--primary);
  border-radius: 999px; transition: width .2s; }

/* ------------------------------------------------------------ 弹层 / Toast */
.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(17, 24, 39, .4);
  display: flex; align-items: flex-end; justify-content: center;
}
.modal {
  width: 100%; max-width: 720px; background: #fff;
  border-radius: 16px 16px 0 0; padding: 19px 17px calc(19px + env(safe-area-inset-bottom));
  animation: slideUp .18s ease;
}
@keyframes slideUp { from { transform: translateY(36px); opacity: .6; } }
.modal h3 { margin: 0 0 12px; font-size: 16px; }
.modal .modal-close-row { display: flex; justify-content: flex-end; margin-top: 12px; gap: 8px; }
.modal .modal-close-row .btn { flex: 1; }
.radio-item { display: flex; align-items: center; gap: 10px; padding: 11px 4px;
  border-bottom: 1px solid var(--border); font-size: 14.5px; }
.radio-item input { width: 17px; height: 17px; accent-color: var(--primary); }

.toast {
  position: fixed; left: 50%; bottom: 86px; transform: translateX(-50%);
  background: rgba(17, 24, 39, .92); color: #fff;
  padding: 10px 18px; border-radius: 999px; font-size: 13.5px;
  z-index: 200; max-width: 86%; text-align: center;
  animation: toastIn .18s;
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 10px); } }

/* ------------------------------------------------------------ 空状态 / 加载 */
.empty { text-align: center; padding: 46px 20px; color: var(--text-3); }
.empty .icon { width: 52px; height: 52px; margin-bottom: 9px; stroke-width: 1.3; }
.empty .t { font-size: 14px; }
.spinner { width: 24px; height: 24px; margin: 28px auto; }
.spinner circle { fill: none; stroke: var(--primary); stroke-width: 3;
  stroke-linecap: round; stroke-dasharray: 66; animation: spin 1s linear infinite;
  transform-origin: center; }
@keyframes spin { to { transform: rotate(360deg); } }
.load-more-row { text-align: center; padding: 4px 0 24px; }

/* ------------------------------------------------------------ 管理后台 */
.login-box { max-width: 380px; margin: 56px auto; padding: 0 16px; }
.login-box .login-logo { text-align: center; margin-bottom: 20px; }
.login-box .login-logo .logo-mark {
  width: 50px; height: 50px; border-radius: 13px; margin: 0 auto 10px;
  background: var(--primary);
  display: grid; place-items: center; color: #fff;
}
.login-box .login-logo .icon { width: 28px; height: 28px; }
.login-box h1 { font-size: 18px; margin: 0; }
.admin-tabs { display: flex; gap: 4px; background: #eef0f1; border-radius: var(--radius-sm);
  padding: 3px; margin: 13px 0; }
.admin-tabs button { flex: 1; height: 34px; border-radius: 6px; font-size: 13px;
  font-weight: 600; color: var(--text-2); position: relative; }
.admin-tabs button.active { background: #fff; color: var(--primary-dark);
  box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.badge { position: absolute; top: -5px; right: 5px; background: var(--danger); color: #fff;
  font-size: 10px; min-width: 16px; height: 16px; border-radius: 999px;
  display: grid; place-items: center; padding: 0 4px; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; margin: 12px 0; }
.stat-box { background: #fff; border-radius: var(--radius-sm); padding: 13px;
  border: 1px solid var(--border); }
.stat-box .n { font-size: 20px; font-weight: 800; }
.stat-box .n-sub { font-size: 13px; font-weight: 600; color: var(--text-3); margin-left: 2px; }
.stat-box .l { font-size: 12px; color: var(--text-3); }
.admin-item { background: #fff; border-radius: var(--radius-sm); padding: 11px; margin-bottom: 9px;
  border: 1px solid var(--border); display: flex; gap: 10px; }
.admin-item .thumb { width: 54px; height: 54px; border-radius: var(--radius-sm); overflow: hidden;
  flex: none; display: grid; place-items: center; font-weight: 800; color: #fff; font-size: 20px; }
.admin-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.admin-item .info { flex: 1; min-width: 0; }
.admin-item .info .t { font-weight: 700; font-size: 14px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.admin-item .info .s { font-size: 11.5px; color: var(--text-3); margin: 2px 0 6px; }
.admin-item .btns { display: flex; gap: 5px; flex-wrap: wrap; }
.status-tag { font-size: 10.5px; padding: 1px 6px; border-radius: 5px; font-weight: 600; }
.status-online { background: #dcfce7; color: #15803d; }
.status-offline { background: var(--danger-tint); color: #b91c1c; }
.admin-item.report .reason { font-size: 13px; font-weight: 600; margin-bottom: 3px; }
.admin-item.report .detail { font-size: 12px; color: var(--text-2); }
.admin-comment-text { font-size: 13px; color: var(--text-2); margin: 3px 0 6px;
  white-space: pre-wrap; word-break: break-word; }
.logout-row { display: flex; justify-content: flex-end; padding: 9px 0; }

/* ------------------------------------------------------------ 桌面端 */
@media (min-width: 640px) {
  .work-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .work-grid .work-card, .work-grid .skeleton { margin-bottom: 0; }
  .work-cover { height: 140px; }
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
}