:root {
  --bg: #f4f6f9;
  --elev: #ffffff;
  --soft: #eef1f5;
  --line: #dbe1e8;
  --line-soft: #eaeef3;
  --text: #16202b;
  --muted: #6b7484;
  --accent: #0b7fc4;
  --accent-soft: rgba(11, 127, 196, 0.12);
  --danger: #cf222e;
  --radius: 14px;
  --shadow: 0 18px 48px rgba(15, 23, 42, 0.18);
}

/* 跟随系统深色模式，手机上夜里看不再刺眼 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --elev: #161e28;
    --soft: #1d2733;
    --line: #2b3846;
    --line-soft: #212c38;
    --text: #e6edf5;
    --muted: #94a2b3;
    --accent: #4aa8e0;
    --accent-soft: rgba(74, 168, 224, 0.16);
    --danger: #f4696f;
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}
body.modal-open { overflow: hidden; }
.hidden { display: none !important; }

/* 未解锁时挡在文件界面之前：整个服务都要超级码 */
.gate {
  display: flex;
  justify-content: center;
  padding: 12vh 16px 24px;
}

.gate-card {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 26px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--elev);
  box-shadow: var(--shadow);
}

.gate-icon { font-size: 30px; line-height: 1; }
.gate-title { margin: 0; font-size: 17px; }
.gate-sub { margin: 0; color: var(--muted); font-size: 12.5px; text-align: center; }
.gate-input {
  width: 100%; height: 42px; padding: 0 12px;
  border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text); font-size: 14px;
}
.gate-input:focus { border-color: var(--accent); outline: none; }
.gate-hint { color: var(--danger); font-size: 12.5px; text-align: center; }
.gate-submit { width: 100%; height: 42px; justify-content: center; text-decoration: none; }

button { font: inherit; color: inherit; cursor: pointer; }
input { font: inherit; }

/* ---------- 顶栏 ---------- */
.appbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 56px;
  padding: 8px 12px;
  background: var(--elev);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 0;
  background: none;
  padding: 6px 4px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 17px;
}
.brand-icon { font-size: 19px; }
.appbar-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 8px; margin-left: auto; }
.appbar-home { text-decoration: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-height: 38px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--elev);
  color: var(--text);
  white-space: nowrap;
  transition: border-color .15s, background .15s, color .15s;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; border-color: var(--line); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.danger.solid { background: var(--danger); color: #fff; font-weight: 700; }
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--elev);
  font-size: 17px;
  line-height: 1;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.admin-btn { font-weight: 600; }
.admin-btn.active { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.btn .btn-short { display: none; }

body:not(.is-admin) .admin-only { display: none !important; }

/* ---------- 布局 ---------- */
.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 12px 12px calc(40px + env(safe-area-inset-bottom));
}

.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.crumbs { display: flex; align-items: center; flex: 1 1 auto; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.crumbs::-webkit-scrollbar { display: none; }
.crumb {
  flex: 0 0 auto;
  border: 0;
  background: none;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
}
.crumb:hover { background: var(--soft); color: var(--text); }
.crumb.current { color: var(--text); cursor: default; }
.crumb-sep { flex: 0 0 auto; color: var(--muted); opacity: .5; }
.toolbar-actions { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }

/* ---------- 用量 ---------- */
.usage { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.usage-track { flex: 1 1 auto; height: 5px; border-radius: 6px; background: var(--line-soft); overflow: hidden; }
.usage-fill { height: 100%; width: 0; background: var(--accent); transition: width .3s; }
.usage-fill.warn { background: var(--danger); }
.usage-text { flex: 0 0 auto; color: var(--muted); font-size: 12px; white-space: nowrap; }

/* ---------- 文件列表 ---------- */
.list {
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.empty { padding: 44px 16px; text-align: center; color: var(--muted); }
.empty.small { padding: 26px 12px; font-size: 13px; }
.empty-hint { display: block; margin-top: 6px; font-size: 12px; opacity: .8; }

.row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 92px 152px 40px;
  align-items: center;
  column-gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-soft);
}
.row:last-child { border-bottom: 0; }
@media (hover: hover) {
  .row:hover { background: var(--soft); }
}
.row-icon { font-size: 18px; line-height: 1; text-align: center; }
.row-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.name-btn {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: 0;
  background: none;
  padding: 0;
  font: inherit;
  font-weight: 600;
  text-align: left;
  color: var(--text);
}
.name-link { color: var(--accent); text-decoration: none; }
.name-link:hover { text-decoration: underline; }
.row-meta { display: contents; }
.row-size, .row-time { color: var(--muted); font-size: 12px; text-align: right; }
.row-more, .row-more-placeholder { width: 40px; height: 40px; }
.row-more {
  border: 0;
  background: none;
  border-radius: 10px;
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
}
.row-more:hover { background: var(--soft); color: var(--text); }

/* ---------- 拖拽上传 ---------- */
.drop-hint {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(11, 127, 196, .18);
  pointer-events: none;
}
.drop-hint-box {
  padding: 22px 30px;
  background: var(--elev);
  border: 2px dashed var(--accent);
  border-radius: 16px;
  box-shadow: var(--shadow);
  color: var(--accent);
  font-weight: 700;
}

/* ---------- 上传进度 ---------- */
.upload-box {
  position: fixed;
  left: 50%;
  top: calc(66px + env(safe-area-inset-top));
  transform: translateX(-50%);
  z-index: 70;
  width: min(92vw, 420px);
  padding: 10px 14px;
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.upload-text {
  margin-bottom: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted);
  font-size: 12px;
}
.upload-track { height: 5px; border-radius: 6px; background: var(--line-soft); overflow: hidden; }
.upload-fill { height: 100%; width: 0; background: var(--accent); transition: width .15s linear; }

/* ---------- 提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 90;
  max-width: min(90vw, 440px);
  padding: 10px 16px;
  border-radius: 10px;
  background: #1f2933;
  color: #fff;
  font-size: 13px;
  box-shadow: var(--shadow);
}

/* ---------- 弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-mask { position: absolute; inset: 0; background: rgba(15, 23, 42, .45); }
.modal-box {
  position: relative;
  display: flex;
  flex-direction: column;
  width: min(440px, 100%);
  max-height: min(80vh, 620px);
  padding: 18px;
  background: var(--elev);
  border-radius: 16px;
  box-shadow: var(--shadow);
  animation: modal-in .16s ease-out;
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(8px) scale(.98); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .modal-box, .modal.sheet .modal-box { animation: none; }
}
.modal-title { margin: 0 0 12px; font-size: 16px; font-weight: 700; word-break: break-all; }
.modal-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

/* 底部动作面板：手机贴底，桌面居中 */
.modal.sheet { align-items: flex-end; padding: 0; }
.modal.sheet .modal-box {
  width: 100%;
  max-width: none;
  max-height: 80vh;
  padding-bottom: calc(18px + env(safe-area-inset-bottom));
  border-radius: 18px 18px 0 0;
  animation: sheet-in .18s ease-out;
}
@keyframes sheet-in {
  from { transform: translateY(100%); }
  to { transform: none; }
}
.sheet-list { display: flex; flex-direction: column; }
.sheet-item {
  min-height: 50px;
  padding: 0 6px;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: none;
  font-size: 15px;
  text-align: left;
}
.sheet-item:last-child { border-bottom: 0; }
.sheet-item:hover { color: var(--accent); }
.sheet-item.danger { color: var(--danger); }

/* ---------- 表单 ---------- */
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label, .field-hint { color: var(--muted); font-size: 12px; }
.input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.input:focus { border-color: var(--accent); }
.modal-text { margin: 0; color: var(--muted); word-break: break-all; }

/* ---------- 目录选择器 ---------- */
.picker { display: flex; flex-direction: column; gap: 8px; }
.picker-crumbs { display: flex; align-items: center; gap: 2px; overflow-x: auto; padding-bottom: 2px; scrollbar-width: none; }
.picker-crumbs::-webkit-scrollbar { display: none; }
.picker-list {
  min-height: 120px;
  max-height: 46vh;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
}
.picker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 46px;
  padding: 0 12px;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: none;
  text-align: left;
}
.picker-item:last-child { border-bottom: 0; }
.picker-item:hover { background: var(--soft); }
.picker-item-icon { flex: 0 0 auto; }

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  .appbar-home { padding-inline: 9px; }
  .admin-label { display: none; }
  .brand-name { font-size: 16px; }
  .wrap { padding: 10px 10px calc(32px + env(safe-area-inset-bottom)); }
  .toolbar { flex-wrap: wrap; }
  #back-btn { order: 1; }
  .crumbs { order: 2; }
  .toolbar-actions { order: 3; flex: 1 1 100%; }
  .toolbar-actions .btn { flex: 1 1 0; }
  .btn .btn-long { display: none; }
  .btn .btn-short { display: inline; }

  .row {
    grid-template-columns: 26px minmax(0, 1fr) 40px;
    grid-template-rows: auto auto;
    row-gap: 2px;
    column-gap: 10px;
    padding: 11px 12px;
  }
  .row-icon { grid-column: 1; grid-row: 1; }
  .row-name { grid-column: 2; grid-row: 1; white-space: normal; overflow-wrap: anywhere; }
  .row-more, .row-more-placeholder { grid-column: 3; grid-row: 1; }
  .row-meta { display: flex; gap: 10px; grid-column: 2; grid-row: 2; }
  .row-size, .row-time { text-align: left; }
  .list { border-radius: 12px; }
  .usage-text { font-size: 11px; }
}