/* ============================================================
   跨设备临时传文件中转站 · 样式
   工具型极简风格，跟随系统深浅色
   ============================================================ */

:root {
  color-scheme: light dark;

  --bg: #f5f6f8;
  --bg-soft: #ffffff;
  --bg-sunken: #eceef2;
  --fg: #16181d;
  --fg-soft: #5a6069;
  --fg-faint: #878e99;
  --line: #e2e5ea;
  --line-strong: #cdd2da;
  --brand: #2f6bff;
  --brand-soft: #eaf0ff;
  --brand-fg: #ffffff;
  --ok: #128a4b;
  --ok-soft: #e6f6ed;
  --warn: #b26a00;
  --warn-soft: #fff4e0;
  --danger: #cc2b2b;
  --danger-soft: #fdeaea;
  --radius: 12px;
  --radius-lg: 18px;
  --shadow: 0 1px 2px rgba(16, 20, 30, 0.06), 0 8px 24px rgba(16, 20, 30, 0.06);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --bg-soft: #181b21;
    --bg-sunken: #0b0d11;
    --fg: #eceef2;
    --fg-soft: #a6adba;
    --fg-faint: #7b828f;
    --line: #262a32;
    --line-strong: #363c47;
    --brand: #4d86ff;
    --brand-soft: #17233c;
    --brand-fg: #0b0d11;
    --ok: #3ecf7a;
    --ok-soft: #12271c;
    --warn: #f0b445;
    --warn-soft: #2b2213;
    --danger: #ff6b6b;
    --danger-soft: #2d1517;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
    "Source Han Sans SC", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--brand);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.wrap {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 顶栏 ---------- */
.topbar {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar .wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 58px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  color: var(--fg);
  font-size: 16px;
  letter-spacing: 0.2px;
}
.logo:hover {
  text-decoration: none;
}
.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(140deg, var(--brand), color-mix(in srgb, var(--brand) 55%, #7b3bff));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 14px;
  flex: none;
}
.topbar .spacer {
  flex: 1;
}
.topbar nav a {
  color: var(--fg-soft);
  font-size: 14px;
  margin-left: 16px;
}
.topbar nav a:hover {
  color: var(--fg);
}

/* ---------- 布局 ---------- */
main {
  flex: 1;
  padding: 30px 0 60px;
}
.hero {
  margin-bottom: 22px;
}
.hero h1 {
  font-size: 25px;
  line-height: 1.35;
  margin: 0 0 8px;
  letter-spacing: -0.2px;
}
.hero p {
  margin: 0;
  color: var(--fg-soft);
  font-size: 14.5px;
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 18px;
}
.card.tight {
  padding: 16px 18px;
}
.card h2 {
  font-size: 16px;
  margin: 0 0 14px;
}
.card h3 {
  font-size: 14px;
  margin: 0 0 8px;
  color: var(--fg-soft);
  font-weight: 600;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.row.between {
  justify-content: space-between;
}
.grow {
  flex: 1;
  min-width: 0;
}
.muted {
  color: var(--fg-soft);
}
.faint {
  color: var(--fg-faint);
  font-size: 13px;
}
.mono {
  font-family: var(--mono);
}
.mt0 {
  margin-top: 0;
}
.mt8 {
  margin-top: 8px;
}
.mt16 {
  margin-top: 16px;
}
.mb0 {
  margin-bottom: 0;
}
.hidden {
  display: none !important;
}

/* ---------- 拖拽区 ---------- */
.dropzone {
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  background: var(--bg-sunken);
}
.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--brand);
  outline: none;
}
.dropzone.dragover {
  border-color: var(--brand);
  background: var(--brand-soft);
  transform: scale(1.006);
}
.dropzone .icon {
  font-size: 30px;
  line-height: 1;
  margin-bottom: 10px;
}
.dropzone .primary {
  font-weight: 600;
  margin-bottom: 4px;
}
.dropzone .secondary {
  color: var(--fg-soft);
  font-size: 13.5px;
}

/* ---------- 文件列表 ---------- */
.filelist {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.filelist li {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.filelist li:last-child {
  border-bottom: none;
}
.filelist .fname {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.filelist .fsize {
  color: var(--fg-soft);
  font-size: 13px;
  font-family: var(--mono);
  flex: none;
}
.filelist .rm {
  border: none;
  background: transparent;
  color: var(--fg-faint);
  cursor: pointer;
  font-size: 17px;
  line-height: 1;
  padding: 2px 5px;
  border-radius: 6px;
  flex: none;
}
.filelist .rm:hover {
  color: var(--danger);
  background: var(--danger-soft);
}

/* ---------- 表单 ---------- */
label.field {
  display: block;
  margin-bottom: 14px;
}
label.field > span.lbl {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 6px;
}
label.field > span.hint {
  display: block;
  font-size: 12.5px;
  color: var(--fg-soft);
  margin-top: 6px;
}
input[type="text"],
input[type="password"],
input[type="search"] {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 22%, transparent);
}
input.code-input {
  font-family: var(--mono);
  font-size: 20px;
  letter-spacing: 2px;
  text-align: center;
  text-transform: uppercase;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14.5px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: filter 0.12s, background 0.12s, border-color 0.12s;
  white-space: nowrap;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-primary {
  background: var(--brand);
  color: var(--brand-fg);
}
.btn-primary:not(:disabled):hover {
  filter: brightness(1.08);
}
.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--fg);
}
.btn-ghost:not(:disabled):hover {
  background: var(--bg-sunken);
}
.btn-danger {
  background: transparent;
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
  color: var(--danger);
}
.btn-danger:not(:disabled):hover {
  background: var(--danger-soft);
}
.btn-sm {
  padding: 6px 11px;
  font-size: 13px;
  border-radius: 8px;
}
.btn-block {
  width: 100%;
}

/* ---------- 进度 ---------- */
.progress {
  height: 8px;
  border-radius: 99px;
  background: var(--bg-sunken);
  overflow: hidden;
  border: 1px solid var(--line);
}
.progress > i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--brand), color-mix(in srgb, var(--brand) 60%, #7b3bff));
  transition: width 0.18s ease-out;
}
.progress-legend {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--fg-soft);
  margin-top: 7px;
  font-family: var(--mono);
}

/* ---------- 提示条 ---------- */
.alert {
  border-radius: var(--radius);
  padding: 11px 14px;
  font-size: 14px;
  border: 1px solid transparent;
  margin-bottom: 14px;
}
.alert-info {
  background: var(--brand-soft);
  border-color: color-mix(in srgb, var(--brand) 25%, transparent);
}
.alert-ok {
  background: var(--ok-soft);
  border-color: color-mix(in srgb, var(--ok) 30%, transparent);
  color: var(--ok);
}
.alert-warn {
  background: var(--warn-soft);
  border-color: color-mix(in srgb, var(--warn) 30%, transparent);
}
.alert-danger {
  background: var(--danger-soft);
  border-color: color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger);
}

/* ---------- 取件码展示 ---------- */
.codebox {
  text-align: center;
  padding: 6px 0 2px;
}
.code-value {
  font-family: var(--mono);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: 5px;
  margin: 6px 0 14px;
  user-select: all;
  word-break: break-all;
}
.code-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}
.linkbox {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}
.linkbox input {
  font-size: 13px;
  font-family: var(--mono);
}
.qr {
  margin-top: 18px;
  text-align: center;
}
.qr img {
  width: 168px;
  height: 168px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 6px;
}

/* ---------- 事实表 ---------- */
.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 4px;
}
.fact {
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
}
.fact .k {
  font-size: 12.5px;
  color: var(--fg-soft);
  margin-bottom: 3px;
}
.fact .v {
  font-size: 15px;
  font-weight: 600;
  font-family: var(--mono);
}
.fact .v.small {
  font-size: 13.5px;
  font-weight: 500;
}

/* ---------- 徽标 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12.5px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 99px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  color: var(--fg-soft);
}
.badge-ok {
  background: var(--ok-soft);
  border-color: color-mix(in srgb, var(--ok) 30%, transparent);
  color: var(--ok);
}
.badge-warn {
  background: var(--warn-soft);
  border-color: color-mix(in srgb, var(--warn) 35%, transparent);
  color: var(--warn);
}
.badge-danger {
  background: var(--danger-soft);
  border-color: color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger);
}

/* ---------- 规则说明 ---------- */
.rules {
  margin: 0;
  padding-left: 20px;
  color: var(--fg-soft);
  font-size: 13.5px;
}
.rules li {
  margin-bottom: 5px;
}
.rules strong {
  color: var(--fg);
}

/* ---------- 步骤 ---------- */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 34px;
  margin-bottom: 12px;
  color: var(--fg-soft);
  font-size: 14px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12.5px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.steps li strong {
  color: var(--fg);
}

/* ---------- 页脚 ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 18px 0 26px;
  color: var(--fg-faint);
  font-size: 12.5px;
}
footer .wrap {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: space-between;
}

/* ---------- 多批上传选择器（取件页） ---------- */
.upload-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.upload-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--fg);
  border-radius: 10px;
  padding: 10px 13px;
  cursor: pointer;
  font-family: inherit;
  transition: border-color 0.15s, background 0.15s;
}
.upload-item:hover {
  border-color: var(--brand);
}
.upload-item.active {
  border-color: var(--brand);
  background: var(--brand-soft);
}
.upload-item .u-time {
  font-weight: 600;
  font-size: 13.5px;
  margin-bottom: 2px;
}
.upload-item .u-meta {
  font-size: 12.5px;
  color: var(--fg-soft);
}

/* ---------- 让链接式按钮和普通按钮对齐 ---------- */
a.btn {
  text-decoration: none;
}
a.btn:hover {
  text-decoration: none;
}

/* ---------- 移动端 ---------- */
@media (max-width: 560px) {
  .wrap {
    padding: 0 14px;
  }
  .card {
    padding: 17px;
    border-radius: var(--radius);
  }
  .hero h1 {
    font-size: 21px;
  }
  .code-value {
    font-size: 29px;
    letter-spacing: 3px;
  }
  .dropzone {
    padding: 26px 14px;
  }
  .linkbox {
    flex-direction: column;
  }
}

/* ---------- 无障碍 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}