:root {
  --bg: #f5f6f8;
  --bg-elev: #ffffff;
  --card: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: #eff6ff;
  --danger: #ef4444;
  --success: #10b981;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 2px 6px rgba(15, 23, 42, .04);
  color-scheme: light;
}

/* 跟随系统的深色模式 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #020617;
    --bg-elev: #0f172a;
    --card: #1e293b;
    --fg: #f1f5f9;
    --muted: #94a3b8;
    --border: #334155;
    --border-hover: #475569;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: rgba(96, 165, 250, .15);
    --danger: #f87171;
    --shadow: 0 4px 14px rgba(0, 0, 0, .4), 0 2px 4px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

/* 显式深色模式(优先级高于系统) */
:root[data-theme="dark"] {
  --bg: #020617;
  --bg-elev: #0f172a;
  --card: #1e293b;
  --fg: #f1f5f9;
  --muted: #94a3b8;
  --border: #334155;
  --border-hover: #475569;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-soft: rgba(96, 165, 250, .15);
  --danger: #f87171;
  --shadow: 0 4px 14px rgba(0, 0, 0, .4), 0 2px 4px rgba(0, 0, 0, .3);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; padding: 0; }

/* 确保 hidden 属性总能生效(覆盖下面的 display: flex 等规则) */
[hidden] { display: none !important; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Roboto, sans-serif;
  background: var(--bg);
  background-image: radial-gradient(ellipse 80% 50% at 50% -10%, var(--accent-soft), transparent 70%);
  color: var(--fg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  min-height: 100vh;
}

button, input, textarea {
  font-family: inherit;
  font-size: 14px;
  color: inherit;
}

button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .5; }

.muted { color: var(--muted); }

/* ===== Login ===== */
.login-view {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
}
.theme-corner {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.theme-corner:hover { background: var(--accent-soft); border-color: var(--border-hover); }
.login-card {
  background: var(--card);
  padding: 32px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 360px;
  border: 1px solid var(--border);
}
.login-logo {
  font-size: 44px;
  text-align: center;
  margin-bottom: 8px;
}
.login-card h1 {
  margin: 0 0 6px;
  text-align: center;
  font-size: 22px;
}
.login-card p {
  margin: 0 0 20px;
  text-align: center;
  font-size: 13px;
}
.login-card input {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  margin-bottom: 12px;
  outline: none;
  transition: border-color .15s;
}
.login-card input:focus { border-color: var(--accent); }
.login-card button {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background .15s;
}
.login-card button:hover { background: var(--accent-hover); }
.error-msg { color: var(--danger); font-size: 13px; text-align: center; margin-top: 10px; }

/* ===== App ===== */
.app-view {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px max(12px, env(safe-area-inset-left)) 120px max(12px, env(safe-area-inset-right));
}

.top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  background: var(--bg);
  padding: 8px 0;
  z-index: 10;
}
.brand {
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
}
.search {
  flex: 1;
  min-width: 140px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  outline: none;
  transition: border-color .15s;
}
.search:focus { border-color: var(--accent); }
.device-input {
  padding: 8px 10px;
  width: 110px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  outline: none;
  transition: border-color .15s;
}
.device-input:focus { border-color: var(--accent); }
.icon-btn {
  padding: 7px 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: background .15s, border-color .15s;
  font-size: 14px;
  line-height: 1;
}
.icon-btn:hover { background: var(--accent-soft); border-color: var(--border-hover); }

/* ===== Input ===== */
.input-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}
#text-input {
  width: 100%;
  min-height: 72px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  resize: vertical;
  outline: none;
  transition: border-color .15s;
}
#text-input:focus { border-color: var(--accent); }
.actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.hint {
  flex: 1;
  font-size: 12px;
  color: var(--muted);
}
.btn-primary {
  padding: 8px 18px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background .15s;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: background .15s, border-color .15s;
}
.btn-secondary:hover { background: var(--accent-soft); border-color: var(--border-hover); }

/* ===== Status bar ===== */
.status-bar {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 10px;
  min-height: 16px;
  flex-wrap: wrap;
}
.status-bar.busy::before {
  content: '';
  width: 10px; height: 10px;
  border: 2px solid var(--muted);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .8s linear infinite;
  display: inline-block;
  align-self: center;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Items list ===== */
.items { display: flex; flex-direction: column; gap: 10px; }

.item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .15s, box-shadow .15s;
}
.item:hover { border-color: var(--border-hover); box-shadow: var(--shadow); }
.item.pinned { border-left: 3px solid var(--accent); }
.item.new-flash { animation: flash 1.2s ease-out; }
@keyframes flash {
  0% { background: var(--accent-soft); }
  100% { background: var(--card); }
}

.item-head {
  display: flex;
  gap: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  align-items: center;
}
.item-device::before { content: '📱 '; }
.item-size { margin-left: auto; }
.item-type-badge {
  font-size: 11px;
  padding: 1px 6px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
}

.item-body {
  padding: 12px;
}
.item-body .item-text {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 260px;
  overflow: auto;
  font-size: 13px;
  line-height: 1.55;
}
.item-body .item-text.link-like {
  font-family: inherit;
  color: var(--accent);
  word-break: break-all;
}
.item-body img {
  max-width: 100%;
  max-height: 320px;
  border-radius: var(--radius-sm);
  display: block;
  cursor: zoom-in;
  background: var(--bg);
}
.item-body .filename {
  margin-top: 8px;
  font-size: 13px;
  word-break: break-all;
}
.item-body .file-row {
  display: flex;
  gap: 12px;
  align-items: center;
}
.item-body .file-icon {
  font-size: 36px;
  line-height: 1;
}

.item-actions {
  display: flex;
  gap: 4px;
  padding: 6px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}
.action-btn {
  padding: 5px 12px;
  background: transparent;
  border: 0;
  border-radius: 6px;
  transition: background .15s, color .15s;
  font-size: 13px;
}
.action-btn:hover { background: var(--border); }
.action-btn.danger:hover { background: var(--danger); color: #fff; }
.action-btn.active { color: var(--accent); }

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
  font-size: 14px;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--fg);
  color: var(--bg);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  pointer-events: none;
  z-index: 200;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Preview ===== */
.preview {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  cursor: zoom-out;
}
.preview img {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
}
.preview-close {
  position: absolute;
  top: 16px;
  right: 24px;
  font-size: 36px;
  line-height: 1;
  color: #fff;
  background: transparent;
  border: 0;
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 280;
  padding: 16px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, .2);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  overflow: hidden;
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.modal-head h3 { margin: 0; font-size: 16px; }
.modal-close {
  background: transparent;
  border: 0;
  font-size: 22px;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 8px;
}
.modal-body { padding: 18px; overflow: auto; }
.modal-actions {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  background: var(--bg);
}

.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field > label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.seg button {
  flex: 1;
  min-width: 64px;
  padding: 7px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  cursor: pointer;
  font-size: 13px;
  transition: all .15s;
}
.seg button:hover { border-color: var(--border-hover); }
.seg button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.share-url-row {
  display: flex;
  gap: 6px;
}
.share-url-row input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  min-width: 0;
}
.share-hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

/* ===== Drop overlay ===== */
.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(59, 130, 246, .15);
  border: 3px dashed var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 250;
  pointer-events: none;
}
.drop-msg {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  background: var(--card);
  padding: 20px 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ===== Mobile ===== */
@media (max-width: 640px) {
  .brand-text { display: none; }
  .device-input { width: 80px; }
  .top-bar { gap: 6px; }
  .app-view { padding: 8px; padding-bottom: 120px; }
  .item-body .item-text { font-size: 13px; }
}