:root {
  --primary: #4A6FA5;
  --primary-dark: #3a5a87;
  --bg: #f5f5f5;
  --card-radius: 8px;
  --gap: 12px;
  --text: #333;
  --text-light: #888;
  --danger: #d9534f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ---------- 顶部栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--primary);
  color: #fff;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}
.topbar h1 {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
}
.topbar .scene-tag {
  font-size: 12px;
  opacity: 0.85;
  background: rgba(255, 255, 255, 0.18);
  padding: 2px 8px;
  border-radius: 10px;
}

/* ---------- toast ---------- */
.toast-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px 16px;
  text-align: center;
  font-size: 14px;
  color: #fff;
  transform: translateY(-100%);
  transition: transform 0.25s ease;
  pointer-events: none;
}
.toast-bar.show { transform: translateY(0); }
.toast-bar.info { background: #555; }
.toast-bar.error { background: var(--danger); }
.toast-bar.success { background: #5cb85c; }

/* ---------- 网格瀑布流 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  padding: var(--gap);
}
@media (min-width: 600px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .grid { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: #fff;
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  position: relative;
}
.card img {
  display: block;
  width: 100%;
  height: auto;
  min-height: 120px;
  background: #e9edf2;
  object-fit: cover;
}
.card .meta {
  padding: 6px 8px;
  font-size: 12px;
  color: var(--text-light);
  display: flex;
  justify-content: space-between;
}

/* ---------- 加载/空/错误状态 ---------- */
.state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-light);
}
.state svg { max-width: 160px; margin-bottom: 16px; }
.state p { font-size: 15px; margin: 8px 0 16px; }
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 20px;
  font-size: 14px;
}
.btn:active { background: var(--primary-dark); }
.btn.ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn.danger { background: var(--danger); }

.loader {
  text-align: center;
  padding: 20px;
  color: var(--text-light);
  font-size: 13px;
}
.spinner {
  display: inline-block;
  width: 22px;
  height: 22px;
  border: 3px solid #ddd;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 哨兵元素 */
#sentinel { height: 1px; }

/* ---------- 全屏查看弹层 ---------- */
.viewer {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  flex-direction: column;
  touch-action: none;
}
.viewer.open { display: flex; }
.viewer .viewer-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  font-size: 22px;
  line-height: 40px;
}
.viewer .viewer-img-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.viewer .viewer-img-wrap img {
  max-width: 100%;
  max-height: 100%;
  transition: transform 0.15s ease;
}
.viewer .viewer-actions {
  display: flex;
  background: rgba(0, 0, 0, 0.6);
  padding: 12px;
  gap: 10px;
  padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
}
.viewer .viewer-actions button {
  flex: 1;
  border: none;
  border-radius: 6px;
  padding: 12px 0;
  font-size: 15px;
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
}
.viewer .viewer-actions button.del { background: var(--danger); }

/* ---------- 通用弹窗（确认 / action sheet） ---------- */
.mask {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.45);
  display: none;
  align-items: flex-end;
  justify-content: center;
}
.mask.center { align-items: center; }
.mask.open { display: flex; }

.sheet {
  background: #fff;
  width: 100%;
  max-width: 520px;
  border-radius: 14px 14px 0 0;
  padding: 16px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  animation: slideUp 0.2s ease;
}
.mask.center .sheet {
  border-radius: 14px;
  margin: 0 24px;
  animation: none;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
.sheet h3 { margin: 0 0 12px; font-size: 16px; }
.sheet .opt {
  padding: 14px 8px;
  border-top: 1px solid #eee;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sheet .opt:first-of-type { border-top: none; }
.sheet textarea {
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 8px;
  font-size: 14px;
  resize: vertical;
  min-height: 64px;
  margin: 8px 0;
  font-family: inherit;
}
.sheet .sheet-btns {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}
.sheet .sheet-btns button { flex: 1; }
.char-count { font-size: 12px; color: var(--text-light); text-align: right; }

/* ---------- 隐私声明 ---------- */
.privacy {
  background: #fff;
  border-top: 1px solid #eee;
  padding: 12px 16px;
  font-size: 12px;
  color: var(--text-light);
  line-height: 1.7;
}
.privacy summary {
  cursor: pointer;
  color: var(--primary);
  font-size: 13px;
  outline: none;
}
.privacy .phone { color: var(--text); }

/* ---------- 表单（admin） ---------- */
.form-row { margin-bottom: 14px; }
.form-row label {
  display: block;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 6px;
}
.form-row input,
.form-row select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
}
.panel {
  background: #fff;
  border-radius: var(--card-radius);
  padding: 16px;
  margin: var(--gap);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}
.panel h2 { font-size: 16px; margin: 0 0 14px; }

/* 设备表格 */
.dev-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.dev-table th, .dev-table td {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 1px solid #f0f0f0;
}
.dev-table th { color: var(--text-light); font-weight: 600; }
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 5px;
}
.status-online { background: #5cb85c; }
.status-offline { background: #bbb; }
.status-error { background: var(--danger); }

.hidden { display: none !important; }