/* ===== 基础重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #222632;
  --border: #2a2e3a;
  --text: #e4e6eb;
  --text-dim: #8b8fa3;
  --primary: #4f8cff;
  --primary-hover: #3a7aff;
  --success: #34d399;
  --success-hover: #2bc48a;
  --warning: #fbbf24;
  --danger: #f87171;
  --danger-hover: #ef4444;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

/* ===== Header ===== */
header { text-align: center; margin-bottom: 28px; }
header h1 { font-size: 1.8rem; font-weight: 700; letter-spacing: -0.5px; }
.subtitle { color: var(--text-dim); font-size: 0.95rem; margin-top: 4px; }

/* ===== Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card h2 { font-size: 1.1rem; font-weight: 600; margin-bottom: 14px; color: var(--primary); }

/* ===== 表单元素 ===== */
input[type="text"], input[type="number"], select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 7px 12px;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus { border-color: var(--primary); }

label { font-size: 0.85rem; color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
.checkbox-label { cursor: pointer; }
.checkbox-label input { accent-color: var(--primary); width: 16px; height: 16px; }

/* ===== 按钮 ===== */
.btn {
  border: none;
  border-radius: 6px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  color: #fff;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #111; }
.btn-success:hover:not(:disabled) { background: var(--success-hover); }
.btn-warning { background: var(--warning); color: #111; }
.btn-warning:hover:not(:disabled) { background: #e5a920; }
.btn-danger { background: var(--danger); }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }
.btn-sm {
  padding: 4px 12px;
  font-size: 0.8rem;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s;
}
.btn-sm:hover { background: var(--border); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-dim); }
.btn-outline:hover { background: var(--surface-hover); color: var(--text); }
.btn-group { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

/* ===== 连接面板 ===== */
.filter-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; }
.filter-row label { flex: 1; min-width: 180px; }
.filter-row input[type="text"] { width: 100%; margin-top: 4px; }

.paired-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.paired-row label { flex: 1; min-width: 240px; }
.paired-row select { width: 100%; margin-top: 4px; }

/* ===== 设备信息表 ===== */
.device-info { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.device-info h3 { font-size: 0.95rem; margin-bottom: 10px; color: var(--success); }
.device-info table { width: 100%; border-collapse: collapse; }
.device-info td { padding: 5px 8px; font-size: 0.85rem; border-bottom: 1px solid var(--border); }
.device-info td:first-child { color: var(--text-dim); width: 120px; }

.descriptor-tree { margin-top: 12px; }
.descriptor-tree summary { cursor: pointer; color: var(--primary); font-size: 0.85rem; }
.descriptor-tree pre {
  margin-top: 8px;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
  max-height: 320px;
  overflow-y: auto;
}

/* ===== 配置面板 ===== */
.config-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; margin-bottom: 14px; }
.config-row label { flex: 1; min-width: 130px; }
.config-row select { width: 100%; margin-top: 4px; }

/* ===== 控制传输面板 ===== */
.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}
.control-grid label { flex-direction: column; align-items: stretch; gap: 4px; }
.control-grid input, .control-grid select { width: 100%; }
.ctrl-data-label { display: block; margin-bottom: 12px; }
.ctrl-data-label input { width: 100%; margin-top: 4px; }

/* ===== 通信面板 ===== */
.comm-section { margin-bottom: 18px; }
.comm-section h3 { font-size: 0.95rem; color: var(--text); margin-bottom: 10px; }

.send-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.send-row select { flex-shrink: 0; }
.send-row input { flex: 1; min-width: 160px; }

.send-extras {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 10px;
}
.send-extras label { flex: 1; min-width: 200px; }
.send-extras select { width: 100%; margin-top: 4px; }

.periodic-send {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
  padding: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.quick-send { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

.receive-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.receive-log {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  max-height: 320px;
  overflow-y: auto;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  line-height: 1.7;
}
.receive-log:empty::before { content: '等待接收数据...'; color: var(--text-dim); font-style: italic; }

.log-entry { padding: 3px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.04); }
.log-entry .timestamp { color: var(--text-dim); margin-right: 8px; }
.log-entry .direction { font-weight: 600; margin-right: 6px; }
.log-entry .direction.in { color: var(--success); }
.log-entry .direction.out { color: var(--primary); }
.log-entry .ep-tag { color: var(--text-dim); font-size: 0.75rem; margin-right: 6px; }
.log-entry .data-hex { color: var(--warning); }
.log-entry .data-text { color: var(--text); }

/* ===== 统计栏 ===== */
.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.stats-bar b { color: var(--text); font-weight: 600; }

/* ===== 状态栏 ===== */
.status-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 10px 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}
.status-bar::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.3s;
}
.status-bar.connected::before { background: var(--success); }
.status-bar.error::before { background: var(--danger); }

/* ===== 工具类 ===== */
.hidden { display: none !important; }

/* ===== 滚动条 ===== */
.receive-log::-webkit-scrollbar, .descriptor-tree pre::-webkit-scrollbar { width: 6px; }
.receive-log::-webkit-scrollbar-track, .descriptor-tree pre::-webkit-scrollbar-track { background: transparent; }
.receive-log::-webkit-scrollbar-thumb, .descriptor-tree pre::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .container { padding: 16px 10px 70px; }
  .card { padding: 16px; }
  .filter-row, .send-row { flex-direction: column; align-items: stretch; }
  .control-grid { grid-template-columns: 1fr; }
}