:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  padding: 20px;
  display: flex;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 800px;
}

/* Header 优化 */
.hero {
  text-align: center;
  margin-bottom: 40px;
  margin-top: 20px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* 卡片容器 */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
  border: 1px solid var(--border-color);
}

h2 {
  font-size: 1.25rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 配对区域布局 */
.pairing-grid {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 30px;
}

@media (max-width: 600px) {
  .pairing-grid {
    grid-template-columns: 1fr;
  }
  .pairing-side {
    order: -1; /* 手机端二维码置顶 */
    display: flex;
    justify-content: center;
  }
}

.row {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

label {
  flex: 1;
  display: flex;
  flex-direction: column;
  font-size: 0.875rem;
  color: var(--text-muted);
  gap: 6px;
}

/* 输入框与按钮 */
input[type="text"],
input[type="file"] {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

input:focus {
  border-color: var(--primary-color);
  ring: 2px solid rgba(37, 99, 235, 0.1);
}

button {
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: #fff;
  transition: all 0.2s;
}

button:hover {
  background: #f1f5f9;
}

button.primary {
  background: var(--primary-color);
  color: white;
  border: none;
}

button.primary:hover {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 状态显示 */
.status {
  margin-top: 12px;
  padding: 10px;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 0.875rem;
  text-align: center;
  color: var(--primary-color);
  font-weight: 600;
}

.device-section {
  margin-top: 16px;
}

.device-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.device-list {
  display: grid;
  gap: 10px;
}

.device-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: #f8fafc;
}

.device-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.device-name {
  font-weight: 600;
}

.device-code {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.device-empty {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 8px 0;
}

/* 二维码与扫描 */
.qr-wrap {
  text-align: center;
}

#qr-img {
  background: #f8fafc;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.qr-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* 进度条 */
.progress {
  height: 8px;
  background: #e2e8f0;
  border-radius: 10px;
  overflow: hidden;
  margin: 10px 0;
}

.bar {
  height: 100%;
  width: 0%;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

.progress.secondary .bar {
  background: #10b981; /* 接收用绿色 */
}

.queue {
  margin: 12px 0;
}

.queue-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.queue-list {
  display: grid;
  gap: 10px;
}

.queue-item {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 12px;
  background: #ffffff;
}

.queue-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.queue-name {
  font-weight: 600;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 70%;
}

.queue-status {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.queue-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.queue-item .progress {
  margin: 0;
  height: 6px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 10;
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: 100%;
  max-width: 360px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 18px;
  border: 1px solid var(--border-color);
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.modal-body {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
}

.modal-file {
  font-weight: 600;
}

.modal-meta,
.modal-hash {
  font-size: 0.75rem;
  color: var(--text-muted);
  word-break: break-all;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

button.ghost {
  background: #f1f5f9;
  border: 1px solid var(--border-color);
}

/* 聊天区域 */
.chat {
  margin-top: 24px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.chat-list {
  height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  background: #fcfcfc;
}

.chat-toolbar {
  display: flex;
  gap: 8px;
}

#chat-input {
  flex: 1;
}

.log {
  font-size: 0.75rem;
  color: var(--text-muted);
  max-height: 80px;
  overflow-y: auto;
  margin: 10px 0;
}

/* Responsive layout tweaks */
@media (max-width: 900px) {
  .page {
    max-width: 720px;
  }
}

@media (max-width: 768px) {
  body {
    padding: 16px;
  }

  .hero {
    margin-bottom: 28px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .card {
    padding: 20px;
  }

  .row.actions {
    gap: 10px;
  }

  button {
    padding: 10px 16px;
  }

  .chat-list {
    height: 180px;
  }
}

@media (max-width: 520px) {
  body {
    padding: 12px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .card {
    padding: 16px;
    margin-bottom: 18px;
  }

  h2 {
    font-size: 1.1rem;
    margin-bottom: 14px;
  }

  .row {
    flex-direction: column;
    gap: 10px;
  }

  .row.actions {
    flex-direction: column;
  }

  label {
    width: 100%;
  }

  input[type="text"],
  input[type="file"] {
    width: 100%;
  }

  button {
    width: 100%;
  }

  .pairing-side {
    width: 100%;
  }

  .device-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .chat-toolbar {
    flex-direction: column;
  }

  .chat-list {
    height: 160px;
  }

  .modal-actions {
    flex-direction: column;
  }
}