:root {
  --primary-color: #1677FF;
  --primary-hover: #4096FF;
  --success-color: #52C41A;
  --warning-color: #FAAD14;
  --error-color: #FF4D4F;
  --text-main: #000000E0;
  --text-secondary: #000000A6;
  --text-tertiary: #00000073;
  --bg-body: #F5F7FA;
  --bg-card: #FFFFFF;
  --border-color: #D9D9D9;
  --radius-base: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.08);
  --font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5715;
  font-size: 14px;
  min-height: 100vh;
  padding: 40px 20px;
}

.container {
  max-width: 480px;
  margin: 0 auto;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-tertiary);
  font-size: 14px;
}

/* Section Common */
.section {
  margin-bottom: 24px;
}

.section-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding-left: 4px;
}

/* Mode Selector (Cards) */
.mode-selector {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.mode-btn {
  background: var(--bg-card);
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-card);
}

.mode-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.mode-btn.active {
  border-color: var(--primary-color);
  background-color: #E6F4FF; /* Very light blue */
}

.mode-btn .icon {
  font-size: 24px;
  margin-bottom: 8px;
}

.mode-btn .label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
}

.mode-btn .desc {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.mode-btn.active .label {
  color: var(--primary-color);
}

/* Config Cards */
.settings-panel.hidden {
  display: none;
}

.config-card {
  background: var(--bg-card);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-card);
  margin-bottom: 16px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.config-card:hover {
  box-shadow: var(--shadow-hover);
}

.config-header {
  padding: 16px;
  border-bottom: 1px solid #F0F0F0;
  display: flex;
  align-items: center;
  background: #FAFAFA;
}

.config-icon {
  font-size: 18px;
  margin-right: 10px;
}

.config-label {
  font-weight: 500;
  color: var(--text-main);
  font-size: 15px;
}

.config-body {
  padding: 20px;
}

/* Form Elements */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.setting-row:last-child {
  margin-bottom: 0;
}

.setting-row.conditional {
  background: #FAFAFA;
  margin: 0 -20px -20px -20px;
  padding: 16px 20px;
  border-top: 1px dashed #F0F0F0;
}

.setting-row.conditional.hidden {
  display: none;
}

.setting-row label {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Radio Group */
.radio-group {
  display: flex;
  gap: 16px;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--text-main);
  font-size: 14px;
}

.radio-group input[type="radio"] {
  accent-color: var(--primary-color);
  width: 16px;
  height: 16px;
}

select {
  appearance: none;
  background-color: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 32px 8px 12px;
  font-size: 14px;
  color: var(--text-main);
  outline: none;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 140px;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23000000' stroke-opacity='0.25' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

select:hover {
  border-color: var(--primary-color);
}

select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.2);
}

/* Voice Grid */
.voice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.voice-option {
  cursor: pointer;
}

.voice-option input {
  display: none;
}

.voice-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  background: #FAFAFA;
}

.voice-option input:checked + .voice-card {
  border-color: var(--primary-color);
  background-color: #E6F4FF;
}

.voice-avatar {
  font-size: 24px;
  margin-bottom: 6px;
}

.voice-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
}

.voice-type {
  font-size: 11px;
  color: var(--text-tertiary);
}

/* Textarea */
#system-prompt {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-main);
  outline: none;
  transition: all 0.2s;
  min-height: 120px;
  resize: vertical;
}

#system-prompt:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.2);
}

.prompt-tips {
  margin-top: 12px;
  padding: 12px;
  background: #FFFBE6; /* Light yellow for tips */
  border: 1px solid #FFE58F;
  border-radius: var(--radius-sm);
  color: #D48806;
  font-size: 12px;
}

.prompt-tips ul {
  padding-left: 20px;
  margin-top: 6px;
}

/* Action Area */
.action-area {
  margin-top: 40px;
  text-align: center;
}

.save-btn {
  background: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 24px; /* Pill shape */
  padding: 12px 64px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(22, 119, 255, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.save-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(22, 119, 255, 0.4);
}

.save-btn:active {
  transform: translateY(1px);
}

.save-btn.success {
  background: var(--success-color);
  box-shadow: 0 4px 12px rgba(82, 196, 26, 0.3);
}

.save-hint {
  height: 24px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.save-hint.success {
  color: var(--success-color);
}

/* Status Panel */
.device-status {
  margin-top: 40px;
  background: transparent;
  border-top: 1px solid #E8E8E8;
  padding-top: 20px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 13px;
}

.status-label {
  color: var(--text-tertiary);
}

.status-value {
  color: var(--text-secondary);
  font-weight: 500;
}

.status-value.connected {
  color: var(--success-color);
}

.status-value.disconnected {
  color: var(--text-tertiary);
}

@media (max-width: 480px) {
  body {
    padding: 20px 16px;
  }

  .mode-selector {
    gap: 8px;
  }

  .mode-btn {
    padding: 12px 4px;
  }

  .voice-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Login Gate */
.login-gate {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-body);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.login-gate.hidden {
  display: none;
}

.login-box {
  background: var(--bg-card);
  padding: 40px;
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-hover);
  text-align: center;
  max-width: 320px;
  width: 90%;
}

.login-box h2 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text-main);
}

.login-box p {
  color: var(--text-tertiary);
  font-size: 14px;
  margin-bottom: 24px;
}

.login-box input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 16px;
  outline: none;
  margin-bottom: 16px;
  transition: all 0.2s;
}

.login-box input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.2);
}

.login-box button {
  width: 100%;
  padding: 12px;
  background: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.login-error {
  color: var(--error-color) !important;
  font-size: 13px !important;
  margin-top: 12px !important;
  margin-bottom: 0 !important;
  min-height: 20px;
}