/* ========== 基础变量 ========== */
:root {
  --bg: #fcfbf9;
  /* Warm Paper */
  --bg-card: #ffffff;
  --bg-hover: #f5f5f4;
  /* Warm tint */
  --text: #292524;
  /* Warm Stone */
  --text-muted: #78716c;
  --border: #e7e5e4;
  /* Stone 200 */
  --primary: #d97706;
  /* Amber 600 */
  --primary-hover: #b45309;
  --primary-light: #fef3c7;
  --success: #15803d;
  /* Green 700 */
  --success-light: #dcfce7;
  --warning: #b45309;
  /* Amber 700 */
  --warning-light: #ffedd5;
  --danger: #b91c1c;
  /* Red 700 */
  --danger-light: #fee2e2;
  --radius: 2px;
  /* Angular */
  --radius-sm: 2px;
  --shadow: 4px 4px 0px rgba(41, 37, 36, 0.1);
  /* Hard Shadow */
  --shadow-lg: 8px 8px 0px rgba(41, 37, 36, 0.1);
  --transition: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #1c1917;
  /* Stone 900 */
  --bg-card: #292524;
  /* Stone 800 */
  --bg-hover: #44403c;
  --text: #f5f5f4;
  /* Stone 100 */
  --text-muted: #a8a29e;
  --border: #44403c;
  --primary-light: #451a03;
  --success-light: #14532d;
  --warning-light: #451a03;
  --danger-light: #450a0a;
  --shadow: 4px 4px 0px rgba(0, 0, 0, 0.5);
  --shadow-lg: 8px 8px 0px rgba(0, 0, 0, 0.5);
}

/* ========== 全局样式 ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.5rem;
  font-weight: 600;
}

h1 {
  font-size: 1.75rem;
}

h2 {
  font-size: 1.25rem;
}

h3 {
  font-size: 1rem;
  color: var(--text-muted);
}

p {
  margin: 0;
}

.muted {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ========== 顶部栏 ========== */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--primary);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background-color: #EEE;
  border-radius: 999px;
  font-size: 0.875rem;
  border: 2px solid #000;
  box-shadow: 2px 2px 0px #000;
  cursor: pointer;
  /* Clickable */
  transition: transform 0.1s;
}

.connection-status:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px #000;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: var(--transition);
}

.connection-status.connected .status-dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.connection-status.connecting .status-dot {
  background: var(--warning);
  animation: pulse 1s infinite;
}

.connection-status.error .status-dot {
  background: var(--danger);
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

.btn-icon {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
}

/* ========== 步骤指示器 ========== */
.steps {
  display: flex;
  justify-content: center;
  gap: 0;
  padding: 1.5rem 1rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0 2rem;
  position: relative;
  opacity: 0.4;
  transition: var(--transition);
}

.step.active,
.step.done {
  opacity: 1;
}

.step:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -1rem;
  top: 12px;
  width: 2rem;
  height: 2px;
  background: var(--border);
}

.step.done:not(:last-child)::after {
  background: var(--primary);
}

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

.step.active .step-num {
  background: var(--primary);
  color: white;
}

.step.done .step-num {
  background: var(--success);
  color: white;
}

.step-label {
  font-size: 0.75rem;
  font-weight: 500;
}

/* ========== 页面容器 ========== */
.pages {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.page {
  display: none;
  padding: 2rem 1rem;
  animation: fadeIn 0.3s ease;
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-content {
  max-width: 800px;
  margin: 0 auto;
}

.page-content.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.page-header {
  text-align: center;
  margin-bottom: 2rem;
}

.page-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

/* ========== 连接页面 ========== */
.connect-card {
  background: var(--bg-card);
  padding: 3rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 400px;
  width: 100%;
}

.connect-card h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.connect-form {
  margin: 2rem 0;
}

.connect-form .label {
  text-align: left;
  display: block;
  margin-bottom: 0.5rem;
}

.error-text {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: 1rem;
}

/* ========== 选题页面 ========== */
.select-controls {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.question-preview {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preview-section {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
}

.preview-section h3 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.topics-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.topic-item {
  padding: 0.75rem 1rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.part2-card {
  background: var(--bg);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--warning);
}

.cue-text {
  font-weight: 500;
  margin-bottom: 1rem;
}

.part2-card ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.part2-card li {
  margin-bottom: 0.25rem;
}

/* ========== 考试页面 ========== */
.exam-header {
  text-align: center;
  margin-bottom: 1rem;
}

.exam-part-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: var(--primary);
  color: white;
  border-radius: 20px;
  font-weight: 600;
  margin-bottom: 1rem;
}

#currentQuestion {
  font-size: 1.25rem;
  color: var(--text);
}

/* 题目详情折叠 */
.question-details {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.question-details summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 500;
  user-select: none;
}

.question-details summary:hover {
  background: var(--bg-hover);
}

.question-detail-content {
  padding: 0 1rem 1rem;
  max-height: 300px;
  overflow-y: auto;
}

.detail-topic {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.detail-topic strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.detail-topic ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.detail-topic li {
  margin-bottom: 0.25rem;
}

.detail-cue {
  padding: 1rem;
  background: var(--warning-light);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.detail-bullets {
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.detail-bullets p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.detail-bullets ul {
  margin: 0;
  padding-left: 1.25rem;
  font-size: 0.875rem;
}

/* 计时器 */
.exam-timers {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.timer {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  font-size: 1.25rem;
}

.timer.prep {
  background: var(--warning-light);
  color: var(--warning);
}

.timer.speak {
  background: var(--success-light);
  color: var(--success);
}

.timer-value {
  font-size: 2rem;
  font-weight: 700;
  min-width: 60px;
  text-align: center;
}

.timer .btn.small {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

/* 波形可视化 */
.exam-visualizer {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.5rem;
}

.waveform {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 60px;
  margin-bottom: 0.5rem;
}

.wave-bar {
  width: 6px;
  height: 20px;
  background: var(--border);
  border-radius: 3px;
  transition: height 0.1s ease;
}

.waveform.active .wave-bar {
  background: var(--primary);
  /* animation: wave 0.5s ease infinite;  Disabled for JS control */
  animation: none;
}

.waveform.active .wave-bar:nth-child(1) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(2) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(3) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(4) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(5) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(6) {
  transition: height 0.05s;
}

.waveform.active .wave-bar:nth-child(7) {
  transition: height 0.05s;
}

@keyframes wave {

  0%,
  100% {
    height: 20px;
  }

  50% {
    height: 50px;
  }
}

.meter {
  width: 100%;
  max-width: 300px;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.meter-bar {
  height: 100%;
  background: var(--primary);
  width: 0%;
  transition: width 0.05s ease;
}

/* 控制按钮 */
.exam-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

/* 状态栏 */
.exam-status-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 0.75rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-item strong {
  color: var(--primary);
}

#recordingIndicator {
  font-size: 1rem;
}

.recording #recordingIndicator {
  color: var(--danger);
  animation: blink 1s infinite;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.3;
  }
}

/* 转写区域 */
.exam-transcript {
  background: var(--bg-card);
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.transcript-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

/* 播放控制 */
.playback-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.range {
  width: 100px;
  cursor: pointer;
}

.pill {
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.125rem 0.5rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* 进度指示 */
.exam-progress {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
}

.progress-parts {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.part-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  opacity: 0.4;
  transition: var(--transition);
}

.part-item.active,
.part-item.done {
  opacity: 1;
}

.part-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.part-item.active .part-num {
  background: var(--primary);
  color: white;
}

.part-item.done .part-num {
  background: var(--success);
  color: white;
}

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

.part-line {
  width: 40px;
  height: 2px;
  background: var(--border);
}

.part-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* ========== 静默提示 ========== */
.silence-warning {
  background: linear-gradient(135deg, var(--warning-light), #fff7ed);
  border: 2px solid var(--warning);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  animation: pulseWarning 2s ease-in-out infinite;
}

.silence-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.silence-icon {
  font-size: 1.5rem;
  animation: shake 0.5s ease-in-out infinite;
}

.silence-text {
  color: var(--text);
  font-weight: 500;
}

.silence-countdown {
  background: var(--warning);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

.btn-small {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
}

@keyframes pulseWarning {

  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4);
  }

  50% {
    box-shadow: 0 0 0 10px rgba(245, 158, 11, 0);
  }
}

@keyframes shake {

  0%,
  100% {
    transform: rotate(0deg);
  }

  25% {
    transform: rotate(-5deg);
  }

  75% {
    transform: rotate(5deg);
  }
}

/* ========== 评分页面 ========== */
.grade-form,
.grade-transcript {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.status-message {
  text-align: center;
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.status-message.loading {
  background: var(--primary-light);
  color: var(--primary);
}

.status-message.error {
  background: var(--danger-light);
  color: var(--danger);
}

.grade-results {
  animation: fadeIn 0.3s ease;
}

.score-hero {
  text-align: center;
  padding: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.score-label {
  display: block;
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.score-value {
  font-size: 4rem;
  font-weight: 700;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.score-card {
  background: var(--bg-card);
  padding: 1rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.score-name {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.score-num {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
}

.feedback-section {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.feedback-section h3 {
  margin-bottom: 0.75rem;
}

.feedback-text {
  color: var(--text);
  line-height: 1.7;
}

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.feedback-card {
  padding: 1rem;
  border-radius: var(--radius-sm);
}

.feedback-card.positive {
  background: var(--success-light);
}

.feedback-card.negative {
  background: var(--danger-light);
}

.feedback-card.neutral {
  background: var(--warning-light);
}

.feedback-card h4 {
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}

.feedback-card ul {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.875rem;
}

.feedback-card li {
  margin-bottom: 0.25rem;
}

/* 详细分析折叠 */
.detail-accordion {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.detail-accordion summary {
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-weight: 500;
}

.detail-accordion summary:hover {
  background: var(--bg-hover);
  border-radius: var(--radius);
}

.detail-content {
  padding: 0 1.5rem 1.5rem;
}

.detail-section {
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.detail-section h4 {
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}

.detail-section p {
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.detail-section ul {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.875rem;
}

/* ========== 日志面板 ========== */
.log-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  transition: height 0.3s ease;
  z-index: 50;
}

.log-panel.collapsed {
  height: 40px;
}

.log-panel.collapsed .log-content {
  display: none;
}

.log-toggle {
  width: 100%;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.log-content {
  height: 200px;
  padding: 0.5rem 1rem;
}

.log-box {
  height: 100%;
  overflow-y: auto;
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.log-box div {
  padding: 0.125rem 0;
}

/* ========== 通用组件 ========== */
.label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.input,
.textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 2px solid var(--border);
  /* Thicker border */
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  transition: var(--transition);
}

.input:focus,
.textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 4px 4px 0px var(--primary-light);
  /* Hard focus shadow */
}

.textarea {
  resize: vertical;
  font-family: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-card);
  color: var(--text);
  border: 2px solid var(--border);
  /* Thicker border */
  position: relative;
  top: 0;
  left: 0;
}

.btn:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--text);
  box-shadow: 2px 2px 0px var(--text);
  /* Hard shadow */
  transform: translate(-1px, -1px);
}

.btn:active:not(:disabled) {
  transform: translate(1px, 1px);
  box-shadow: 0px 0px 0px var(--text);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--bg);
}

.btn.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn.primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.2);
}

.btn.primary:active:not(:disabled) {
  transform: translate(1px, 1px);
  box-shadow: none;
}

.btn.large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn.small {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

/* 呼吸动画按钮 */
.btn.breathing:not(:disabled) {
  animation: breathing 2s ease infinite;
}

@keyframes breathing {

  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
  }

  50% {
    box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
  }
}

.btn.pulse-ready {
  animation: breathing 2s ease infinite;
}

.btn-loading {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.btn.loading .btn-text {
  display: none;
}

.btn.loading .btn-loading {
  display: block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.hidden {
  display: none !important;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .topbar {
    padding: 0.5rem 1rem;
  }

  .logo {
    font-size: 1rem;
  }

  .steps {
    padding: 1rem 0.5rem;
  }

  .step {
    padding: 0 1rem;
  }

  .step-label {
    display: none;
  }

  .step:not(:last-child)::after {
    right: -0.5rem;
    width: 1rem;
  }

  .page {
    padding: 1rem 0.75rem;
  }

  .connect-card {
    padding: 2rem 1.5rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .feedback-grid {
    grid-template-columns: 1fr;
  }

  .exam-status-bar {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .playback-controls {
    flex-direction: column;
    gap: 1rem;
  }

  .timer {
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }

  .timer-value {
    font-size: 1.5rem;
    min-width: 40px;
  }
}

/* ========== 动画类 ========== */
.shake {
  animation: shake 0.5s ease;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-5px);
  }

  75% {
    transform: translateX(5px);
  }
}

.bounce {
  animation: bounce 0.5s ease;
}

@keyframes bounce {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* ========== 麦克风测试 ========== */
.mic-test-section {
  background: var(--bg);
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin: 1rem 0;
  border: 1px solid var(--border);
}

.mic-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mic-meter-container {
  flex: 1;
  height: 10px;
  background: var(--border);
  border-radius: 5px;
  overflow: hidden;
  position: relative;
}

.mic-meter-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--success), var(--warning));
  transition: width 0.05s ease;
  border-radius: 5px;
}

.mic-status {
  text-align: center;
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

.mic-status.success {
  color: var(--success);
  font-weight: 600;
}

/* ========== Notice Card ========== */
.subtitle-zh {
  font-family: "Work Sans", "Noto Sans SC", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin: -0.5rem 0 1rem 0;
  color: var(--primary);
}

.notice-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 2rem;
  box-shadow: var(--shadow-sm);
}

.notice-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.notice-icon {
  font-size: 1.2rem;
}

.notice-header h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.notice-body p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.notice-action {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  background: var(--bg);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.link-highlight {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
}

.link-highlight:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}