/* ================================================================
   在线水平测试插件 — Material Design 3 Academic Theme
   Color: Deep Navy #031636 + Gold #775928
   Font: Noto Serif (headline) + Inter (body)
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif:wght@400;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --st-primary: #031636;
    --st-primary-container: #1a2b4c;
    --st-on-primary: #ffffff;
    --st-secondary: #775928;
    --st-secondary-hover: #8e6b30;
    --st-secondary-container: #ffd79b;
    --st-on-secondary: #ffffff;
    --st-surface: #f9f9f9;
    --st-surface-dim: #dadada;
    --st-surface-container: #eeeeee;
    --st-surface-container-low: #f3f3f3;
    --st-surface-container-high: #e8e8e8;
    --st-surface-lowest: #ffffff;
    --st-text: #1a1c1c;
    --st-text-2: #44474e;
    --st-text-3: #75777f;
    --st-outline: #c5c6cf;
    --st-success: #16a34a;
    --st-success-light: #f0fdf4;
    --st-danger: #ba1a1a;
    --st-danger-light: #ffdad6;
    --st-warning: #775928;
    --st-warning-light: #ffdeae;
    --st-radius: 0.75rem;
    --st-radius-sm: 0.5rem;
    --st-radius-xs: 0.25rem;
    --st-shadow: 0 1px 3px rgba(0,0,0,0.05);
    --st-shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --st-shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --st-font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    --st-font-headline: 'Noto Serif', Georgia, "Times New Roman", serif;
}

#skill-test-app {
    font-family: var(--st-font-body) !important;
    max-width: 860px;
    margin: 0 auto;
    padding: 24px 16px;
    color: var(--st-text) !important;
    line-height: 1.7 !important;
    font-size: 15px !important;
    background: transparent;
}

#skill-test-app * { box-sizing: border-box; }
.skill-test-section { display: none; }
.skill-test-section.skill-test-active { display: block; }

/* ========== Hero 区域 ========== */
.st-hero {
    text-align: center;
    padding: 48px 24px 40px;
    background: var(--st-primary-container);
    border-radius: var(--st-radius);
    color: var(--st-on-primary);
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.st-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -15%;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    pointer-events: none;
}

.st-hero::after {
    content: '';
    position: absolute;
    bottom: -25%;
    left: -8%;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(255,255,255,0.03);
    pointer-events: none;
}

.st-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: var(--st-secondary);
    border-radius: 50px;
    font-size: 11px !important;
    font-weight: 700 !important;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
    color: var(--st-on-secondary);
}

.st-hero-title {
    font-family: var(--st-font-headline) !important;
    font-size: 2.4rem !important;
    font-weight: 700 !important;
    margin: 0 0 14px !important;
    letter-spacing: 0.01em;
    position: relative;
    z-index: 1;
}

.st-hero-desc {
    font-size: 1rem !important;
    opacity: 0.8;
    line-height: 1.9 !important;
    margin: 0 !important;
    position: relative;
    z-index: 1;
    max-width: 520px;
    margin-left: auto !important;
    margin-right: auto !important;
}

/* ========== 报告预览区 ========== */
.st-preview-section {
    background: var(--st-surface-lowest);
    border-radius: var(--st-radius);
    padding: 32px 28px;
    box-shadow: var(--st-shadow);
    margin-bottom: 20px;
    border: 1px solid var(--st-outline);
}

.st-preview-header { text-align: center; margin-bottom: 24px; }

.st-preview-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--st-secondary-container);
    color: var(--st-secondary);
    border-radius: 50px;
    font-size: 10px !important;
    font-weight: 700 !important;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.st-preview-title {
    font-family: var(--st-font-headline) !important;
    font-size: 1.5rem !important;
    font-weight: 700 !important;
    color: var(--st-primary) !important;
    margin: 0 !important;
}

/* 得分环 */
.st-preview-scores { display: flex; justify-content: center; gap: 32px; margin-bottom: 28px; }
.st-preview-score-item { text-align: center; }

.st-score-ring { width: 80px; height: 80px; position: relative; margin: 0 auto 8px; }
.st-score-ring svg { width: 100%; height: 100%; }

.st-score-num {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    font-size: 15px !important; font-weight: 800 !important; color: var(--st-primary) !important;
}

.st-score-label {
    font-size: 11px !important; color: var(--st-text-3) !important;
    font-weight: 600 !important; text-transform: uppercase; letter-spacing: 0.08em;
}

/* 雷达图预览 */
.st-preview-radar {
    text-align: center; margin-bottom: 24px;
    padding: 16px; background: var(--st-surface-container-low); border-radius: var(--st-radius-sm);
}

.st-preview-radar svg { max-width: 320px; margin: 0 auto; display: block; }

/* 功能亮点 */
.st-preview-features { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.st-feature-card {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 16px; background: var(--st-surface-container-low);
    border-radius: var(--st-radius-sm); transition: all 0.2s;
    border: 1px solid transparent;
}

.st-feature-card:hover {
    border-color: var(--st-outline);
    box-shadow: var(--st-shadow);
}

.st-feature-icon {
    width: 40px; height: 40px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}

.st-feature-info { display: flex; flex-direction: column; }
.st-feature-info strong { font-size: 13px !important; font-weight: 700 !important; color: var(--st-text) !important; }
.st-feature-info span { font-size: 11px !important; color: var(--st-text-3) !important; margin-top: 1px; }

/* ========== AI 声明 ========== */
.st-ai-badge-section { margin-bottom: 20px; }

.st-ai-badge {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 14px 18px;
    background: var(--st-warning-light);
    border: 1px solid var(--st-secondary-container);
    border-radius: var(--st-radius-sm);
    font-size: 12px !important; color: var(--st-secondary) !important; line-height: 1.8 !important;
}

.st-ai-badge svg { color: var(--st-secondary); margin-top: 2px; flex-shrink: 0; }

/* ========== 表单区域 ========== */
.st-form-section {
    background: var(--st-surface-lowest);
    border-radius: var(--st-radius);
    padding: 32px 28px;
    box-shadow: var(--st-shadow);
    border: 1px solid var(--st-outline);
    margin-bottom: 20px;
}

/* 步骤指示器 */
.st-form-header { margin-bottom: 28px; }

.st-step-indicator {
    display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
}

.st-step {
    display: flex; align-items: center; gap: 6px;
    font-size: 12px !important; color: var(--st-text-3) !important;
    font-weight: 600 !important; white-space: nowrap; letter-spacing: 0.02em;
}

.st-step span {
    display: inline-flex; align-items: center; justify-content: center;
    width: 22px; height: 22px; border-radius: 50%;
    background: var(--st-surface-container-high); color: var(--st-text-3);
    font-size: 10px !important; font-weight: 700 !important;
}

.st-step.active { color: var(--st-secondary) !important; }
.st-step.active span { background: var(--st-secondary); color: var(--st-on-secondary); }

.st-step-line { width: 20px; height: 1.5px; background: var(--st-outline); margin: 0 6px; }

/* 表单 */
.st-form { display: flex; flex-direction: column; gap: 18px; }
.st-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.st-form-field label {
    display: block; margin-bottom: 6px;
    font-size: 11px !important; font-weight: 600 !important;
    color: var(--st-text-2) !important; text-transform: uppercase;
    letter-spacing: 0.1em;
}

.st-required { color: var(--st-danger) !important; }

.st-form-field input,
.st-form-field select {
    width: 100% !important; padding: 12px 16px !important;
    border: none !important; border-radius: var(--st-radius-sm) !important;
    font-size: 14px !important; font-family: var(--st-font-body) !important;
    background: var(--st-surface-container-low) !important;
    color: var(--st-text) !important; height: auto !important; outline: none !important;
    transition: all 0.2s;
}

.st-form-field input:focus,
.st-form-field select:focus {
    background: var(--st-surface-lowest) !important;
    box-shadow: 0 0 0 2px rgba(119,89,40,0.2) !important;
}

.st-form-field input::placeholder { color: var(--st-text-3) !important; }

/* 提交按钮 */
.st-submit-btn {
    display: flex !important; align-items: center; justify-content: center;
    width: 100% !important; padding: 15px 24px !important;
    background: var(--st-primary) !important; color: var(--st-on-primary) !important;
    border: none !important; border-radius: var(--st-radius-sm) !important;
    font-size: 1rem !important; font-weight: 700 !important;
    font-family: var(--st-font-body) !important; cursor: pointer;
    transition: all 0.2s; letter-spacing: 0.02em;
}

.st-submit-btn:hover { background: var(--st-primary-container) !important; }
.st-submit-btn:active { transform: scale(0.98); }
.st-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.st-form-hint {
    text-align: center; font-size: 12px !important;
    color: var(--st-text-3) !important; margin: 0 !important;
}

/* ========== 错误提示 ========== */
.skill-test-error {
    background: var(--st-danger-light) !important; color: var(--st-danger) !important;
    padding: 12px 16px; border-radius: var(--st-radius-sm); font-size: 13px !important;
}

/* ========== 加载动画 ========== */
.skill-test-loading-container { text-align: center; padding: 60px 20px; }

.skill-test-spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--st-outline); border-top-color: var(--st-secondary);
    border-radius: 50%; animation: st-spin 0.7s linear infinite; margin: 0 auto 20px;
}

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

.skill-test-loading-text { color: var(--st-text-2) !important; font-size: 1rem !important; }

/* 出题进度步骤 */
.skill-test-loading-steps { max-width: 380px; margin: 28px auto 0; text-align: left; }

.skill-test-loading-step {
    display: flex; align-items: center; gap: 12px; padding: 10px 0;
    font-size: 14px !important; color: var(--st-text-3) !important; transition: color 0.3s;
}

.skill-test-loading-step.active { color: var(--st-secondary) !important; font-weight: 600 !important; }
.skill-test-loading-step.done { color: var(--st-success) !important; }

.skill-test-step-icon {
    width: 26px; height: 26px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 11px !important; font-weight: 700 !important; flex-shrink: 0;
    background: var(--st-surface-container); color: var(--st-text-3);
    border: 2px solid var(--st-outline); transition: all 0.3s;
}

.skill-test-loading-step.active .skill-test-step-icon {
    background: var(--st-secondary); color: #fff; border-color: var(--st-secondary);
    animation: st-spin 1.5s linear infinite;
}

.skill-test-loading-step.done .skill-test-step-icon {
    background: var(--st-success); color: #fff; border-color: var(--st-success); animation: none;
}

/* ========== 报告生成进度（双栏布局） ========== */
.st-report-loading-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
    padding: 20px 0;
}

.st-rload-left { padding: 24px 0; }
.st-rload-right { position: sticky; top: 80px; }

/* 海报卡片 */
.st-rload-poster-card {
    background: var(--st-surface-lowest);
    border: 1px solid var(--st-outline);
    border-radius: var(--st-radius);
    overflow: hidden;
    box-shadow: var(--st-shadow-md);
}

.st-rload-poster-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--st-radius);
}

/* 无海报时的降级样式 */
.st-rload-poster-fallback {
    text-align: center;
    padding: 36px 24px;
}

.st-rload-poster-icon {
    width: 72px; height: 72px;
    border-radius: 50%;
    background: var(--st-warning-light);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px;
}

.st-rload-poster-fallback h4 {
    font-family: var(--st-font-headline) !important;
    font-size: 1.2rem !important;
    font-weight: 700 !important;
    color: var(--st-primary) !important;
    margin: 0 0 8px !important;
}

.st-rload-poster-fallback p {
    font-size: 14px !important;
    color: var(--st-text-2) !important;
    margin: 0 0 20px !important;
    line-height: 1.7 !important;
}

.st-rload-qr-img {
    width: 160px; height: 160px;
    border-radius: 8px;
    margin: 0 auto 8px;
    display: block;
    border: 1px solid var(--st-outline);
}

.st-rload-qr-hint {
    font-size: 12px !important;
    color: var(--st-text-3) !important;
    display: block;
}

/* 旧的单栏兼容 */
.st-report-loading { max-width: 480px; margin: 0 auto; padding: 48px 20px; }

.st-report-loading-header { text-align: center; margin-bottom: 32px; }
.st-report-loading-header h3 {
    font-family: var(--st-font-headline) !important;
    font-size: 1.4rem !important; font-weight: 700 !important;
    color: var(--st-primary) !important; margin: 0 0 8px !important;
}
.st-report-loading-header p { font-size: 13px !important; color: var(--st-text-2) !important; margin: 0 !important; }

.st-report-steps { display: flex; flex-direction: column; }

.st-report-step {
    display: flex; align-items: center; gap: 14px;
    padding: 14px 16px; border-left: 2px solid var(--st-outline);
    margin-left: 14px; transition: all 0.3s; position: relative;
}

.st-report-step:last-child { border-left-color: transparent; }

.st-rstep-icon {
    width: 28px; height: 28px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px !important; font-weight: 700 !important;
    background: var(--st-surface-container); color: var(--st-text-3);
    border: 2px solid var(--st-outline); flex-shrink: 0;
    position: relative; left: -22px; transition: all 0.3s;
}

.st-rstep-info { display: flex; flex-direction: column; margin-left: -8px; }
.st-rstep-info strong { font-size: 13px !important; color: var(--st-text-2) !important; transition: color 0.3s; }
.st-rstep-info span { font-size: 11px !important; color: var(--st-text-3) !important; }

.st-report-step.active { border-left-color: var(--st-secondary); }
.st-report-step.active .st-rstep-icon { background: var(--st-secondary); color: #fff; border-color: var(--st-secondary); animation: st-spin 1.5s linear infinite; }
.st-report-step.active .st-rstep-info strong { color: var(--st-secondary) !important; }
.st-report-step.done { border-left-color: var(--st-success); }
.st-report-step.done .st-rstep-icon { background: var(--st-success); color: #fff; border-color: var(--st-success); animation: none; }
.st-report-step.done .st-rstep-info strong { color: var(--st-success) !important; }

/* ========== 答题页 ========== */
.skill-test-exam-container { position: relative; }

.skill-test-exam-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px; background: var(--st-surface-lowest);
    border-radius: var(--st-radius); box-shadow: var(--st-shadow);
    margin-bottom: 20px; position: sticky; top: 0; z-index: 10;
    border: 1px solid var(--st-outline);
}

.skill-test-timer {
    font-size: 1.4rem !important; font-weight: 700 !important;
    color: var(--st-primary) !important; min-width: 100px;
    font-family: var(--st-font-body) !important;
}

.skill-test-timer.warning { color: var(--st-danger) !important; animation: st-pulse 1s infinite; }
@keyframes st-pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }

.skill-test-progress { flex: 1; margin-left: 24px; }
#skill-test-progress-text { font-size: 12px !important; color: var(--st-text-3) !important; margin-bottom: 6px; display: block; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600 !important; }
.skill-test-progress-bar { height: 5px; background: var(--st-surface-container); border-radius: 3px; overflow: hidden; }
.skill-test-progress-fill { height: 100%; background: var(--st-secondary); border-radius: 3px; transition: width 0.3s; }

.skill-test-question-area {
    background: var(--st-surface-lowest); border-radius: var(--st-radius);
    padding: 32px; box-shadow: var(--st-shadow); margin-bottom: 20px; min-height: 260px;
    border: 1px solid var(--st-outline);
}

.skill-test-question-info { display: flex; gap: 8px; margin-bottom: 16px; }

.skill-test-question-module,
.skill-test-question-difficulty {
    display: inline-block; padding: 3px 12px; border-radius: 50px;
    font-size: 10px !important; font-weight: 700 !important;
    text-transform: uppercase; letter-spacing: 0.08em;
}

.skill-test-question-module { background: #d8e2ff; color: var(--st-primary); }
.skill-test-question-difficulty { background: var(--st-success-light); color: var(--st-success); }
.skill-test-question-difficulty.hard { background: var(--st-danger-light); color: var(--st-danger); }
.skill-test-question-difficulty.medium { background: var(--st-warning-light); color: var(--st-secondary); }

.skill-test-question-stem { font-size: 1.2rem !important; line-height: 2 !important; margin-bottom: 28px; }
.skill-test-option-text .katex { font-size: 1.15em; }
.skill-test-question-stem .katex { font-size: 1.2em; }

.skill-test-options { display: flex; flex-direction: column; gap: 8px; }

.skill-test-option {
    display: flex; align-items: flex-start; padding: 13px 16px;
    border: 1px solid var(--st-outline); border-radius: var(--st-radius-sm);
    cursor: pointer; transition: all 0.15s; background: var(--st-surface-container-low);
}

.skill-test-option:hover { border-color: var(--st-secondary); background: var(--st-warning-light); }
.skill-test-option.selected { border-color: var(--st-secondary); background: var(--st-warning-light); }

.skill-test-option-letter {
    width: 34px; height: 34px; border-radius: 50%;
    background: var(--st-surface-container); display: flex; align-items: center; justify-content: center;
    font-weight: 700 !important; font-size: 15px !important; margin-right: 14px; flex-shrink: 0;
    color: var(--st-text-2);
}

.skill-test-option.selected .skill-test-option-letter { background: var(--st-secondary); color: #fff; }
.skill-test-option-text { flex: 1; line-height: 1.7 !important; padding-top: 3px; font-size: 1.1rem !important; }

.skill-test-exam-footer { margin-bottom: 20px; }
.skill-test-nav-buttons { display: flex; justify-content: center; gap: 12px; }

.skill-test-btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 11px 24px; border: none; border-radius: var(--st-radius-sm);
    font-size: 14px !important; font-weight: 600 !important; cursor: pointer;
    transition: all 0.15s; min-width: 120px; font-family: var(--st-font-body) !important;
}

.skill-test-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.skill-test-btn-primary { background: var(--st-primary) !important; color: var(--st-on-primary) !important; }
.skill-test-btn-primary:hover:not(:disabled) { background: var(--st-primary-container) !important; }
.skill-test-btn-outline { background: transparent !important; color: var(--st-primary) !important; border: 1.5px solid var(--st-primary) !important; }
.skill-test-btn-outline:hover:not(:disabled) { background: var(--st-primary) !important; color: #fff !important; }
.skill-test-btn-submit { background: var(--st-secondary) !important; color: #fff !important; }
.skill-test-btn-submit:hover { background: var(--st-secondary-hover) !important; }

/* 答题卡 */
.skill-test-answer-card {
    background: var(--st-surface-lowest); border-radius: var(--st-radius);
    padding: 20px; box-shadow: var(--st-shadow); border: 1px solid var(--st-outline);
}

.skill-test-answer-card h4 {
    margin: 0 0 12px; font-size: 10px !important; color: var(--st-text-3) !important;
    text-transform: uppercase; letter-spacing: 0.12em; font-weight: 700 !important;
}

.skill-test-answer-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 6px; }

.skill-test-answer-cell {
    width: 38px; height: 38px; border-radius: var(--st-radius-xs);
    display: flex; align-items: center; justify-content: center;
    font-weight: 600 !important; font-size: 12px !important; cursor: pointer;
    background: var(--st-surface-container); color: var(--st-text-3);
    border: 1.5px solid transparent; transition: all 0.15s;
}

.skill-test-answer-cell.answered { background: var(--st-success-light); color: var(--st-success); border-color: var(--st-success); }
.skill-test-answer-cell.current { background: var(--st-secondary-container); color: var(--st-secondary); border-color: var(--st-secondary); }

/* ========== 报告页 ========== */
.skill-test-report-container { max-width: 800px; margin: 0 auto; }
.skill-test-report-summary { text-align: center; margin-bottom: 28px; }

.skill-test-title {
    font-family: var(--st-font-headline) !important;
    font-size: 1.8rem !important; font-weight: 700 !important;
    text-align: center; color: var(--st-primary) !important; margin-bottom: 8px !important;
}

.skill-test-subtitle {
    text-align: center; color: var(--st-text-2) !important; font-size: 0.95rem !important;
}

.skill-test-score-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 24px; }

.skill-test-score-card {
    background: var(--st-surface-lowest); border-radius: var(--st-radius-sm);
    padding: 20px 12px; box-shadow: var(--st-shadow); text-align: center;
    border-bottom: 3px solid var(--st-secondary-container);
}

.skill-test-score-value {
    font-family: var(--st-font-headline) !important;
    font-size: 1.5rem !important; font-weight: 700 !important; color: var(--st-primary) !important;
}

.skill-test-score-label {
    font-size: 10px !important; color: var(--st-text-3) !important; margin-top: 4px;
    text-transform: uppercase; letter-spacing: 0.1em; font-weight: 600 !important;
}

.skill-test-report-section {
    background: var(--st-surface-lowest); border-radius: var(--st-radius);
    padding: 24px; margin-bottom: 14px; box-shadow: var(--st-shadow);
    border: 1px solid var(--st-outline);
}

.skill-test-report-section h3 {
    font-family: var(--st-font-headline) !important;
    font-size: 1.1rem !important; margin: 0 0 16px !important;
    padding-bottom: 12px; border-bottom: 1px solid var(--st-surface-container);
    color: var(--st-primary) !important;
}

.skill-test-radar-container { max-width: 380px; margin: 0 auto; }

.skill-test-module-item { padding: 14px 0; border-bottom: 1px solid var(--st-surface-container); }
.skill-test-module-item:last-child { border-bottom: none; }
.skill-test-module-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.skill-test-module-name { font-weight: 600 !important; font-size: 14px !important; }
.skill-test-module-rate { font-weight: 700 !important; color: var(--st-secondary) !important; font-size: 14px !important; }
.skill-test-module-bar { height: 5px; background: var(--st-surface-container); border-radius: 3px; overflow: hidden; margin-bottom: 6px; }
.skill-test-module-bar-fill { height: 100%; border-radius: 3px; transition: width 0.5s; }
.skill-test-module-suggestion { font-size: 12px !important; color: var(--st-text-3) !important; font-style: italic; }

/* 逐题回顾 */
.skill-test-review-item {
    padding: 16px; border: 1px solid var(--st-outline);
    border-radius: var(--st-radius-sm); margin-bottom: 10px;
    background: var(--st-surface-container-low);
}
.skill-test-review-item.correct { border-left: 3px solid var(--st-success); }
.skill-test-review-item.wrong { border-left: 3px solid var(--st-danger); }
.skill-test-review-header { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 13px !important; }
.skill-test-review-status { font-weight: 700 !important; font-size: 12px !important; text-transform: uppercase; letter-spacing: 0.05em; }
.skill-test-review-status.correct { color: var(--st-success) !important; }
.skill-test-review-status.wrong { color: var(--st-danger) !important; }
.skill-test-review-answers { font-size: 13px !important; color: var(--st-text-2) !important; margin: 8px 0; }
.skill-test-review-explanation { background: var(--st-surface-container); padding: 12px; border-radius: var(--st-radius-xs); font-size: 13px !important; margin-top: 8px; }

/* ========== 弹窗 ========== */
.skill-test-modal {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.45); display: flex; align-items: center; justify-content: center;
    z-index: 99999; padding: 20px; backdrop-filter: blur(4px);
}

.skill-test-modal-content {
    background: var(--st-surface-lowest); border-radius: var(--st-radius);
    padding: 36px; max-width: 400px; width: 100%;
    box-shadow: var(--st-shadow-lg); text-align: center; position: relative;
}

.skill-test-modal-close {
    position: absolute; top: 12px; right: 16px;
    background: none; border: none; font-size: 1.4rem;
    color: var(--st-text-3); cursor: pointer;
}

.skill-test-modal-buttons { display: flex; justify-content: center; gap: 12px; margin-top: 24px; }
.skill-test-qrcode-img { width: 180px; height: 180px; margin: 20px auto; display: block; border-radius: var(--st-radius-sm); }
.skill-test-qrcode-hint { color: var(--st-text-3) !important; font-size: 12px !important; }

.skill-test-float-btn {
    position: fixed; bottom: 24px; right: 24px;
    background: var(--st-secondary); color: #fff; padding: 12px 24px;
    border-radius: 50px; box-shadow: var(--st-shadow-lg); cursor: pointer;
    font-weight: 600 !important; font-size: 13px !important; z-index: 9999;
    transition: transform 0.2s; letter-spacing: 0.03em;
}

.skill-test-float-btn:hover { transform: scale(1.05); background: var(--st-secondary-hover); }

/* ========== 响应式 ========== */
@media (max-width: 640px) {
    .st-report-loading-split { grid-template-columns: 1fr; }
    .st-rload-right { position: static; }
    #skill-test-app { padding: 12px 10px; }
    .st-hero { padding: 32px 16px 28px; }
    .st-hero-title { font-size: 1.7rem !important; }
    .st-preview-section, .st-form-section { padding: 22px 16px; }
    .st-preview-scores { gap: 16px; }
    .st-score-ring { width: 64px; height: 64px; }
    .st-preview-features { grid-template-columns: 1fr; }
    .st-form-row { grid-template-columns: 1fr; gap: 10px; }
    .st-step-indicator { gap: 2px; }
    .st-step { font-size: 10px !important; }
    .st-step-line { width: 10px; }
    .skill-test-exam-header { flex-direction: column; gap: 12px; }
    .skill-test-progress { margin-left: 0; }
    .skill-test-score-cards { grid-template-columns: repeat(2, 1fr); }
    .skill-test-nav-buttons { flex-direction: column; }
    .skill-test-nav-buttons .skill-test-btn { width: 100%; }
    .skill-test-question-area { padding: 20px 16px; }
}