/* === about.html 介绍页样式 === */

:root {
    --color-primary: #a78bfa;
    --color-primary-dark: #8b5cf6;
    --color-primary-light: #c4b5fd;
    --bg-base: #0a0a14;
    --bg-surface: rgba(167, 139, 250, 0.06);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border: rgba(167, 139, 250, 0.12);
    --border-hover: rgba(167, 139, 250, 0.30);
}

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

body {
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* 导航 */
.about-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 12px 20px;
    background: rgba(10, 10, 20, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.about-back {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary-light);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.25s ease;
}

.about-back:hover { color: #fff; }

.about-back i { font-size: 1.1em; }

/* 容器 */
.about-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

/* Hero */
.about-hero {
    text-align: center;
    padding: 48px 0 32px;
}

.about-hero h1 {
    font-family: 'PingFang SC', 'STSong', 'SimSun', 'STKaiti', serif;
    font-size: 2.4em;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    line-height: 1.3;
}

.about-hero-sub {
    color: var(--text-secondary);
    font-size: 1.05em;
}

/* Section */
.about-section {
    margin-bottom: 40px;
}

.about-section-title {
    font-family: 'PingFang SC', 'STSong', 'SimSun', 'STKaiti', serif;
    font-size: 1.35em;
    color: var(--color-primary-light);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

.about-section p {
    color: var(--text-secondary);
    font-size: 0.95em;
    margin-bottom: 12px;
    line-height: 1.8;
}

/* 统计条 */
.about-stat-row {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 24px;
    padding: 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.about-stat {
    text-align: center;
}

.about-stat-num {
    font-family: 'PingFang SC', 'STSong', 'SimSun', 'STKaiti', serif;
    font-size: 1.8em;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.about-stat-label {
    color: var(--text-muted);
    font-size: 0.78em;
    margin-top: 4px;
}

/* 维度卡片 */
.dim-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 14px;
    transition: border-color 0.3s ease;
}

.dim-card:hover {
    border-color: var(--border-hover);
}

.dim-card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}

.dim-letter {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFang SC', 'STSong', 'SimSun', 'STKaiti', serif;
    font-size: 1.5em;
    font-weight: 700;
    flex-shrink: 0;
}

.dim-o { background: rgba(236, 72, 153, 0.15); color: #f472b6; }
.dim-c { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.dim-e { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.dim-a { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.dim-n { background: rgba(139, 92, 246, 0.15); color: #a78bfa; }

.dim-meta h3 {
    font-size: 1em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.dim-sub {
    font-size: 0.78em;
    color: var(--text-muted);
}

/* 维度进度条（示意） */
.dim-bar {
    height: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    margin-bottom: 14px;
    overflow: hidden;
}

.dim-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.6s ease;
}

.dim-o-fill { background: linear-gradient(90deg, #f472b6, #ec4899); }
.dim-c-fill { background: linear-gradient(90deg, #60a5fa, #3b82f6); }
.dim-e-fill { background: linear-gradient(90deg, #fbbf24, #f59e0b); }
.dim-a-fill { background: linear-gradient(90deg, #34d399, #10b981); }
.dim-n-fill { background: linear-gradient(90deg, #a78bfa, #8b5cf6); }

/* 高低分描述 */
.dim-desc {
    display: flex;
    gap: 16px;
}

.dim-pole {
    flex: 1;
    font-size: 0.82em;
    color: var(--text-secondary);
    line-height: 1.6;
}

.dim-pole strong {
    display: block;
    color: var(--color-primary-light);
    margin-bottom: 2px;
    font-size: 0.9em;
}

/* Feature 列表 */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    transition: border-color 0.3s ease;
}

.feature-item:hover {
    border-color: var(--border-hover);
}

.feature-item-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.18), rgba(139, 92, 246, 0.22));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1em;
    color: var(--color-primary-light);
    flex-shrink: 0;
}

.feature-item-body h4 {
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.feature-item-body p {
    font-size: 0.82em;
    color: var(--text-secondary);
    margin: 0;
}

/* 对比表 */
.compare-table {
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
}

.compare-row {
    display: flex;
}

.compare-row + .compare-row {
    border-top: 1px solid var(--border);
}

.compare-header {
    background: rgba(167, 139, 250, 0.10);
}

.compare-header .compare-cell {
    font-weight: 600;
    color: var(--color-primary-light);
    font-size: 0.85em;
}

.compare-cell {
    flex: 1;
    padding: 12px 14px;
    font-size: 0.82em;
    color: var(--text-secondary);
    line-height: 1.5;
}

.compare-cell:first-child {
    flex: 0.7;
    color: var(--text-primary);
    font-weight: 500;
}

/* CTA */
.about-cta {
    text-align: center;
    padding: 24px 0 0;
}

.about-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 44px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 6px 25px rgba(167, 139, 250, 0.50);
    transition: all 0.3s ease;
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.about-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(167, 139, 250, 0.60);
}

.about-cta-btn i {
    font-size: 0.9em;
    transition: transform 0.3s ease;
}

.about-cta-btn:hover i {
    transform: translateX(4px);
}

/* 响应式 */
@media (max-width: 768px) {
    .about-hero h1 { font-size: 1.8em; }
    .about-stat-row { gap: 16px; padding: 16px; }
    .about-stat-num { font-size: 1.4em; }
    .dim-desc { flex-direction: column; gap: 8px; }
    .compare-cell { padding: 10px; font-size: 0.78em; }
}

@media (max-width: 480px) {
    .about-hero h1 { font-size: 1.5em; }
    .about-hero-sub { font-size: 0.9em; }
    .about-stat-row { flex-direction: column; gap: 12px; }
    .about-stat-num { font-size: 1.6em; }
    .dim-card { padding: 16px; }
    .compare-cell { padding: 8px; font-size: 0.75em; }
}