/* ============================================
   关于页 — 对齐首页暖色编辑风
   ============================================ */

.about-page {
    --about-max: 920px;

    max-width: var(--about-max);
    margin: 0 auto;
    padding: clamp(0.85rem, 2vw, 1.35rem);
    position: relative;
}

.about-page::before {
    content: "";
    position: absolute;
    inset: -1rem 0 auto;
    height: min(360px, 42vh);
    background:
        radial-gradient(ellipse 70% 55% at 10% 0%, var(--brand-accent-soft), transparent 58%),
        radial-gradient(ellipse 45% 35% at 92% 6%, rgba(184, 92, 56, 0.05), transparent 52%);
    z-index: -1;
    pointer-events: none;
}

.about-workspace {
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
}

/* —— 顶区简介（对齐 home-brief）—— */

.about-brief {
    border-bottom: 1px solid var(--border-color);
    background:
        linear-gradient(180deg, var(--bg-elevated) 0%, rgba(243, 237, 228, 0.55) 100%);
}

.about-brief-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: clamp(0.9rem, 2vw, 1.15rem);
}

.about-brief-id {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.85rem;
    align-items: center;
}

.about-brief-avatar {
    margin: 0;
    width: 72px;
    height: 72px;
    padding: 3px;
    border: 1px solid var(--brand-accent-soft);
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    box-shadow: 0 8px 20px var(--brand-accent-glow);
}

.about-brief-avatar img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: calc(var(--radius-md) - 3px);
}

.about-brief-kicker {
    margin: 0 0 0.25rem;
    color: var(--brand-accent);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.about-brief-title {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(1.65rem, 3.6vw, 2.1rem);
    font-weight: 600;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    text-wrap: balance;
}

.about-brief-role {
    margin: 0.35rem 0 0;
    color: var(--text-muted);
    font-size: 0.84rem;
    line-height: 1.5;
}

.about-brief-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    margin-top: 0.65rem;
}

.about-brief-lede {
    margin: 0;
    font-size: 0.88rem;
    line-height: 1.65;
    color: var(--text-secondary);
    text-wrap: pretty;
}

.about-brief-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    min-height: 2rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.86rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.about-brief-btn:hover {
    border-color: var(--brand-accent);
    color: var(--brand-accent);
    transform: translateY(-1px);
}

.about-brief-btn:active {
    transform: scale(0.98);
}

.about-brief-btn-primary {
    background: var(--brand-accent);
    border-color: var(--brand-accent);
    color: #fff;
    box-shadow: 0 8px 22px var(--brand-accent-glow);
}

.about-brief-btn-primary:hover {
    background: var(--brand-accent-hover);
    border-color: var(--brand-accent-hover);
    color: #fff;
}

.about-brief-btn:focus-visible,
.about-inline-link:focus-visible {
    outline: 2px solid var(--brand-accent);
    outline-offset: 2px;
}

[data-theme="dark"] .about-brief {
    background: linear-gradient(180deg, var(--bg-elevated) 0%, rgba(26, 23, 20, 0.92) 100%);
}

/* —— 内容分区 —— */

.about-section {
    padding: clamp(0.9rem, 2vw, 1.15rem);
    border-bottom: 1px solid var(--border-color);
}

.about-section:last-of-type {
    border-bottom: none;
}

.about-section-head {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.85rem;
}

.about-section-kicker {
    margin: 0;
    color: var(--brand-accent);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.about-section-title {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(1.15rem, 2.4vw, 1.35rem);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.about-section-copy {
    margin: 0;
    max-width: var(--content-readable);
    color: var(--text-muted);
    font-size: 0.86rem;
    line-height: 1.65;
}

.about-section-foot {
    margin: 0.85rem 0 0;
}

.about-inline-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--brand-accent);
    font-size: 0.86rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.about-inline-link:hover {
    gap: 0.5rem;
}

/* —— 服务卡片 —— */

.about-task-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.65rem;
}

.about-task-card {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    padding: 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    transition: var(--transition);
}

.about-task-card:hover {
    border-color: var(--brand-accent);
}

.about-task-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.15rem;
    height: 2.15rem;
    border-radius: var(--radius-sm);
    background: var(--brand-accent-soft);
    color: var(--brand-accent);
}

.about-task-card h3 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
}

.about-task-card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.6;
}

/* —— 研究方向列表 —— */

.about-research-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-secondary);
}

.about-research-item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.75rem;
    align-items: start;
    padding: 0.8rem 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.about-research-item:last-child {
    border-bottom: none;
}

.about-research-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-sm);
    background: var(--brand-accent-soft);
    color: var(--brand-accent);
}

.about-research-item h3 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 0.92rem;
    font-weight: 600;
}

.about-research-item p {
    margin: 0.2rem 0 0;
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.6;
}

/* —— FAQ —— */

.about-faq-list {
    display: flex;
    flex-direction: column;
}

.about-faq-item {
    border-bottom: 1px solid var(--border-color);
}

.about-faq-item:first-child {
    border-top: 1px solid var(--border-color);
}

.about-faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 0.75rem 0;
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.about-faq-item summary::-webkit-details-marker {
    display: none;
}

.about-faq-item summary::after {
    content: "+";
    float: right;
    color: var(--brand-accent);
    font-weight: 700;
    font-size: 1rem;
    line-height: 1.2;
}

.about-faq-item[open] summary::after {
    content: "−";
}

.about-faq-item summary:hover {
    color: var(--brand-accent);
}

.about-faq-answer {
    padding: 0 0 0.85rem;
    color: var(--text-secondary);
    font-size: 0.86rem;
    line-height: 1.65;
}

.about-faq-answer a {
    color: var(--brand-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* —— 页脚 —— */

.about-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.85rem clamp(0.9rem, 2vw, 1.15rem) 1rem;
    color: var(--text-muted);
    font-size: 0.82rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.about-footer a {
    color: var(--brand-accent);
    text-decoration: none;
    font-weight: 500;
}

.about-footer a:hover {
    text-decoration: underline;
}

/* —— 响应式 —— */

@media (max-width: 820px) {
    .about-task-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .about-footer {
        flex-direction: column;
    }
}