/* about.css — 关于页特有样式 */

/* ---------- 双栏布局 ---------- */
.about-layout {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 48px;
    align-items: start;
}

.about-main { min-width: 0; }

.about-aside {
    position: sticky;
    top: 88px;
}

@media (max-width: 992px) {
    .about-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .about-aside {
        position: sticky;
        top: 64px;
        z-index: 10;
        background: var(--white-shallow);
        margin: -16px 0 8px;
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-shallow);
    }
    .about-aside .aside-title {
        display: none;
    }
    .about-aside .anchor-box {
        display: flex;
        gap: 16px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 0 4px;
    }
    .about-aside .anchor-box .link {
        white-space: nowrap;
        padding: 6px 14px;
        border-radius: var(--border-radius-full);
        background: var(--white);
        border: 1px solid var(--gray-shallow);
        font-size: var(--font-size-sm);
        flex-shrink: 0;
    }
    .about-aside .anchor-box .link.active {
        background: var(--default);
        color: var(--white-common);
        border-color: var(--default);
    }
    .about-aside .anchor-box .slider {
        display: none;
    }
}

@media (max-width: 640px) {
    .about-aside {
        margin: -8px -16px 8px;
        padding: 10px 16px;
    }
    .about-aside .anchor-box {
        gap: 10px;
    }
}

/* ---------- 侧边锚点导航 ---------- */
.about-aside .aside-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--black-shallow);
    text-transform: uppercase;
    letter-spacing: .08em;
    margin: 0 0 14px;
    padding-left: 8px;
}

.about-aside .anchor-box {
    padding-top: 4px;
}

/* ---------- 段落标题 ---------- */
.about-section {
    margin-top: clamp(40px, 6vw, 64px);
    scroll-margin-top: 80px;
}

.about-section:first-child {
    margin-top: 0;
}

.about-section-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
}

.about-section-head .bny-icon {
    font-size: 22px;
    color: var(--default);
}

.about-section-head h2 {
    font-size: clamp(1.4rem, 2.5vw, 1.85rem);
    font-weight: var(--font-weight-semibold);
    color: var(--black);
    margin: 0;
    line-height: 1.3;
}

/* ---------- 项目定位卡 ---------- */
.intro-card {
    padding: 36px 40px;
}

.intro-card .intro-body {
    width: 100%;
}

.intro-card .intro-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--border-radius);
    background: var(--default-alpha-10);
    color: var(--default);
    font-size: 28px;
    margin-bottom: 18px;
}

.intro-card .intro-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: var(--font-weight-semibold);
    color: var(--black);
    margin: 0 0 8px;
    line-height: 1.2;
}

.intro-card .intro-role {
    font-size: var(--font-size);
    color: var(--default);
    font-weight: var(--font-weight-medium);
    margin: 0 0 16px;
}

.intro-card .intro-desc {
    font-size: var(--font-size-16);
    color: var(--black-shallow);
    line-height: 1.8;
    margin: 0 0 20px;
}

.intro-card .intro-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: var(--font-size-sm);
    color: var(--black-shallow);
}

.intro-card .intro-meta .meta-line {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.intro-card .intro-meta .bny-icon {
    color: var(--default);
    font-size: 15px;
}

@media (max-width: 640px) {
    .intro-card {
        padding: 28px 24px;
    }
    .intro-card .intro-meta {
        gap: 12px 20px;
    }
}

/* ---------- 折叠面板（设计原则） ---------- */
.about-collapse .item .title {
    padding-left: 48px;
}

.about-collapse .item .content {
    color: var(--black-shallow);
    line-height: 1.8;
}

.about-collapse .item .content p {
    margin: 0 0 10px;
}

.about-collapse .item .content p:last-child {
    margin-bottom: 0;
}

/* ---------- 时间线（项目路线图） ---------- */
.about-timeline {
    padding-left: 4px;
}

.about-timeline .bny-timeline-item {
    padding-bottom: 28px;
}

.about-timeline .bny-timeline-title {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.about-timeline .bny-timeline-title .bny-tag {
    margin-left: 0;
}

/* ---------- 性能亮点卡片 ---------- */
.perf-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.perf-card {
    text-align: center;
    height: 100%;
}

.perf-card .body {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.perf-card .perf-icon {
    font-size: 32px;
    color: var(--default);
    margin-bottom: 12px;
}

.perf-card .perf-title {
    font-size: var(--font-size);
    font-weight: var(--font-weight-semibold);
    color: var(--black);
    margin: 0 0 8px;
}

.perf-card .perf-desc {
    font-size: var(--font-size-sm);
    color: var(--black-shallow);
    line-height: 1.6;
    margin: 0;
}

@media (max-width: 992px) {
    .perf-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .perf-grid { grid-template-columns: 1fr; }
}

/* ---------- 双栏信息卡（三编译器四平台） ---------- */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.platform-card {
    height: 100%;
}

.platform-card .body {
    padding: 28px 28px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.platform-card .platform-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.platform-card .platform-head .bny-icon {
    font-size: 24px;
    color: var(--default);
}

.platform-card .platform-head h3 {
    font-size: var(--font-size-20);
    font-weight: var(--font-weight-semibold);
    color: var(--black);
    margin: 0;
}

.platform-card .platform-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
}

.platform-card .platform-tags .bny-tag {
    margin-left: 0;
}

.platform-card .platform-desc {
    font-size: var(--font-size-sm);
    color: var(--black-shallow);
    line-height: 1.7;
    margin: 0;
}

@media (max-width: 992px) {
    .platform-grid { grid-template-columns: 1fr; }
}

/* ---------- 贡献链接矩阵 ---------- */
.links-matrix {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.link-card {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.link-card .body {
    padding: 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.link-card .link-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.link-card .link-head .bny-icon {
    font-size: 24px;
    color: var(--default);
}

.link-card .link-title {
    font-size: var(--font-size-20);
    font-weight: var(--font-weight-semibold);
    color: var(--black);
}

.link-card .link-desc {
    font-size: var(--font-size-sm);
    color: var(--black-shallow);
    line-height: 1.7;
    margin: 0 0 16px;
    flex: 1;
}

.link-card .bny-btn {
    align-self: flex-start;
}

@media (max-width: 640px) {
    .links-matrix { grid-template-columns: 1fr; }
}

/* ---------- 标签云 ---------- */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag-cloud .bny-tag {
    margin-left: 0;
    font-size: var(--font-size);
    padding: 6px 14px;
    height: auto;
}