.about-wrapper {
    width: min(960px, 92%);
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.about-hero {
    padding: 3rem 3.5rem;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(18, 26, 46, 0.85), rgba(14, 18, 34, 0.85));
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow:
        0 20px 60px rgba(12, 18, 38, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    text-align: center;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.about-hero h1 {
    font-size: clamp(2.4rem, 4vw, 3.2rem);
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: transparent;
    background: linear-gradient(120deg, var(--primary), var(--accent), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
}

.about-intro {
    font-size: 1.1rem;
    line-height: 1.9;
    color: rgba(232, 236, 241, 0.9);
    max-width: 680px;
    margin: 0 auto 1.75rem;
}

.about-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.about-tag {
    padding: 0.45rem 1.2rem;
    border-radius: 999px;
    font-size: 0.95rem;
    color: var(--text);
    background: rgba(79, 140, 255, 0.12);
    border: 1px solid rgba(79, 140, 255, 0.3);
    box-shadow: 0 0 20px rgba(79, 140, 255, 0.2);
}

.section-card {
    padding: 2.5rem 3rem;
    border-radius: 24px;
    background: rgba(10, 12, 26, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow:
        0 18px 48px rgba(6, 12, 30, 0.45),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text);
    letter-spacing: 0.08em;
}

.section-title span {
    color: var(--primary-glow);
}

.timeline {
    position: relative;
    margin-top: 2rem;
    padding-left: 2.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0.5rem;
    bottom: 0.5rem;
    left: 1.15rem;
    width: 2px;
    background: linear-gradient(180deg, rgba(79, 140, 255, 0.75), rgba(0, 212, 255, 0.2));
}

.timeline-item {
    position: relative;
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.2rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -1.35rem;
    top: 0.6rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 16px rgba(79, 140, 255, 0.6);
}

.timeline-date {
    min-width: 140px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: rgba(232, 236, 241, 0.75);
}

.timeline-content {
    flex: 1;
    background: rgba(18, 28, 52, 0.65);
    border-radius: 18px;
    padding: 1.35rem 1.6rem;
    border: 1px solid rgba(79, 140, 255, 0.2);
    box-shadow: 0 15px 35px rgba(8, 12, 30, 0.4);
}

.timeline-role {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.45rem;
    color: rgba(255, 255, 255, 0.92);
}

.timeline-desc {
    font-size: 0.98rem;
    line-height: 1.75;
    color: rgba(200, 210, 230, 0.9);
}

.about-quote {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.88);
    text-transform: uppercase;
}

.about-quote span {
    color: var(--primary-glow);
}

.closing-card {
    padding: 2rem;
    border-radius: 20px;
    background: rgba(14, 18, 34, 0.78);
    border: 1px solid rgba(79, 140, 255, 0.18);
    box-shadow: 0 18px 45px rgba(10, 15, 35, 0.4);
}

/* 按钮容器 - 一左一右布局 */
.buttons-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    flex-direction: row; /* 强制横向排列 */
}

.buttons-container .button-group {
    margin-bottom: 0;
    flex: 0 0 auto;
    justify-content: flex-start; /* 覆盖 button-group 的 center 对齐 */
}

@media (max-width: 900px) {
    .about-hero,
    .section-card {
        padding: 2.25rem;
    }

    .timeline {
        padding-left: 2rem;
    }

    .timeline-date {
        min-width: 120px;
    }
}

@media (max-width: 640px) {
    .about-hero {
        padding: 2rem 1.75rem;
    }

    .about-intro {
        font-size: 1rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline::before {
        left: 0.9rem;
    }

    .timeline-date {
        min-width: 100px;
        font-size: 0.95rem;
    }

    .timeline-item {
        flex-direction: column;
        padding-left: 1.75rem;
    }

    .timeline-dot {
        left: -0.6rem;
    }

    .timeline-content {
        padding: 1.1rem 1.3rem;
    }

    /* 小屏幕时仍然保持一行，但按钮可以稍微缩小 */
    .buttons-container {
        flex-direction: row; /* 保持横向排列 */
        gap: 1rem;
        max-width: 100%;
    }

    .buttons-container .button-group {
        flex: 1; /* 让两个按钮平分空间 */
    }

    .buttons-container .button-group .btn {
        width: 100%;
        padding: 0.8rem 1.5rem; /* 稍微缩小内边距 */
        font-size: 0.9rem;
    }
}