/* =====================================================
   关于我们 — 深色科技风格
   ===================================================== */

/* ---------- 基础框架 ---------- */

#page-guanyu {
    padding-top: max(112px, calc(env(safe-area-inset-top, 0px) + var(--nav-stack-clearance, 104px)));
    padding-bottom: 120px;
    letter-spacing: 0.02em;
}

/* ---------- 英雄区 ---------- */

.about-hero {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 24px;
    padding-top: 16px;
}

.about-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 900;
    margin: 0 0 16px;
    line-height: 1.15;
    letter-spacing: -0.04em;
    background: linear-gradient(to right, #ffffff, var(--accent, #34d399));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.about-hero-lead {
    font-size: 1.0625rem;
    font-weight: 300;
    color: var(--ink-light);
    line-height: 1.7;
    margin: 0 0 8px;
}

.about-hero-meta {
    font-size: 0.8125rem;
    font-weight: 500;
    color: #627368;
    margin: 0;
}

/* ---------- 快速链接 ---------- */

.about-quick-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 80px;
}

.about-quick-links a {
    display: inline-flex;
    align-items: center;
    padding: 11px 22px;
    font-size: 0.9375rem;
    font-weight: 600;
    color: #ecfdf3;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
    white-space: nowrap;
}

.about-quick-links a:hover {
    background: #ffffff;
    border-color: rgba(255, 255, 255, 0.9);
    color: #0f172a;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ---------- 通用区段间距 ---------- */

.about-section {
    margin-bottom: 100px;
    scroll-margin-top: var(--nav-stack-clearance, 104px);
    position: relative;
}

/* ---------- 垂直装饰文字 ---------- */

.about-vtag {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.45em;
    text-transform: uppercase;
    color: var(--accent, #34d399);
    opacity: 0.5;
    position: absolute;
    left: -2.5rem;
    top: 0;
    white-space: nowrap;
    pointer-events: none;
}

.about-vtag--right {
    left: auto;
    right: -2.5rem;
}

@media (max-width: 900px) {
    .about-vtag {
        display: none;
    }
}

/* ======================================================
   我们是谁 — Identity
   ====================================================== */

.about-section--identity {
    padding-left: 3rem;
}

@media (max-width: 900px) {
    .about-section--identity {
        padding-left: 0;
    }
}

.about-identity-grid {
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: 48px 60px;
    align-items: end;
}

@media (max-width: 768px) {
    .about-identity-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

.about-identity-h {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 300;
    line-height: 1.25;
    letter-spacing: -0.03em;
    color: #ecfdf3;
    margin: 0;
}

.about-identity-h strong {
    font-weight: 900;
    font-style: italic;
}

.about-identity-lead {
    font-size: 1.125rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--ink-light);
    margin: 0 0 28px;
}

.about-hl {
    color: #ecfdf3;
    border-bottom: 1px solid rgba(52, 211, 153, 0.3);
    padding-bottom: 1px;
}

.about-identity-footnotes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 24px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

@media (max-width: 560px) {
    .about-identity-footnotes {
        grid-template-columns: 1fr;
    }
}

.about-identity-footnotes p {
    margin: 0;
    font-size: 0.8125rem;
    font-weight: 400;
    line-height: 1.65;
    color: #627368;
}

.about-identity-footnotes strong {
    color: var(--ink-light);
}

/* ======================================================
   我们提供什么 — Services
   ====================================================== */

.about-section--services {
    padding-left: 3rem;
}

@media (max-width: 900px) {
    .about-section--services {
        padding-left: 0;
    }
}

.about-services-head {
    position: relative;
    margin-bottom: 40px;
}

/* 大背景幽灵字 */
.about-ghost-h {
    position: absolute;
    top: -0.55em;
    left: -0.04em;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    color: #ecfdf3;
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
    white-space: nowrap;
}

.about-services-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    color: #ecfdf3;
    margin: 0;
    position: relative;
    z-index: 1;
}

.about-services-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 16px;
    align-items: stretch;
}

@media (max-width: 768px) {
    .about-services-grid {
        grid-template-columns: 1fr;
    }
}

/* 科技感边框卡片 */
.about-cyber-card {
    position: relative;
    background: rgba(10, 18, 12, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 36px 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s;
    overflow: hidden;
}

.about-cyber-card::before {
    content: "";
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, var(--accent, #34d399), transparent 40%, transparent 60%, var(--accent, #34d399));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s;
}

.about-cyber-card:hover {
    transform: scale(1.01);
    border-color: transparent;
}

.about-cyber-card:hover::before {
    opacity: 0.25;
}

.about-cyber-card--wide {
    min-height: 0;
    height: 100%;
    justify-content: space-between;
    box-sizing: border-box;
}

.about-service-num {
    font-size: 0.7rem;
    font-weight: 700;
    font-family: monospace;
    letter-spacing: 0.1em;
    color: var(--accent, #34d399);
    opacity: 0.8;
}

.about-cyber-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ecfdf3;
    margin: 0;
    letter-spacing: -0.02em;
}

.about-cyber-card p {
    font-size: 0.9375rem;
    font-weight: 400;
    line-height: 1.65;
    color: #627368;
    margin: 0;
}

.about-cyber-card a {
    color: var(--ink-light);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s;
}

.about-cyber-card a:hover {
    color: var(--accent, #34d399);
}

.about-cyber-cta {
    display: inline-block;
    padding: 12px 24px;
    background: #ecfdf3;
    color: #050a07 !important;
    font-size: 0.875rem;
    font-weight: 700;
    text-decoration: none !important;
    letter-spacing: 0.04em;
    transition: background 0.3s, color 0.3s;
    align-self: flex-start;
}

.about-cyber-cta:hover {
    background: var(--accent, #34d399) !important;
    color: #050a07 !important;
}

.about-services-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
}

.about-services-stack .about-cyber-card {
    flex: 1;
}

.about-services-stack .about-cyber-card h3 {
    font-size: 1.125rem;
}

.about-services-stack .about-cyber-card {
    padding: 28px 24px;
}

/* ======================================================
   我们坚持的事 — Values
   ====================================================== */

.about-section--values {
    padding-right: 3rem;
}

@media (max-width: 900px) {
    .about-section--values {
        padding-right: 0;
    }
}

.about-values-head {
    position: relative;
    margin-bottom: 48px;
    text-align: right;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

@media (max-width: 768px) {
    .about-values {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.about-value-item {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.about-value-line {
    height: 1px;
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    margin-bottom: 28px;
    transition: background 0.45s;
}

.about-value-item:hover .about-value-line {
    background: var(--accent, #34d399);
}

.about-value-item h3 {
    font-size: 1.1875rem;
    font-weight: 700;
    color: #ecfdf3;
    margin: 0 0 14px;
    letter-spacing: -0.01em;
}

.about-value-item p {
    font-size: 0.875rem;
    line-height: 1.7;
    color: #627368;
    margin: 0 0 20px;
    flex: 1;
}

.about-value-item a {
    color: var(--ink-light);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s;
}

.about-value-item a:hover {
    color: var(--accent, #34d399);
}

.about-value-tag {
    font-size: 0.65rem;
    font-weight: 700;
    font-family: monospace;
    letter-spacing: 0.12em;
    color: var(--accent, #34d399);
    opacity: 0;
    transition: opacity 0.35s;
    pointer-events: none;
}

.about-value-item:hover .about-value-tag {
    opacity: 1;
}