/* 关于页 — Ledger Warm：大编号章节堆叠 + 横向里程碑 + 联系卡片横排 */

body.page-ledger {
    --canvas: #f4f0e8;
    --canvas-deep: #ebe5da;
    --surface-card: #faf8f4;
    --surface-card-elevated: #ffffff;
    --surface-strong: #e8e2d6;
    --primary: #b45309;
    --primary-active: #92400e;
    --ink: #1a2744;
    --body: #4a5568;
    --muted: #718096;
    --on-primary: #ffffff;
    --hairline: #ddd6c8;
    --hairline-strong: #c9bfae;
    --accent-light: rgba(180, 83, 9, 0.1);
    --font-display: "Fraunces", "Noto Sans SC", Georgia, serif;
    --font-body: "Source Sans 3", "Noto Sans SC", sans-serif;
    --nav-height: 72px;
    --radius-sm: 6px;
    --radius-md: 10px;

    font-family: var(--font-body);
    background: var(--canvas);
    color: var(--body);
}

body.page-ledger .main-nav {
    background: var(--canvas);
    border-bottom: none;
    height: auto;
    display: flex;
    flex-direction: column;
}

body.page-ledger .nav-container--ledger {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: var(--nav-height);
    gap: var(--space-md);
}

body.page-ledger .nav-links--center {
    justify-self: center;
}

body.page-ledger .nav-right {
    justify-self: end;
    gap: 10px;
}

body.page-ledger .logo-brand {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--ink);
    font-size: 17px;
}

body.page-ledger .nav-links a {
    color: var(--body);
    font-weight: 500;
    background: transparent;
}

body.page-ledger .nav-links a:hover {
    color: var(--ink);
    background: rgba(26, 39, 68, 0.05);
}

body.page-ledger .nav-links a.active {
    color: var(--primary);
    background: var(--accent-light);
}

body.page-ledger .nav-cta {
    height: 36px;
    padding: 0 16px;
    font-size: 14px;
}

body.page-ledger .nav-rule-line {
    display: block;
    height: 1px;
    background: var(--hairline);
}

body.page-ledger .nav-rule-line--accent {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary) 20%, var(--primary) 80%, transparent);
    opacity: 0.35;
}

body.page-ledger .dropdown-trigger {
    border-color: var(--hairline-strong);
    color: var(--body);
    background: var(--surface-card-elevated);
}

body.page-ledger .dropdown-trigger:hover {
    background: var(--surface-card);
    color: var(--ink);
}

body.page-ledger .dropdown-content {
    background: var(--surface-card-elevated);
    border-color: var(--hairline-strong);
    box-shadow: 0 4px 12px rgba(26, 39, 68, 0.06);
}

body.page-ledger .dropdown-content a {
    color: var(--body);
    border-color: var(--hairline);
}

body.page-ledger .dropdown-content a:hover {
    background: var(--surface-card);
    color: var(--ink);
}

body.page-ledger .dropdown-content a.active {
    background: var(--accent-light);
    color: var(--primary);
}

body.page-ledger .btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--on-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

body.page-ledger .btn-primary:hover {
    background: var(--primary-active);
    border-color: var(--primary-active);
}

body.page-ledger .btn-secondary {
    background: var(--surface-card-elevated);
    border-color: var(--hairline-strong);
    color: var(--ink);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

body.page-ledger .btn-secondary:hover {
    background: var(--surface-card);
    border-color: var(--hairline-strong);
}

body.page-ledger footer {
    background: var(--canvas-deep);
    border-top-color: var(--hairline-strong);
    color: var(--body);
}

body.page-ledger .footer-logo-text,
body.page-ledger .footer-contact-item strong {
    font-family: var(--font-display);
    color: var(--ink);
}

body.page-ledger .footer-group-title {
    font-family: var(--font-body);
    color: var(--primary);
    letter-spacing: 0.06em;
}

body.page-ledger .footer-description,
body.page-ledger .footer-links-list li a,
body.page-ledger .footer-contact-item,
body.page-ledger .footer-copyright {
    color: var(--body);
}

body.page-ledger .footer-links-list li a:hover {
    color: var(--primary);
}

body.page-ledger .footer-bottom {
    border-top-color: var(--hairline-strong);
}

body.page-ledger .footer-social-link {
    background: var(--surface-card-elevated);
    border: 1px solid var(--hairline-strong);
    color: var(--body);
}

body.page-ledger .footer-social-link:hover {
    background: var(--surface-card);
    color: var(--primary);
    border-color: var(--primary);
}
main {
    padding-top: var(--nav-height);
    background: var(--canvas);
}

.about-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ----- page-header ----- */
.page-header--about {
    padding: 56px 0 48px;
    background: var(--canvas-deep);
    border-bottom: 1px solid var(--hairline);
}

.about-hero-main {
    max-width: 680px;
}

.page-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 20px;
}

.page-breadcrumb a {
    color: var(--body);
    text-decoration: none;
}

.page-breadcrumb a:hover {
    color: var(--primary);
}

.page-breadcrumb i {
    font-size: 9px;
}

.about-kicker {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(34px, 4.5vw, 48px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin-bottom: 16px;
}

.title-accent {
    font-style: italic;
    color: var(--primary);
}

.page-subtitle {
    font-size: 18px;
    line-height: 1.65;
    color: var(--body);
    margin: 0;
}

/* ----- content-document：大编号章节堆叠 ----- */
.content-document {
    padding: 0;
}

.stacked-section {
    padding: 64px 0;
    border-bottom: 1px solid var(--hairline);
}

.stacked-section:last-child {
    border-bottom: none;
}

.stacked-section-inner {
    display: grid;
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
}

.section-num {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    line-height: 1;
    color: var(--primary);
    opacity: 0.35;
}

.doc-heading {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 20px;
}

.lead-text {
    font-family: var(--font-display);
    font-size: 22px;
    line-height: 1.45;
    font-weight: 500;
    color: var(--ink);
    margin-bottom: 20px;
}

.section-body p {
    font-size: 16px;
    line-height: 1.75;
    color: var(--body);
    margin-bottom: 16px;
}

.section-body p:last-child {
    margin-bottom: 0;
}

.metrics-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: 28px;
}

.metric-item {
    background: #fff;
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    padding: 18px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-value {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
}

.metric-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
}

/* 行事原则 */
.values-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.value-card {
    background: #fff;
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    padding: 22px;
    transition: border-color var(--transition-normal);
}

.value-card:hover {
    border-color: rgba(180, 83, 9, 0.3);
}

.value-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: var(--radius-sm);
    color: var(--primary);
    font-size: 14px;
    margin-bottom: 14px;
}

.value-card h3 {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}

.value-card p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--body);
    margin: 0;
}

/* 横向里程碑 */
.milestone-track {
    position: relative;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
}

.milestone-track::before {
    content: "";
    position: absolute;
    top: 28px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--hairline));
}

.milestone-row {
    display: flex;
    gap: 20px;
    min-width: min-content;
    padding-top: 8px;
}

.milestone-card {
    flex: 0 0 200px;
    position: relative;
    padding-top: 36px;
}

.milestone-card::before {
    content: "";
    position: absolute;
    top: 20px;
    left: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--canvas);
    border: 2px solid var(--primary);
}

.milestone-card--current::before {
    background: var(--primary);
    box-shadow: 0 0 0 4px var(--accent-light);
}

.milestone-year {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.milestone-card h3 {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 6px;
}

.milestone-card p {
    font-size: 13px;
    line-height: 1.55;
    color: var(--body);
    margin: 0;
}

/* 联系卡片横排 */
.contact-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.contact-card:last-child .contact-value {
    font-size: 13px;
}

.contact-card {
    background: #fff;
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.contact-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--ink);
    line-height: 1.5;
}

/* ----- doc-cta ----- */
.doc-cta {
    background: var(--canvas-deep);
    border-top: 1px solid var(--hairline);
}

.doc-cta-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 56px var(--space-md);
    text-align: center;
}

.doc-cta h3 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 10px;
}

.doc-cta p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--body);
    margin-bottom: 24px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

@media (max-width: 900px) {
    .stacked-section-inner {
        grid-template-columns: 56px minmax(0, 1fr);
        gap: 20px;
    }

    .section-num {
        font-size: 36px;
    }

    .metrics-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .contact-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

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

    .section-num {
        font-size: 32px;
        opacity: 0.5;
    }

    .values-row,
    .metrics-row,
    .contact-row {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        max-width: 280px;
        margin: 0 auto;
    }
}