:root {
    --accent: #f56600;
    --accent-strong: #d95400;
    --ink: #20242b;
    --muted: #657080;
    --line: rgba(32, 36, 43, 0.12);
    --soft: #fff5eb;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-width: 320px;
    color: var(--ink);
    background: #fff;
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    letter-spacing: 0;
}

a { color: inherit; text-decoration: none; }

.about-header {
    position: sticky;
    z-index: 20;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    padding: 0 30px;
    border-top: 3px solid var(--accent);
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
}

.about-brand,
.about-header-actions,
.about-brand-copy {
    display: flex;
    align-items: center;
}

.about-brand { gap: 10px; width: max-content; }
.about-brand-mark { display: grid; width: 36px; height: 36px; place-items: center; }
.about-brand-icon { display: block; width: 36px; height: 36px; }
.about-brand-icon-bg { fill: #f56600; }
.about-brand-icon-mark { fill: #fff; }
.about-brand-copy { align-items: flex-start; flex-direction: column; line-height: 1.05; }
.about-brand strong { font-size: 16px; }
.about-brand small { margin-top: 5px; color: #7c8490; font-size: 9px; }
.about-header-actions { gap: 10px; }

.icon-link,
.login-link {
    display: inline-grid;
    height: 40px;
    place-items: center;
    border-radius: 7px;
}

.icon-link {
    width: 40px;
    border: 1px solid rgba(32, 36, 43, 0.12);
    color: #646c78;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 5px 16px rgba(32, 36, 43, 0.06);
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.icon-link:hover {
    color: var(--accent);
    border-color: rgba(245, 102, 0, 0.4);
    background: #fff7ef;
    transform: translateY(-1px);
}

.login-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 96px;
    height: 42px;
    padding: 0 22px;
    border: 1px solid rgba(255, 255, 255, 0.42);
    border-radius: 8px;
    color: #fff;
    background: linear-gradient(135deg, #ff861f 0%, #f56600 48%, #df5000 100%);
    box-shadow: 0 10px 24px rgba(223, 80, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    font-size: 14px;
    font-weight: 700;
    transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.login-link:hover {
    background: linear-gradient(135deg, #ff922f 0%, #ef6000 52%, #cf4700 100%);
    box-shadow: 0 13px 30px rgba(223, 80, 0, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.35);
    transform: translateY(-1px);
}

.login-link:active { transform: translateY(0); }
.login-link i { font-size: 15px; }

.about-hero {
    position: relative;
    overflow: hidden;
    min-height: 520px;
    border-bottom: 1px solid rgba(245, 102, 0, 0.2);
    background: linear-gradient(112deg, #fffdfb 0%, #fff1e2 55%, #ffc58b 100%);
}

.about-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(480px, 1.08fr);
    align-items: center;
    gap: 56px;
    width: min(calc(100% - 64px), 1380px);
    min-height: 520px;
    margin: 0 auto;
}

.about-hero-copy { position: relative; z-index: 2; }
.section-kicker { color: var(--accent); font-size: 11px; font-weight: 800; }

.about-hero h1 {
    margin: 18px 0 22px;
    color: #442411;
    font-size: 48px;
    font-weight: 800;
    line-height: 1.28;
}

.about-hero p {
    max-width: 610px;
    margin: 0;
    color: #63594f;
    font-size: 16px;
    line-height: 2;
}

.value-line {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 28px;
    color: #a94100;
    font-size: 13px;
    font-weight: 800;
}

.value-line i { color: var(--accent); font-size: 7px; }

.about-city {
    display: block;
    width: 100%;
    max-height: 460px;
    object-fit: contain;
    object-position: center;
    mix-blend-mode: multiply;
    -webkit-mask-image: radial-gradient(115% 100% at 52% 42%, #000 50%, rgba(0, 0, 0, 0.55) 72%, transparent 96%);
    mask-image: radial-gradient(115% 100% at 52% 42%, #000 50%, rgba(0, 0, 0, 0.55) 72%, transparent 96%);
}

.section-inner { width: min(calc(100% - 64px), 1380px); margin: 0 auto; }

.intro-band { padding: 72px 0; background: #fff; }

.intro-layout {
    display: grid;
    grid-template-columns: 0.72fr 1.28fr;
    gap: 90px;
}

.section-heading h2 {
    margin: 10px 0 0;
    color: #2a2928;
    font-size: 32px;
    line-height: 1.35;
}

.intro-copy p,
.section-heading-row > p {
    color: var(--muted);
    font-size: 15px;
    line-height: 2;
}

.intro-copy p { margin: 0 0 18px; }
.intro-copy p:last-child { margin-bottom: 0; }

.overview-section {
    padding: 76px 0 82px;
    background: #f4f6f8;
}

.section-heading-row {
    display: grid;
    grid-template-columns: 0.72fr 1.28fr;
    align-items: end;
    gap: 90px;
    margin-bottom: 38px;
}

.section-heading-row > p { margin: 0; }

.metric-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: #fff;
}

.metric-row div {
    min-height: 130px;
    padding: 30px;
    border-right: 1px solid var(--line);
}

.metric-row div:last-child { border-right: 0; }
.metric-row strong { display: block; color: var(--accent); font-size: 30px; }
.metric-row span { display: block; margin-top: 10px; color: var(--muted); font-size: 13px; }

.business-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    margin-top: 28px;
    background: var(--line);
}

.business-block {
    position: relative;
    min-height: 430px;
    padding: 42px 42px 38px;
    background: #fff;
}

.business-index { color: rgba(245, 102, 0, 0.28); font-size: 42px; font-weight: 800; }
.business-block h3 { margin: 8px 0 26px; font-size: 22px; }
.business-block ul { margin: 0; padding-left: 20px; }
.business-block li { margin-bottom: 14px; color: #5d6673; font-size: 14px; line-height: 1.8; }

.proof-section { padding: 76px 0 86px; background: #fff; }
.proof-section-light { background: #fff8f1; }

.proof-figure {
    overflow: hidden;
    margin: 0;
    border: 1px solid rgba(245, 102, 0, 0.16);
    background: #fff;
}

.proof-figure img { display: block; width: 100%; height: auto; }
.proof-figure-tall { max-width: 1120px; margin-right: auto; margin-left: auto; }

.partner-section {
    padding: 76px 0 92px;
    border-top: 1px solid rgba(245, 102, 0, 0.18);
    background: #fff5eb;
}

.partner-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 10px;
}

.partner-item {
    display: grid;
    min-height: 116px;
    padding: 18px;
    place-items: center;
    border: 1px solid rgba(55, 63, 74, 0.1);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.9);
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.partner-item:hover {
    border-color: rgba(245, 102, 0, 0.42);
    box-shadow: 0 12px 30px rgba(108, 51, 11, 0.1);
    transform: translateY(-2px);
}

.partner-item img { display: block; width: 100%; max-width: 180px; max-height: 72px; object-fit: contain; }

.about-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 82px;
    padding: 18px 32px;
    border-top: 1px solid rgba(41, 50, 68, 0.08);
    color: #7b4b2b;
    background: linear-gradient(180deg, #fffaf5, #fff0e1);
    font-size: 12px;
}

.about-footer-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 14px;
}

.about-footer-sep {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.45;
}

.about-footer a { display: inline-flex; align-items: center; gap: 5px; }
.about-footer .police-badge { display: block; width: 17px; height: auto; filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.18)); }
.about-footer a:hover { color: var(--accent); }

@media (max-width: 1000px) {
    .about-hero-inner { grid-template-columns: 1fr 1fr; gap: 30px; }
    .about-hero h1 { font-size: 38px; }
    .intro-layout,
    .section-heading-row { gap: 44px; }
    .partner-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
    .about-header { min-height: 68px; padding: 8px 12px; }
    .about-brand small { display: none; }
    .login-link { min-width: 70px; padding: 0 15px; }
    .about-hero { min-height: 0; }
    .about-hero-inner {
        display: flex;
        width: calc(100% - 32px);
        min-height: 0;
        padding: 48px 0 42px;
        flex-direction: column;
        align-items: stretch;
    }
    .about-hero h1 { margin-top: 14px; font-size: 34px; }
    .about-hero p { font-size: 14px; }
    .about-city { max-height: 250px; }
    .section-inner { width: calc(100% - 32px); }
    .intro-band,
    .overview-section,
    .proof-section,
    .partner-section { padding: 52px 0; }
    .intro-layout,
    .section-heading-row,
    .business-grid { display: block; }
    .section-heading,
    .section-heading-row > div { margin-bottom: 24px; }
    .section-heading h2 { font-size: 27px; }
    .metric-row { grid-template-columns: 1fr 1fr; }
    .metric-row div { min-height: 112px; padding: 22px; }
    .metric-row div:nth-child(2) { border-right: 0; }
    .metric-row div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
    .metric-row strong { font-size: 25px; }
    .business-block { min-height: 0; padding: 32px 24px; border-bottom: 1px solid var(--line); }
    .business-block:last-child { border-bottom: 0; }
    .partner-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
    .partner-item { min-height: 96px; padding: 12px; }
    .about-footer { padding: 16px 12px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition-duration: 0.01ms !important; }
}