:root {
    --of-primary: #2563eb;
    --of-primary-dark: #1d4ed8;
    --of-accent: #0ea5e9;
    --of-text: #0f172a;
    --of-muted: #64748b;
    --of-border: #e2e8f0;
    --of-bg: #f8fafc;
    --of-card: #ffffff;
    --of-success: #059669;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--of-text);
    background: var(--of-bg);
    line-height: 1.6;
}

a { color: var(--of-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 24px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--of-border);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
}
.site-nav__brand {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--of-text);
}
.site-nav__brand:hover { text-decoration: none; color: var(--of-primary); }
.site-nav__links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 22px;
    font-size: 1rem;
}
.site-nav__links a {
    color: var(--of-muted);
    padding: 6px 0;
    font-size: 1rem;
    font-weight: 500;
}
.site-nav__links a strong {
    color: var(--of-text);
    font-weight: 700;
}
.site-nav__links a:hover { color: var(--of-primary); text-decoration: none; }
.site-nav__cta {
    padding: 10px 18px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--of-primary), var(--of-primary-dark));
    color: #fff !important;
    font-weight: 600;
    font-size: 0.9375rem;
}
.site-nav__cta:hover { text-decoration: none; filter: brightness(1.05); }

.hero {
    padding: 48px 24px 56px;
    text-align: center;
    background: linear-gradient(165deg, #0f172a 0%, #1e3a5f 50%, #0c4a6e 100%);
    color: #f8fafc;
}
.hero h1 {
    margin: 0 0 12px;
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    font-weight: 700;
    letter-spacing: 0.02em;
}
.hero p {
    margin: 0 auto;
    max-width: 42em;
    font-size: 1rem;
    color: rgba(248, 250, 252, 0.78);
}
.hero__badge {
    display: inline-block;
    margin-bottom: 16px;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(56, 189, 248, 0.2);
    color: #7dd3fc;
    border: 1px solid rgba(56, 189, 248, 0.35);
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.section { padding: 48px 0; }
.section--alt { background: #fff; border-top: 1px solid var(--of-border); }
.section h2 {
    margin: 0 0 8px;
    font-size: 1.5rem;
    text-align: center;
}
.section .lead {
    margin: 0 0 36px;
    text-align: center;
    color: var(--of-muted);
    font-size: 0.9375rem;
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}
.card {
    display: block;
    padding: 24px;
    background: var(--of-card);
    border: 1px solid var(--of-border);
    border-radius: 14px;
    transition: box-shadow 0.2s, transform 0.2s;
    color: inherit;
    text-decoration: none !important;
}
.card:hover {
    box-shadow: 0 12px 40px -12px rgba(15, 23, 42, 0.15);
    transform: translateY(-2px);
}
.card__icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 14px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
}
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; font-size: 0.875rem; color: var(--of-muted); }
.card__tag {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--of-primary);
}

.page-hero {
    padding: 40px 24px 32px;
    background: linear-gradient(180deg, #eff6ff 0%, var(--of-bg) 100%);
    border-bottom: 1px solid var(--of-border);
}
.page-hero h1 { margin: 0 0 12px; font-size: clamp(1.5rem, 3vw, 2rem); }
.page-hero .sub { margin: 0; max-width: 40em; color: var(--of-muted); font-size: 0.9375rem; }

.features {
    display: grid;
    gap: 20px;
    margin: 32px 0;
}
@media (min-width: 720px) {
    .features { grid-template-columns: repeat(2, 1fr); }
}
.feature {
    padding: 20px 22px;
    background: #fff;
    border: 1px solid var(--of-border);
    border-radius: 12px;
}
.feature h3 { margin: 0 0 8px; font-size: 1rem; color: var(--of-primary); }
.feature p { margin: 0; font-size: 0.875rem; color: var(--of-muted); }

.plugin-grid {
    display: grid;
    gap: 16px;
    margin-top: 8px;
}
@media (min-width: 640px) {
    .plugin-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
    .plugin-grid { grid-template-columns: repeat(3, 1fr); }
}
.plugin-card {
    padding: 20px 22px;
    background: var(--of-card);
    border: 1px solid var(--of-border);
    border-radius: 12px;
    border-left: 4px solid var(--of-primary);
}
.plugin-card__top {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.plugin-card__icon {
    font-size: 1.45rem;
    line-height: 1;
    flex-shrink: 0;
}
.plugin-card__meta { flex: 1; min-width: 0; }
.plugin-card__tag {
    display: inline-block;
    margin-bottom: 4px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--of-primary);
}
.plugin-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.plugin-card__hl {
    margin: 0 0 10px;
    font-size: 0.8125rem;
    color: var(--of-success);
    font-weight: 600;
    line-height: 1.4;
}
.plugin-card p { margin: 0; font-size: 0.875rem; color: var(--of-muted); }

.plugin-more {
    margin-top: 28px;
    padding: 18px 20px;
    background: #fff;
    border: 1px dashed var(--of-border);
    border-radius: 12px;
    font-size: 0.875rem;
    color: var(--of-muted);
    text-align: center;
}

.bullets {
    margin: 24px 0 0;
    padding-left: 1.2em;
    color: var(--of-muted);
    font-size: 0.9375rem;
}
.bullets li { margin-bottom: 8px; }

.cta-bar {
    margin: 40px 0 24px;
    padding: 24px;
    text-align: center;
    background: linear-gradient(135deg, #1e40af, var(--of-primary));
    border-radius: 14px;
    color: #fff;
}
.cta-bar h3 { margin: 0 0 8px; font-size: 1.15rem; }
.cta-bar p { margin: 0 0 16px; opacity: 0.9; font-size: 0.875rem; }
.cta-bar a {
    display: inline-block;
    padding: 10px 22px;
    background: #fff;
    color: var(--of-primary) !important;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
}
.cta-bar a:hover { text-decoration: none; filter: brightness(0.98); }

.site-footer {
    padding: 28px 24px;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--of-muted);
    border-top: 1px solid var(--of-border);
    background: #fff;
}
.site-footer__company {
    margin-bottom: 6px;
    font-size: 0.8125rem;
    color: var(--of-text);
}
.site-footer__beian {
    display: inline-block;
    color: var(--of-muted) !important;
    text-decoration: none;
}
.site-footer__beian:hover {
    color: var(--of-primary) !important;
    text-decoration: underline;
}
.site-footer__nav {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--of-border);
}
.site-footer__nav a {
    color: var(--of-primary);
}

/* —— 小程序 / 后台 双栏与功能表（官网模块说明） —— */
.section--dual {
    padding: 28px 0 8px;
    background: #fff;
    border-bottom: 1px solid var(--of-border);
}
.dual-intro {
    margin: 0 0 22px;
    text-align: center;
    color: var(--of-muted);
    font-size: 0.9rem;
    line-height: 1.65;
    max-width: 52em;
    margin-left: auto;
    margin-right: auto;
}
.dual-intro strong { color: var(--of-text); }
.dual-grid {
    display: grid;
    gap: 22px;
    align-items: start;
}
@media (min-width: 900px) {
    .dual-grid { grid-template-columns: 1fr 1fr; }
}
.dual-col {
    min-width: 0;
}
.dual-kicker {
    display: inline-block;
    margin-bottom: 10px;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}
.dual-kicker--mp {
    background: #ecfdf5;
    color: #047857;
}
.dual-kicker--adm {
    background: #eff6ff;
    color: #1d4ed8;
}
.dual-note {
    margin: 0 0 12px;
    font-size: 0.8125rem;
    color: var(--of-muted);
    line-height: 1.55;
}
.table-wrap {
    overflow-x: auto;
    margin: 0 0 8px;
    border-radius: 10px;
    border: 1px solid var(--of-border);
    background: var(--of-card);
}
.feature-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}
.feature-table th,
.feature-table td {
    padding: 10px 12px;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--of-border);
}
.feature-table tr:last-child th,
.feature-table tr:last-child td {
    border-bottom: none;
}
.feature-table th {
    background: #f8fafc;
    color: var(--of-text);
    font-weight: 600;
    width: 28%;
    white-space: nowrap;
}
.feature-table td {
    color: #475569;
    line-height: 1.5;
}
.feature-table .fn-name {
    font-weight: 600;
    color: var(--of-text);
}
.deep-dive {
    margin: 28px 0 8px;
    padding: 20px 22px;
    background: linear-gradient(180deg, #f8fafc 0%, #fff 100%);
    border: 1px solid var(--of-border);
    border-radius: 12px;
}
.deep-dive h3 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    color: var(--of-primary);
}
.deep-dive p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--of-muted);
    line-height: 1.65;
}
.deep-dive + .deep-dive {
    margin-top: 16px;
}

/* —— 同城商圈大篇章（local.html） —— */
.hub-chapter {
    padding: 36px 0 44px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 55%, #fff 100%);
    border-bottom: 1px solid var(--of-border);
}
.hub-kicker {
    display: inline-block;
    margin: 0 0 12px;
    padding: 5px 14px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: #1d4ed8;
    background: #eff6ff;
}
.hub-h2 {
    margin: 0 0 14px;
    font-size: clamp(1.35rem, 3vw, 1.8rem);
    color: var(--of-text);
    line-height: 1.35;
}
.hub-lead {
    margin: 0 0 28px;
    font-size: 0.9375rem;
    color: var(--of-muted);
    line-height: 1.78;
    max-width: 58rem;
}
.hub-h3 {
    margin: 32px 0 12px;
    font-size: 1.12rem;
    color: var(--of-text);
}
.hub-p {
    margin: 0 0 18px;
    font-size: 0.9rem;
    color: #475569;
    line-height: 1.72;
    max-width: 58rem;
}
.hub-figure {
    margin: 20px 0 28px;
    padding: 14px 14px 18px;
    background: var(--of-card);
    border: 1px solid var(--of-border);
    border-radius: 14px;
    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.hub-svg {
    display: block;
    width: 100%;
    min-width: 680px;
    height: auto;
}
.hub-figure--diagram .hub-svg {
    min-width: 520px;
}
.hub-caption {
    margin: 14px 4px 0;
    font-size: 0.8125rem;
    color: var(--of-muted);
    line-height: 1.65;
}
.hub-caption strong {
    color: var(--of-text);
}
.hub-endpoints {
    display: grid;
    gap: 18px;
    margin: 22px 0 10px;
}
@media (min-width: 768px) {
    .hub-endpoints {
        grid-template-columns: 1fr 1fr;
    }
}
.hub-endpoint {
    padding: 20px 22px;
    background: var(--of-card);
    border: 1px solid var(--of-border);
    border-radius: 12px;
}
.hub-endpoint__icon {
    font-size: 1.65rem;
    display: block;
    margin-bottom: 8px;
}
.hub-endpoint__title {
    margin: 0 0 12px;
    font-size: 1rem;
    color: var(--of-text);
}
.hub-ul {
    margin: 0;
    padding-left: 1.15em;
    font-size: 0.875rem;
    color: #475569;
    line-height: 1.65;
}
.hub-ul li {
    margin-bottom: 6px;
}
.hub-table-wrap {
    margin-top: 12px;
}
.hub-matrix th:nth-child(1) {
    width: 10%;
}
.hub-matrix th:nth-child(2) {
    width: 26%;
}
.hub-matrix th:nth-child(3) {
    width: 38%;
}
.hub-matrix th:nth-child(4) {
    width: 12%;
}
@media (max-width: 900px) {
    .hub-matrix {
        font-size: 0.78rem;
    }
    .hub-matrix th,
    .hub-matrix td {
        padding: 8px 9px;
    }
}
.hub-callout {
    margin: 28px 0 4px;
    padding: 18px 20px;
    border-radius: 12px;
    border-left: 4px solid var(--of-primary);
    background: linear-gradient(90deg, #eff6ff 0%, #f8fafc 100%);
    font-size: 0.875rem;
    color: #1e3a5f;
    line-height: 1.68;
}

/* —— 平台 / 商家 / 行业 三层叙事 —— */
.pillar-grid {
    display: grid;
    gap: 20px;
    margin-top: 8px;
}
@media (min-width: 768px) {
    .pillar-grid { grid-template-columns: repeat(3, 1fr); }
}
.pillar-card {
    display: block;
    padding: 28px 24px;
    background: var(--of-card);
    border: 1px solid var(--of-border);
    border-radius: 14px;
    color: inherit;
    text-decoration: none !important;
    transition: box-shadow 0.2s, transform 0.2s;
    border-top: 4px solid var(--of-primary);
}
.pillar-card:hover {
    box-shadow: 0 14px 40px -14px rgba(15, 23, 42, 0.18);
    transform: translateY(-3px);
}
.pillar-card--platform { border-top-color: #2563eb; }
.pillar-card--merchant { border-top-color: #7c3aed; }
.pillar-card--industry { border-top-color: #059669; }
.pillar-card__kicker {
    display: inline-block;
    margin-bottom: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--of-muted);
}
.pillar-card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.pillar-card p { margin: 0; font-size: 0.875rem; color: var(--of-muted); line-height: 1.6; }
.pillar-card__link {
    display: inline-block;
    margin-top: 14px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--of-primary);
}
.pillar-card--merchant .pillar-card__link { color: #7c3aed; }
.pillar-card--industry .pillar-card__link { color: #059669; }

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 24px;
}
.hero__btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none !important;
}
.hero__btn--primary {
    background: #fff;
    color: #1e40af !important;
}
.hero__btn--ghost {
    border: 1px solid rgba(255, 255, 255, 0.45);
    color: #f8fafc !important;
}
.hero__btn:hover { filter: brightness(0.98); }

.role-table th:nth-child(1) { width: 18%; }
.role-table .role-platform { color: #2563eb; font-weight: 600; }
.role-table .role-merchant { color: #7c3aed; font-weight: 600; }
.role-table .role-industry { color: #059669; font-weight: 600; }

.flow-diagram {
    margin: 28px auto;
    max-width: 720px;
    padding: 24px;
    background: #fff;
    border: 1px solid var(--of-border);
    border-radius: 14px;
    text-align: center;
    font-size: 0.875rem;
    color: var(--of-muted);
    line-height: 1.8;
}
.flow-diagram strong { color: var(--of-text); }

.industry-group { margin-bottom: 36px; }
.industry-group__title {
    margin: 0 0 6px;
    font-size: 1.1rem;
    padding-left: 12px;
    border-left: 4px solid var(--of-primary);
}
.industry-group__desc {
    margin: 0 0 16px;
    font-size: 0.8125rem;
    color: var(--of-muted);
    padding-left: 16px;
}
.card__badge {
    display: inline-block;
    margin-top: 10px;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 600;
    background: #f1f5f9;
    color: var(--of-muted);
}

/* —— H5 / 手机端适配 —— */
.site-nav__toggle {
    display: none;
    flex-shrink: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 0;
    border: 1px solid var(--of-border);
    border-radius: 10px;
    background: #fff;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.site-nav__toggle span {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 1px;
    background: var(--of-text);
    transition: transform 0.2s, opacity 0.2s;
}
.site-nav--open .site-nav__toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.site-nav--open .site-nav__toggle span:nth-child(2) {
    opacity: 0;
}
.site-nav--open .site-nav__toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
    html {
        -webkit-text-size-adjust: 100%;
        text-size-adjust: 100%;
    }
    body {
        overflow-x: hidden;
    }
    body.nav-open {
        overflow: hidden;
    }

    .site-nav {
        flex-wrap: nowrap;
        align-items: center;
        padding: 10px max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left));
    }
    .site-nav__brand {
        font-size: 1rem;
        max-width: calc(100% - 56px);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .site-nav__toggle {
        display: flex;
    }
    .site-nav__links,
    .site-nav__cta {
        display: none;
        order: 10;
        width: 100%;
    }
    .site-nav--open {
        flex-wrap: wrap;
    }
    .site-nav--open .site-nav__links,
    .site-nav--open .site-nav__cta {
        display: flex;
    }
    .site-nav--open .site-nav__links {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        margin-top: 8px;
        padding-top: 8px;
        border-top: 1px solid var(--of-border);
    }
    .site-nav--open .site-nav__links a {
        padding: 14px 4px;
        font-size: 1rem;
        border-bottom: 1px solid var(--of-border);
    }
    .site-nav--open .site-nav__links a:last-child {
        border-bottom: none;
    }
    .site-nav--open .site-nav__cta {
        justify-content: center;
        margin: 8px 0 4px;
        padding: 14px 18px;
    }

    .page-subnav {
        font-size: 0.8125rem;
        padding: 8px max(16px, env(safe-area-inset-right)) 8px max(16px, env(safe-area-inset-left));
    }

    .container {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }
    .hero {
        padding: 36px 16px 44px;
    }
    .page-hero {
        padding: 28px 16px 24px;
    }
    .section {
        padding: 36px 0;
    }
    .section h2 {
        font-size: 1.25rem;
    }

    .table-wrap {
        -webkit-overflow-scrolling: touch;
        border-radius: 8px;
    }
    .feature-table.role-table,
    .platform-mode-table,
    .hub-matrix {
        min-width: 520px;
    }
    .feature-table th {
        white-space: normal;
    }

    .merchant-flow {
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        font-size: 0.8125rem;
    }
    .merchant-flow span:not(.merchant-flow__step) {
        display: none;
    }
    .merchant-flow__step {
        display: block;
        width: 100%;
        text-align: center;
    }

    .scope-split {
        grid-template-columns: 1fr;
    }

    .cta-bar {
        margin-left: 0;
        margin-right: 0;
        padding: 20px 16px;
    }
    .cta-bar a {
        display: block;
        margin: 8px 0 0 !important;
    }
    .hero__actions {
        flex-direction: column;
        align-items: stretch;
    }
    .hero__btn {
        text-align: center;
    }

    .flow-diagram {
        padding: 18px 14px;
        font-size: 0.8125rem;
        text-align: left;
    }

    .arch-layer--2,
    .arch-layer--3,
    .arch-layer--4 {
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    .site-footer {
        padding-bottom: max(24px, env(safe-area-inset-bottom));
    }
}