* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif; }
html { height: 100%; }
body {
    min-height: 100%;
    display: flex;
    flex-direction: column;
    background-color: #f8fafc;
    color: #333;
    line-height: 1.6;
}
body > main,
body > .sf-page,
body > .shop-open-wrap,
body > #content {
    flex: 1 0 auto;
}

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 头部与导航（全站统一以首页为准） ===== */
.sf-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    box-shadow: none;
    position: sticky; top: 0; z-index: 1000;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    transition: box-shadow .22s ease;
}
.sf-header.is-scrolled {
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.06);
}
.sf-header .header-content {
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 15px 0;
    position: static;
}
.sf-logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 24px; font-weight: 700; color: #2c6ae5;
    text-decoration: none; flex-shrink: 0;
}
.sf-logo img { max-height: 36px; width: auto; display: block; }
.sf-ico { width: 1em; height: 1em; display: inline-block; vertical-align: -0.125em; fill: currentColor; flex-shrink: 0; }
.sf-logo .sf-ico { width: 1.2em; height: 1.2em; color: #2c6ae5; }

/* 菜单贴着左侧 logo */
.sf-nav {
    flex: 1;
    display: flex;
    justify-content: flex-start;
    min-width: 0;
}
.sf-nav ul {
    display: flex; list-style: none;
    gap: 28px; align-items: center;
    margin: 0; padding: 0;
}
.sf-nav a,
.sf-nav a:link,
.sf-nav a:visited {
    text-decoration: none;
    color: #1a1a2e !important;
    font-size: 15px !important;
    font-weight: 500;
    line-height: 1.4;
    outline: none;
    box-shadow: none;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.15s ease;
}
.sf-nav a:hover,
.sf-nav a:focus,
.sf-nav a:active,
.sf-nav a.active,
.sf-nav a.is-active,
.sf-nav a.is-active:link,
.sf-nav a.is-active:visited,
.sf-nav a.is-active:hover,
.sf-nav a.is-active:focus,
.sf-nav a.is-active:active {
    color: #2c6ae5 !important;
    outline: none;
    box-shadow: none;
    text-decoration: none;
    background: transparent;
}

.sf-cart-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    margin-left: auto;
    text-decoration: none;
    color: #1a1a2e !important;
    font-size: 15px !important;
    font-weight: 500;
    line-height: 1.4;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.15s ease;
}
.sf-cart-ico {
    display: block;
    width: 1em;
    height: 1em;
    flex-shrink: 0;
    fill: currentColor;
    vertical-align: middle;
    overflow: hidden;
}
.sf-cart-link:hover,
.sf-cart-link:focus,
.sf-cart-link:active {
    color: #2c6ae5 !important;
    text-decoration: none;
}

.sf-auth {
    display: flex; align-items: center; gap: 0.6rem;
    flex-shrink: 0;
}
.sf-auth a {
    display: inline-flex; align-items: center; justify-content: center;
    text-decoration: none; font-weight: 600; font-size: 15px !important;
    border-radius: 6px; padding: 0.45rem 1rem; transition: 0.2s;
    line-height: 1.4;
}
.sf-auth-entry,
.sf-auth-user {
    color: #fff !important;
    background: #0064ff;
    border: 1px solid transparent;
}
.sf-auth-entry:hover,
.sf-auth-user:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(44,106,229,0.28);
    color: #fff !important;
}

.menu-toggle {
    display: none;
    position: relative;
    width: 40px;
    height: 40px;
    margin: 0;
    padding: 0;
    flex-shrink: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    color: #1a1a2e;
}
.menu-toggle-bar {
    position: absolute;
    left: 9px;
    right: 9px;
    height: 2px;
    border-radius: 1px;
    background: currentColor;
    transition: transform .28s ease, opacity .2s ease, top .28s ease;
}
.menu-toggle-bar:nth-child(1) { top: 13px; }
.menu-toggle-bar:nth-child(2) { top: 19px; }
.menu-toggle-bar:nth-child(3) { top: 25px; }
.menu-toggle.is-open .menu-toggle-bar:nth-child(1) {
    top: 19px;
    transform: rotate(45deg);
}
.menu-toggle.is-open .menu-toggle-bar:nth-child(2) {
    opacity: 0;
}
.menu-toggle.is-open .menu-toggle-bar:nth-child(3) {
    top: 19px;
    transform: rotate(-45deg);
}

/* ===== 首页主视觉（跨境电商云） ===== */
.sf-home { overflow-x: hidden; }
.sf-hero {
    position: relative;
    padding: 88px 0 72px;
    text-align: left;
    color: #1a1a2e;
    overflow: hidden;
}
.sf-hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 58% 80% at 88% 20%, rgba(92, 158, 255, 0.26) 0%, transparent 58%),
        radial-gradient(ellipse 42% 55% at 8% 88%, rgba(44, 106, 229, 0.1) 0%, transparent 52%),
        linear-gradient(165deg, #e8f1ff 0%, #f4f8ff 42%, #f8fafc 100%);
    z-index: 0;
}
.sf-hero > .container {
    position: relative;
    z-index: 1;
}
.sf-hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 32px;
    min-height: 320px;
    animation: sf-hero-in .7s ease both;
}
@keyframes sf-hero-in {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: translateY(0); }
}
.sf-hero-copy {
    max-width: 560px;
}
.sf-hero-title {
    margin: 0 0 18px;
    font-size: clamp(2rem, 4.2vw, 3.15rem);
    line-height: 1.22;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #0f172a;
}
.sf-hero-title span { color: #2c6ae5; }
.sf-hero-desc {
    margin: 0 0 28px;
    max-width: 520px;
    font-size: 1.05rem;
    line-height: 1.75;
    color: #5a6a80;
}
.sf-hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 12px;
}
.sf-hero-visual {
    position: relative;
    height: 340px;
    pointer-events: none;
}
.sf-hero-orb {
    position: absolute;
    border-radius: 50%;
}
.sf-hero-orb-lg {
    right: 4%;
    top: 50%;
    width: min(360px, 100%);
    height: min(360px, 100%);
    margin-top: calc(min(360px, 100%) / -2);
    border: 1px solid rgba(44, 106, 229, 0.16);
    box-shadow:
        inset 0 0 0 42px rgba(255,255,255,0.35),
        inset 0 0 0 43px rgba(44,106,229,0.08);
    animation: sf-orbit 20s linear infinite;
}
.sf-hero-orb-sm {
    right: 18%;
    bottom: 18%;
    width: 140px;
    height: 140px;
    background: linear-gradient(145deg, rgba(44,106,229,0.18), rgba(92,158,255,0.05));
    animation: sf-float 7s ease-in-out infinite;
}
@keyframes sf-orbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
@keyframes sf-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
}
.btn-hero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, #2c6ae5, #5c9eff);
    color: white;
    padding: 0.95rem 1.8rem;
    font-size: 1rem;
    border: 1px solid transparent;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    text-decoration: none;
}
.btn-hero:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(44,106,229,0.3);
    color: #fff;
    text-decoration: none;
}
.btn-hero-ghost {
    background: #fff;
    color: #2c6ae5 !important;
    border-color: #c9dbff;
}
.btn-hero-ghost:hover {
    background: #f3f8ff;
    color: #1f5ad0 !important;
    box-shadow: 0 6px 16px rgba(44,106,229,0.12);
}

.sf-strip {
    position: relative;
    z-index: 1;
    margin-top: -28px;
    padding: 0 0 8px;
}
.sf-strip-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    box-shadow: 0 10px 28px rgba(15, 55, 120, 0.06);
    padding: 18px;
}
.sf-strip-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    border-right: 1px solid #eef2f7;
    border-radius: 10px;
    text-align: left;
    transition: background .2s ease;
}
.sf-strip-item:last-child { border-right: 0; }
.sf-strip-item:hover {
    background: #f3f8ff;
}
.sf-strip-item:hover .sf-strip-ico {
    background: #dbe8ff;
    color: #1f5ad0;
}
.sf-strip-ico {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #2c6ae5;
    background: #eef4ff;
    transition: background .2s ease, color .2s ease;
}
.sf-strip-ico svg {
    width: 20px;
    height: 20px;
    display: block;
}
.sf-strip-text {
    min-width: 0;
}
.sf-strip-text strong {
    display: block;
    margin-bottom: 4px;
    font-size: 16px;
    color: #0f172a;
}
.sf-strip-text span {
    display: block;
    font-size: 13px;
    color: #5a6a80;
    line-height: 1.5;
}

.sf-section { padding: 72px 0; }
.sf-section-soft {
    background:
        linear-gradient(180deg, #f3f7ff 0%, #f8fafc 100%);
}
.section-title { text-align: center; margin-bottom: 2.5rem; }
.section-title h2 {
    font-size: clamp(1.7rem, 3vw, 2.15rem);
    color: #0f172a;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}
.section-title p { color: #5a6a80; max-width: 640px; margin: 0 auto; }

.sf-caps {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}
.sf-cap {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 22px 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,.04);
    transition: transform .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.sf-cap:hover {
    transform: translateY(-4px);
    border-color: #c9dbff;
    background: #f7faff;
    box-shadow: 0 12px 28px rgba(44,106,229,.1);
}
.sf-cap:hover .sf-cap-icon {
    background: #dbe8ff;
    color: #1f5ad0;
}
.sf-cap:hover h3 { color: #2c6ae5; }
.sf-cap-icon {
    width: 42px;
    height: 42px;
    margin-bottom: 14px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #2c6ae5;
    background: #eef4ff;
    transition: background .2s ease, color .2s ease;
}
.sf-cap-icon svg { width: 22px; height: 22px; display: block; }
.sf-cap h3 {
    margin: 0 0 8px;
    font-size: 17px;
    color: #0f172a;
}
.sf-cap p {
    margin: 0;
    font-size: 14px;
    line-height: 1.7;
    color: #5a6a80;
}

.sf-scenes {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.sf-scene {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 26px 22px;
    box-shadow: 0 5px 15px rgba(0,0,0,.04);
    transition: transform .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.sf-scene:hover {
    transform: translateY(-4px);
    border-color: #c9dbff;
    background: #f7faff;
    box-shadow: 0 12px 28px rgba(44,106,229,.1);
}
.sf-scene:hover h3 { color: #2c6ae5; }
.sf-scene h3 {
    margin: 0 0 10px;
    font-size: 18px;
    color: #0f172a;
    transition: color .2s ease;
}
.sf-scene > p {
    margin: 0 0 14px;
    font-size: 14px;
    line-height: 1.7;
    color: #5a6a80;
}
.sf-scene ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
.sf-scene li {
    position: relative;
    padding: 7px 0 7px 16px;
    font-size: 14px;
    color: #334155;
    border-top: 1px solid #eef2f7;
}
.sf-scene li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 15px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #2c6ae5;
}

.sf-adv {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}
.sf-adv-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 22px 20px;
    transition: transform .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.sf-adv-item:hover {
    transform: translateY(-3px);
    border-color: #c9dbff;
    background: #f7faff;
    box-shadow: 0 10px 24px rgba(44,106,229,.08);
}
.sf-adv-item:hover h3 { color: #2c6ae5; }
.sf-adv-num {
    flex-shrink: 0;
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #2c6ae5;
    line-height: 1;
    padding-top: 2px;
}
.sf-adv-item h3 {
    margin: 0 0 6px;
    font-size: 17px;
    color: #0f172a;
    transition: color .2s ease;
}
.sf-adv-item p {
    margin: 0;
    font-size: 14px;
    line-height: 1.7;
    color: #5a6a80;
}

.sf-steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    counter-reset: sfstep;
}
.sf-steps li {
    position: relative;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 22px 18px 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,.04);
    counter-increment: sfstep;
    transition: transform .25s ease, border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.sf-steps li:hover {
    transform: translateY(-3px);
    border-color: #c9dbff;
    background: #f7faff;
    box-shadow: 0 10px 24px rgba(44,106,229,.08);
}
.sf-steps li:hover::before {
    background: #dbe8ff;
    color: #1f5ad0;
}
.sf-steps li:hover strong { color: #2c6ae5; }
.sf-steps li::before {
    content: counter(sfstep);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    margin-bottom: 12px;
    border-radius: 50%;
    background: #eef4ff;
    color: #2c6ae5;
    font-size: 13px;
    font-weight: 700;
    transition: background .2s ease, color .2s ease;
}
.sf-steps strong {
    display: block;
    margin-bottom: 6px;
    font-size: 16px;
    color: #0f172a;
    transition: color .2s ease;
}
.sf-steps span {
    display: block;
    font-size: 13px;
    line-height: 1.65;
    color: #5a6a80;
}

.sf-cta {
    padding: 24px 0 72px;
}
.sf-cta-inner {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 42px 44px;
    border-radius: 18px;
    overflow: hidden;
    color: #fff;
    background:
        radial-gradient(ellipse 55% 120% at 100% 0%, rgba(255,255,255,0.22) 0%, transparent 55%),
        radial-gradient(ellipse 45% 90% at 0% 100%, rgba(14, 40, 120, 0.35) 0%, transparent 50%),
        linear-gradient(125deg, #163f9c 0%, #2c6ae5 46%, #4f8fff 100%);
    box-shadow: 0 18px 40px rgba(44, 106, 229, 0.28);
}
.sf-cta-inner::before {
    content: '';
    position: absolute;
    right: -40px;
    top: -60px;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.22);
    box-shadow: inset 0 0 0 28px rgba(255,255,255,0.06);
    pointer-events: none;
}
.sf-cta-inner::after {
    content: '';
    position: absolute;
    right: 90px;
    bottom: -70px;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    pointer-events: none;
}
.sf-cta-copy,
.sf-cta .btn-hero {
    position: relative;
    z-index: 1;
}
.sf-cta-inner h2 {
    margin: 0 0 8px;
    font-size: clamp(1.35rem, 2.4vw, 1.75rem);
    letter-spacing: -0.01em;
}
.sf-cta-inner p {
    margin: 0;
    opacity: 0.92;
    font-size: 15px;
    line-height: 1.7;
    max-width: 560px;
}
.sf-cta .btn-hero {
    flex-shrink: 0;
    background: #fff;
    color: #2c6ae5 !important;
}
.sf-cta .btn-hero:hover {
    background: #f3f8ff;
    color: #1f5ad0 !important;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.16);
}

.card {
    background: white; border-radius: 10px; padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); transition: transform 0.3s;
}
.card:hover { transform: translateY(-5px); }
.card h3 { margin-bottom: 1rem; color: #1a1a2e; }

/* ===== 页脚：品牌介绍 + 多栏链接 + 底栏 ===== */
.sf-footer {
    flex-shrink: 0;
    background: #fff;
    color: #5a6a80;
    border-top: 1px solid #e2e8f0;
    padding: 42px 0 24px;
    font-size: 14px;
    line-height: 1.6;
}
.sf-footer-top {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1.65fr);
    gap: 36px;
    padding-bottom: 28px;
    border-bottom: 1px solid #eef2f7;
}
.sf-footer-about { max-width: 420px; }
.sf-footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #1a1a2e;
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
    margin-bottom: 12px;
}
.sf-footer-logo img {
    max-height: 32px;
    width: auto;
    display: block;
}
.sf-footer-logo .sf-ico {
    width: 1.1em;
    height: 1.1em;
    color: #2c6ae5;
}
.sf-footer-tagline {
    margin: 0;
    font-size: 13px;
    line-height: 1.75;
    color: #5a6a80;
}
.sf-footer-cols {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}
.sf-footer-col h4 {
    margin: 0 0 12px;
    font-size: 14px;
    font-weight: 700;
    color: #0f172a;
}
.sf-footer-col a {
    display: block;
    margin: 0 0 8px;
    color: #5a6a80;
    text-decoration: none;
    font-size: 14px;
}
.sf-footer-col a:hover { color: #2c6ae5; }
.sf-footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    padding-top: 18px;
}
.sf-footer-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 18px;
}
.sf-footer-nav a {
    color: #5a6a80;
    text-decoration: none;
    font-size: 13px;
}
.sf-footer-nav a:hover { color: #2c6ae5; }
.sf-footer-copy {
    margin-left: auto;
    font-size: 13px;
    font-weight: 500;
    color: #64748b;
    letter-spacing: 0.01em;
}
.sf-footer-copy a {
    color: #5a6a80;
    text-decoration: none;
    font-weight: 500;
}
.sf-footer-copy a:hover { color: #2c6ae5; }
.sf-footer-dot { margin: 0 8px; color: #cbd5e1; font-weight: 400; }

/* 回到顶部 */
.sf-backtop {
    position: fixed;
    right: 30px;
    bottom: 100px;
    z-index: 1200;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid #e2e8f0;
    border-radius: 50%;
    background: #fff;
    color: #2c6ae5;
    box-shadow: 0 5px 15px rgba(0,0,0,.08);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity .2s ease, visibility .2s, transform .2s ease;
}
.sf-backtop.is-show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.sf-backtop:hover { background: #f3f8ff; }
.sf-backtop svg { display: block; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
    .sf-hero-layout {
        grid-template-columns: 1fr;
        min-height: 0;
    }
    .sf-hero-visual {
        display: none;
    }
    .sf-strip-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sf-strip-item:nth-child(2n) { border-right: 0; }
    .sf-strip-item:nth-child(-n+2) { border-bottom: 1px solid #eef2f7; }
    .sf-caps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sf-scenes { grid-template-columns: 1fr; }
    .sf-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sf-footer-top { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 768px) {
    .sf-hero { padding: 52px 0 44px; text-align: left; }
    .sf-hero-layout {
        grid-template-columns: 1fr;
        min-height: 0;
        gap: 0;
    }
    .sf-hero-visual { display: none; }
    .sf-hero-copy { max-width: none; }
    .sf-hero-desc { font-size: 0.98rem; }
    .sf-hero-actions { justify-content: flex-start; }
    .sf-strip { margin-top: -16px; }
    .sf-strip-grid { grid-template-columns: 1fr; padding: 10px 12px; }
    .sf-strip-item {
        border-right: 0;
        border-bottom: 1px solid #eef2f7;
    }
    .sf-strip-item:last-child { border-bottom: 0; }
    .sf-caps,
    .sf-adv,
    .sf-steps { grid-template-columns: 1fr; }
    .sf-section { padding: 52px 0; }
    .sf-cta-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 30px 22px;
    }
    .sf-cta-inner::before { right: -70px; top: -90px; }
    .sf-footer-cols { grid-template-columns: 1fr; gap: 22px; }

    .sf-header .header-content { gap: 10px; }
    .sf-cart-link { display: none !important; }
    .sf-auth { margin-left: auto; }
    .sf-auth a { padding: 0.4rem 0.75rem; font-size: 14px !important; }
    .menu-toggle { display: inline-flex; }
    .sf-nav {
        position: fixed;
        top: var(--sf-header-h, 64px);
        left: 0;
        right: 0;
        width: 100vw;
        max-width: 100vw;
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        flex: none;
        display: block;
        justify-content: stretch;
        background: #fff;
        border-bottom: 1px solid #e2e8f0;
        box-shadow: 0 10px 28px rgba(26, 34, 51, 0.08);
        z-index: 999;
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        visibility: hidden;
        pointer-events: none;
        transition: max-height .32s ease, opacity .24s ease, visibility .24s;
    }
    .sf-nav.is-open {
        max-height: 70vh;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }
    .sf-nav ul {
        display: flex;
        flex-direction: column;
        width: 100%;
        gap: 0;
        align-items: stretch;
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    .sf-nav li {
        width: 100%;
        border-bottom: 1px solid #e8edf4;
        box-sizing: border-box;
    }
    .sf-nav li:last-child { border-bottom: none; }
    .sf-nav a {
        display: block;
        width: 100%;
        box-sizing: border-box;
        padding: 14px 20px;
        font-size: 15px !important;
    }

    .sf-footer { padding: 36px 0 22px; }
    .sf-footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .sf-footer-copy {
        margin-left: 0;
        white-space: normal;
        font-size: 13px;
    }
}

/* ===== 购物车页壳（配合首页 UI） ===== */
.shop-catalog,
.cart-web-shell {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}
.main-with-padding { min-height: 50vh; }
.shop-buy-btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.55rem 1.2rem; border-radius: 6px; font-weight: 600;
    text-decoration: none; color: #fff !important;
    background: linear-gradient(90deg, #2c6ae5, #5c9eff);
    border: none; transition: 0.2s;
}
.shop-buy-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(44,106,229,0.28);
    color: #fff !important;
}
.shop-buy-btn--disabled,
.shop-buy-btn.shop-buy-btn--disabled {
    background: #c5cedd; box-shadow: none; transform: none; cursor: not-allowed;
}