/* =========================================================
   声卡销售网站 · 前台样式
   黑金科技风 / 移动端优先 / 响应式
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root {
    --bg:        #07070c;
    --bg-2:      #0c0c14;
    --bg-3:      #12121e;
    --card:      rgba(20, 20, 32, 0.72);
    --card-solid:#12121e;
    --gold:      #d4af37;
    --gold-2:    #f0d080;
    --gold-deep: #a8842a;
    --text:      #ece9df;
    --muted:     #9b98a8;
    --line:      rgba(212, 175, 55, 0.18);
    --line-2:    rgba(255, 255, 255, 0.08);
    --red:       #ff5a5a;
    --shadow-gold: 0 0 24px rgba(212, 175, 55, 0.25);
    --radius:    14px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
            "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
.container { width: min(1180px, 92%); margin: 0 auto; }
section { scroll-margin-top: 76px; }

/* 背景氛围 */
body::before {
    content: "";
    position: fixed; inset: 0; z-index: -2;
    background:
        radial-gradient(900px 500px at 85% -5%, rgba(212,175,55,.10), transparent 60%),
        radial-gradient(700px 500px at -10% 30%, rgba(212,175,55,.07), transparent 60%),
        var(--bg);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 26px; border-radius: 999px;
    font-size: 15px; font-weight: 600; letter-spacing: .5px;
    transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
    position: relative; overflow: hidden; white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 32px; font-size: 16px; width: 100%; }
.btn-gold {
    background: linear-gradient(135deg, var(--gold-2), var(--gold) 55%, var(--gold-deep));
    color: #1a1405;
    box-shadow: 0 6px 22px rgba(212, 175, 55, .35);
}
.btn-gold::after {
    content: ""; position: absolute; top: 0; left: -80%; width: 50%; height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255,255,255,.55), transparent);
    transform: skewX(-20deg); transition: left .6s ease;
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(212,175,55,.55); }
.btn-gold:hover::after { left: 130%; }
.btn-gold:active { transform: translateY(0); }
.btn-ghost {
    border: 1px solid var(--line);
    color: var(--gold-2);
    background: rgba(212,175,55,.06);
    backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: var(--gold); box-shadow: var(--shadow-gold); transform: translateY(-2px); }
.btn-outline { border: 1px solid var(--gold); color: var(--gold); }
.btn-outline:hover { background: rgba(212,175,55,.12); }

/* ---------- 顶部导航 ---------- */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
    border-bottom: 1px solid transparent;
}
.site-header.scrolled {
    background: rgba(7, 7, 12, .82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom-color: var(--line);
    box-shadow: 0 8px 30px rgba(0,0,0,.45);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-text {
    font-size: 20px; font-weight: 800; letter-spacing: 1px;
    background: linear-gradient(120deg, var(--gold-2), var(--gold));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.main-nav { display: flex; align-items: center; gap: 26px; }
.main-nav a {
    font-size: 15px; color: var(--muted); position: relative; padding: 6px 2px;
    transition: color .25s;
}
.main-nav a::after {
    content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
    background: linear-gradient(90deg, var(--gold), var(--gold-2));
    transition: width .3s ease; border-radius: 2px;
}
.main-nav a:hover, .main-nav a.nav-active { color: var(--gold-2); }
.main-nav a:hover::after, .main-nav a.nav-active::after { width: 100%; }
.nav-buy { margin-left: 6px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; z-index: 110; }
.nav-toggle span {
    width: 24px; height: 2px; background: var(--gold-2); border-radius: 2px;
    transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 150px 0 90px; text-align: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.orb-1 { width: 420px; height: 420px; background: rgba(212,175,55,.22); top: -120px; right: -80px; animation: float 9s ease-in-out infinite; }
.orb-2 { width: 360px; height: 360px; background: rgba(120,90,255,.13); bottom: -120px; left: -80px; animation: float 11s ease-in-out infinite reverse; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-28px); } }
.grid-lines {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(212,175,55,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212,175,55,.05) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
}
.scan-line {
    position: absolute; left: 0; right: 0; height: 2px; top: 30%;
    background: linear-gradient(90deg, transparent, rgba(212,175,55,.5), transparent);
    animation: scan 6s linear infinite;
}
@keyframes scan { 0% { top: 12%; opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } 100% { top: 85%; opacity: 0; } }

.hero-inner { position: relative; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 18px; border-radius: 999px; margin-bottom: 26px;
    border: 1px solid var(--line);
    background: rgba(212,175,55,.07);
    color: var(--gold-2); font-size: 14px; letter-spacing: 1px;
}
.hero-badge .dot {
    width: 8px; height: 8px; border-radius: 50%; background: var(--gold);
    box-shadow: 0 0 10px var(--gold); animation: blink 1.6s infinite;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
.hero-title {
    font-size: clamp(34px, 6vw, 60px); font-weight: 900; line-height: 1.25;
    letter-spacing: 2px; margin-bottom: 20px;
    background: linear-gradient(120deg, #fff8e1 10%, var(--gold-2) 45%, var(--gold) 70%, var(--gold-deep));
    -webkit-background-clip: text; background-clip: text; color: transparent;
    text-shadow: 0 0 60px rgba(212,175,55,.25);
}
.hero-sub { color: var(--muted); font-size: clamp(15px, 2.2vw, 18px); max-width: 640px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.hero-stats {
    display: flex; justify-content: center; gap: clamp(28px, 7vw, 80px);
    margin-top: 64px; flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-num, .stat-unit {
    font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--gold-2);
    text-shadow: 0 0 24px rgba(212,175,55,.4);
}
.stat-unit { font-size: clamp(18px, 2.4vw, 26px); }
.stat-label { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-title {
    font-size: clamp(26px, 4vw, 36px); font-weight: 800; letter-spacing: 2px;
    display: inline-block; position: relative;
}
.section-title::after {
    content: ""; display: block; width: 60%; height: 3px; margin: 12px auto 0;
    border-radius: 3px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.section-desc { color: var(--muted); margin-top: 14px; font-size: 15px; }

/* ---------- 分类 Tabs ---------- */
.tabs { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.tab {
    padding: 10px 30px; border-radius: 999px; font-size: 15px; font-weight: 600;
    border: 1px solid var(--line-2); color: var(--muted);
    background: rgba(255,255,255,.03);
    transition: all .25s ease;
}
.tab:hover { border-color: var(--line); color: var(--gold-2); }
.tab.active {
    background: linear-gradient(135deg, rgba(240,208,128,.18), rgba(212,175,55,.1));
    border-color: var(--gold); color: var(--gold-2);
    box-shadow: var(--shadow-gold);
}

/* ---------- 产品卡片 ---------- */
.product-grid {
    display: grid; gap: 26px;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}
.product-card {
    background: var(--card);
    border: 1px solid var(--line-2);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex; flex-direction: column;
    transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}
.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--line);
    box-shadow: 0 18px 44px rgba(0,0,0,.5), 0 0 0 1px rgba(212,175,55,.25), 0 0 34px rgba(212,175,55,.18);
}
.product-card.hidden { display: none; }

.card-media { position: relative; display: block; aspect-ratio: 1 / 1; overflow: hidden; background: var(--bg-3); }
.card-media img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform .5s ease;
}
.product-card:hover .card-media img { transform: scale(1.06); }
.card-tag {
    position: absolute; top: 12px; left: 12px; z-index: 2;
    padding: 4px 12px; border-radius: 999px; font-size: 12px; font-weight: 600;
    color: #1a1405; background: linear-gradient(135deg, var(--gold-2), var(--gold));
    box-shadow: 0 4px 14px rgba(0,0,0,.4);
}
.card-zoom {
    position: absolute; right: 12px; bottom: 12px; z-index: 2;
    width: 38px; height: 38px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: rgba(7,7,12,.7); color: var(--gold-2);
    border: 1px solid var(--line);
    opacity: 0; transform: translateY(8px);
    transition: opacity .3s, transform .3s;
}
.product-card:hover .card-zoom { opacity: 1; transform: translateY(0); }

.card-body { padding: 18px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.card-title { font-size: 17px; font-weight: 700; line-height: 1.45; }
.card-title a { transition: color .25s; }
.card-title a:hover { color: var(--gold-2); }
.card-summary {
    color: var(--muted); font-size: 13.5px; margin: 8px 0 14px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
    min-height: 44px;
}
.price-row { display: flex; flex-direction: column; align-items: stretch; gap: 10px; margin-bottom: 16px; }
.price-sub-row { display: flex; align-items: flex-end; gap: 16px; }
.price-our-mini { font-size: 15px; font-weight: 700; color: var(--gold-2); white-space: nowrap; }
.price-item { display: flex; flex-direction: column; }
.price-label { font-size: 12px; color: var(--muted); margin-bottom: 2px; }
.price-old { color: #7d7a8c; text-decoration: line-through; font-size: 15px; }
.price-guild-num {
    font-size: 26px; font-weight: 900; color: #2ecc71; white-space: nowrap;
    text-shadow: 0 0 18px rgba(46,204,113,.28);
}
.guild-save-mini {
    font-size: 11px; font-weight: 700; color: #2ecc71; white-space: nowrap; margin-top: 2px;
}
.save-badge.save-green {
    color: #7ee294;
    background: rgba(46,204,113,.12);
    border: 1px solid rgba(46,204,113,.4);
}
.price-now {
    font-size: 26px; font-weight: 900; color: var(--gold-2);
    text-shadow: 0 0 18px rgba(212,175,55,.35);
}
.card-foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.save-badge {
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 12.5px; font-weight: 700; color: #ffd9a8;
    padding: 5px 10px; border-radius: 8px;
    background: rgba(255, 90, 90, .12);
    border: 1px solid rgba(255, 90, 90, .3);
    white-space: nowrap;
}
.btn-buy { padding: 10px 20px; font-size: 14px; }

.empty-tip {
    text-align: center; color: var(--muted); padding: 60px 20px;
    border: 1px dashed var(--line); border-radius: var(--radius);
}

/* ---------- 关于我们 / 科普 ---------- */
.about-section { background: linear-gradient(180deg, transparent, rgba(212,175,55,.04), transparent); }
.about-card {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 20px; padding: clamp(26px, 5vw, 50px);
    backdrop-filter: blur(10px);
    box-shadow: 0 0 50px rgba(212,175,55,.08);
}
.about-intro { max-width: 820px; margin: 0 auto 44px; }
.about-intro p { color: #cfcbdb; margin-bottom: 14px; }
.desc-subtitle {
    color: var(--gold-2); font-size: 18px; margin: 24px 0 12px;
    padding-left: 14px; border-left: 3px solid var(--gold);
}
.feature-list { margin: 10px 0 18px; }
.feature-list li {
    position: relative; padding-left: 26px; margin-bottom: 10px; color: #d6d3e0;
}
.feature-list li::before {
    content: ""; position: absolute; left: 4px; top: 10px;
    width: 8px; height: 8px; border-radius: 2px;
    background: linear-gradient(135deg, var(--gold-2), var(--gold));
    box-shadow: 0 0 8px rgba(212,175,55,.6);
    transform: rotate(45deg);
}
.about-features {
    display: grid; gap: 22px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.feature-item {
    text-align: center; padding: 26px 18px;
    border: 1px solid var(--line-2); border-radius: 14px;
    background: rgba(255,255,255,.02);
    transition: transform .3s, border-color .3s, box-shadow .3s;
}
.feature-item:hover { transform: translateY(-6px); border-color: var(--line); box-shadow: var(--shadow-gold); }
.feature-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 58px; height: 58px; border-radius: 16px; margin-bottom: 14px;
    color: var(--gold-2);
    background: linear-gradient(135deg, rgba(240,208,128,.14), rgba(212,175,55,.06));
    border: 1px solid var(--line);
}
.feature-item h3 { font-size: 17px; margin-bottom: 6px; color: var(--text); }
.feature-item p { font-size: 13.5px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line-2); background: rgba(0,0,0,.35); margin-top: 40px; }
.footer-inner {
    display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap;
    padding: 46px 0 34px;
}
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 10px; }
.footer-contact h4 { color: var(--gold-2); font-size: 15px; margin-bottom: 10px; }
.footer-contact p { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.footer-bottom {
    border-top: 1px solid var(--line-2); padding: 18px 0;
    color: #6f6c7d; font-size: 13px; text-align: center;
}
.footer-bottom .copyright { margin-bottom: 6px; }
.footer-bottom .icp-link {
    color: #6f6c7d; text-decoration: none; font-size: 13px;
    transition: color .2s;
}
.footer-bottom .icp-link:hover { color: var(--gold-2); }

/* ---------- 购买弹窗 ---------- */
.modal-mask {
    position: fixed; inset: 0; z-index: 1000;
    background: rgba(4,4,8,.78); backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
    opacity: 0; visibility: hidden;
    transition: opacity .3s ease, visibility .3s;
}
.modal-mask.show { opacity: 1; visibility: visible; }
.modal-box {
    position: relative; width: min(380px, 100%);
    background: linear-gradient(160deg, #171726, #0e0e18);
    border: 1px solid var(--gold);
    border-radius: 20px;
    padding: 34px 28px 28px;
    text-align: center;
    box-shadow: 0 0 60px rgba(212,175,55,.3), 0 24px 60px rgba(0,0,0,.6);
    transform: translateY(24px) scale(.96);
    transition: transform .35s cubic-bezier(.2,.9,.3,1.3);
}
.modal-mask.show .modal-box { transform: translateY(0) scale(1); }
.modal-close {
    position: absolute; top: 10px; right: 14px;
    width: 36px; height: 36px; border-radius: 50%;
    font-size: 24px; line-height: 1; color: var(--muted);
    transition: color .25s, background .25s;
}
.modal-close:hover { color: var(--gold-2); background: rgba(212,175,55,.1); }
.modal-title {
    font-size: 20px; font-weight: 800; margin-bottom: 20px;
    background: linear-gradient(120deg, var(--gold-2), var(--gold));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.qr-wrap {
    position: relative; width: 220px; height: 220px; margin: 0 auto 18px;
    border-radius: 16px; overflow: hidden; background: #fff;
}
.qr-wrap img { width: 100%; height: 100%; object-fit: contain; padding: 10px; }
.qr-frame {
    position: absolute; inset: 0; pointer-events: none; border-radius: 16px;
    box-shadow: inset 0 0 0 3px rgba(212,175,55,.8);
}
.qr-placeholder {
    width: 100%; height: 100%; display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 6px;
    color: #888; font-size: 15px; background: #f5f5f5;
}
.modal-tip { color: var(--muted); font-size: 14px; }
.modal-product {
    margin-top: 10px; color: var(--gold-2); font-size: 14px; font-weight: 600;
}
.modal-contact { margin-top: 12px; font-size: 13.5px; color: #b9b6c6; border-top: 1px dashed var(--line-2); padding-top: 12px; }

/* ---------- 详情页 ---------- */
.detail-page { padding: 110px 0 60px; }
.breadcrumb { font-size: 14px; color: var(--muted); margin-bottom: 30px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--gold-2); }
.breadcrumb span { margin: 0 8px; color: #55525f; }
.breadcrumb b { color: var(--text); font-weight: 600; }

.detail-layout {
    display: grid; gap: 44px;
    grid-template-columns: 1fr 1fr;
    margin-bottom: 60px;
}
.gallery-main {
    position: relative; border-radius: 18px; overflow: hidden;
    border: 1px solid var(--line);
    background: var(--bg-3);
    aspect-ratio: 1/1;
}
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumbs { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.gallery-thumb {
    width: 76px; height: 76px; border-radius: 10px; overflow: hidden;
    border: 2px solid transparent; opacity: .6;
    transition: opacity .25s, border-color .25s;
    background: var(--bg-3); padding: 0;
}
.gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumb.active { opacity: 1; border-color: var(--gold); box-shadow: var(--shadow-gold); }
.gallery-thumb:hover { opacity: 1; }

.detail-name { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; line-height: 1.35; }
.detail-summary { color: var(--muted); margin: 14px 0 26px; font-size: 15.5px; }
.detail-price-box {
    border: 1px solid var(--line); border-radius: 16px;
    background: linear-gradient(150deg, rgba(212,175,55,.08), rgba(212,175,55,.02));
    padding: 22px 24px; margin-bottom: 26px;
}
.detail-price-row { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.detail-price-row:last-child { margin-bottom: 0; }
.detail-price-compare { display: flex; align-items: flex-end; gap: 32px; margin-bottom: 16px; }
.price-mini-item { display: flex; flex-direction: column; }
.price-md { font-size: 18px; }
.main-price { margin-bottom: 0; }
.detail-price-row.our, .detail-price-row.guild { align-items: baseline; flex-wrap: wrap; }
.price-lg { font-size: 20px; }
.price-xl { font-size: 40px; font-weight: 900; }
.detail-price-row .save-badge { font-size: 13px; }
.price-note { color: var(--muted); font-size: 13px; margin-top: 12px; }
.detail-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 24px; }
.detail-actions .btn-lg { width: auto; flex: 1; min-width: 180px; }
.detail-assure { display: flex; gap: 18px; flex-wrap: wrap; }
.detail-assure li {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--muted); font-size: 13.5px;
}

.detail-desc, .related-section { margin-bottom: 56px; }
.desc-title {
    display: flex; align-items: center; gap: 12px;
    font-size: 21px; font-weight: 800; margin-bottom: 22px;
}
.desc-title span {
    width: 5px; height: 22px; border-radius: 3px;
    background: linear-gradient(180deg, var(--gold-2), var(--gold-deep));
    box-shadow: 0 0 12px rgba(212,175,55,.6);
}
.desc-body {
    border: 1px solid var(--line-2); border-radius: 16px;
    background: var(--card); padding: clamp(22px, 4vw, 38px);
}
.desc-body p { color: #d3d0de; margin-bottom: 14px; }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .detail-layout { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 768px) {
    .main-nav {
        position: fixed; top: 0; right: 0; bottom: 0;
        width: min(300px, 80vw);
        flex-direction: column; align-items: flex-start;
        gap: 8px; padding: 90px 30px 30px;
        background: rgba(10,10,18,.96);
        backdrop-filter: blur(18px);
        border-left: 1px solid var(--line);
        transform: translateX(100%);
        transition: transform .35s ease;
        z-index: 105;
    }
    .main-nav.open { transform: translateX(0); box-shadow: -20px 0 60px rgba(0,0,0,.6); }
    .main-nav a { font-size: 17px; padding: 12px 0; width: 100%; border-bottom: 1px solid var(--line-2); }
    .main-nav .nav-buy { margin: 18px 0 0; width: 100%; }
    .nav-toggle { display: flex; }
    .hero { padding: 120px 0 70px; }
    .section { padding: 60px 0; }
    .footer-inner { flex-direction: column; gap: 24px; }
    .detail-actions .btn-lg { width: 100%; }
    .gallery-thumb { width: 64px; height: 64px; }
    /* 手机端产品卡片两列并排 + 紧凑卡片 */
    .product-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .card-body { padding: 14px 12px 16px; }
    .card-title { font-size: 14.5px; }
    .card-summary { min-height: 0; -webkit-line-clamp: 1; margin-bottom: 10px; }
    .card-foot { flex-direction: column; align-items: stretch; gap: 8px; }
    .card-foot .btn-buy { width: 100%; }
    .card-foot .save-badge { align-self: flex-start; }
    .price-guild-num { font-size: 21px; }
    .price-now { font-size: 21px; }
}
@media (max-width: 420px) {
    /* 超窄屏两列紧凑间距 */
    .product-grid { gap: 12px; }
    .card-body { padding: 12px 10px 14px; }
    .card-title { font-size: 13.5px; line-height: 1.4; }
    .card-summary { font-size: 12px; margin: 6px 0 10px; min-height: 0; -webkit-line-clamp: 1; }
    .card-tag { top: 8px; left: 8px; padding: 3px 9px; font-size: 11px; }
    .card-foot { flex-direction: column; align-items: stretch; gap: 8px; }
    .card-foot .btn-buy { width: 100%; padding: 9px 10px; font-size: 13px; }
    .card-foot .save-badge { align-self: flex-start; font-size: 11px; padding: 4px 8px; }
    .price-row { gap: 8px; margin-bottom: 12px; }
    .price-sub-row { gap: 12px; }
    .price-guild-num { font-size: 19px; color: #2ecc71 !important; text-shadow: 0 0 14px rgba(46,204,113,.28); }
    .guild-save-mini { font-size: 10px; color: #2ecc71; }
    .price-now { font-size: 19px; color: var(--gold-2) !important; }
    .price-old { font-size: 12px; color: #7d7a8c; }
    .price-our-mini { font-size: 12px; color: var(--gold-2) !important; }
    .price-label { font-size: 11px; }
    .hero-stats { gap: 24px; }
    .detail-price-compare { gap: 20px; }
    .price-md { font-size: 15px; }
}