/* ==========================================
   三方智研实验中心 - 主样式表
   ========================================== */

/* ========== CSS 变量系统 ========== */
:root {
    --color-primary: #0056b3;
    --color-primary-dark: #003d80;
    --color-accent: #00a8cc;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 86, 179, 0.15);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-height: 72px;
}

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Source Han Sans CN', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-primary-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: 56px;
    font-size: 1.05rem;
}

/* ========== Header / Nav ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    background: transparent;
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-header.scrolled .logo {
    color: var(--color-primary-dark);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--color-accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-menu {
    display: flex;
    gap: 36px;
}

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    padding: 4px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.site-header.scrolled .nav-menu a {
    color: var(--color-text);
}

.site-header.scrolled .nav-menu a:hover {
    color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    transition: var(--transition);
    border-radius: 2px;
}

.site-header.scrolled .menu-toggle span {
    background: var(--color-text);
}

/* ========== Banner ========== */
.banner {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 50, 120, 0.85), rgba(0, 168, 204, 0.6));
                /* url('../assets/images/banner-bg.jpg') center / cover no-repeat; */
    background-attachment: fixed;
    text-align: center;
    color: #fff;
    padding: 0 24px;
}

.banner-content {
    max-width: 800px;
}

.banner h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.banner p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    opacity: 0.9;
    margin-bottom: 36px;
    line-height: 1.8;
}

.btn {
    display: inline-block;
    padding: 14px 40px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========== Advantages ========== */
.advantages {
    background: var(--color-bg);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.adv-card {
    text-align: center;
    padding: 40px 24px;
    border-radius: var(--radius);
    transition: var(--transition);
    border: 1px solid transparent;
}

.adv-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.adv-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #fff;
    transition: var(--transition);
}

.adv-card:hover .adv-icon {
    transform: scale(1.1) rotate(5deg);
}

.adv-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--color-primary-dark);
}

.adv-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ========== Services ========== */
.services {
    background: var(--color-bg-alt);
}

.svc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.svc-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.svc-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.svc-img {
    height: 180px;
    background: var(--color-bg-alt);
    overflow: hidden;
}

.svc-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.svc-card:hover .svc-img img {
    transform: scale(1.05);
}

.svc-body {
    padding: 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.svc-body h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--color-primary-dark);
    transition: var(--transition);
}

.svc-card:hover .svc-body h3 {
    color: var(--color-primary);
}

.svc-body p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    flex: 1;
    margin-bottom: 16px;
}

.svc-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.svc-link:hover {
    gap: 10px;
}

/* ========== About ========== */
.about {
    background: var(--color-bg);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about-img img {
    width: 100%;
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--color-text-light);
    margin-bottom: 16px;
    font-size: 1rem;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 28px;
}

.stat-item strong {
    display: block;
    font-size: 2rem;
    color: var(--color-primary);
    font-weight: 700;
}

.stat-item span {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ========== Footer ========== */
.site-footer {
    background: #1a1a2e;
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    color: #fff;
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.8;
    opacity: 0.7;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 0.9rem;
    opacity: 0.7;
}

.footer-col ul li a:hover {
    opacity: 1;
    color: var(--color-accent);
}

.footer-col p {
    font-size: 0.6rem;
}

.contact-info li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
    opacity: 0.7;
}

.qr-code {
    width: 120px;
    border-radius: 8px;
    /* cursor: zoom-in; */
    transition: var(--transition);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

/* .qr-code:hover {
    border-color: var(--color-accent);
    transform: scale(1.05);
} */

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 0.8rem;
    opacity: 0.5;
}

.footer-bottom p {
    margin: 0;
}

.footer-beian {
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0;
}

.footer-beian a {
    color: inherit;
    opacity: 1;
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
}

.footer-beian a:hover {
    opacity: 0.8;
    color: var(--color-accent);
}

.beian-icon {
    width: 16px;
    height: 16px;
    vertical-align: middle;
    margin-right: 4px;
    position: relative;
    top: -1px;
}

.beian-sep {
    margin: 0 10px;
}

/* ========== Scroll Animation ========== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== QR Overlay ========== */
.qr-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
    animation: fadeIn 0.3s ease;
}

.qr-overlay img {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: 12px;
    box-shadow: 0 0 60px rgba(0, 168, 204, 0.3);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .adv-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        transition: var(--transition);
    }

    .nav-menu.open {
        transform: translateY(0);
    }

    .nav-menu a {
        color: var(--color-text) !important;
        padding: 14px 24px;
        display: block;
    }

    .nav-menu a::after {
        display: none;
    }

    .banner {
        min-height: 70vh;
        background-attachment: scroll;
    }

    .adv-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .adv-card {
        padding: 28px 20px;
    }

    .svc-grid {
        grid-template-columns: 1fr;
    }

    .section-padding {
        padding: 56px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-stats {
        gap: 24px;
    }

    .stat-item strong {
        font-size: 1.5rem;
    }
}

@font-face {
    font-family: 'Source Han Sans CN';
    src: url('../assets/fonts/SourceHanSansSC-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Source Han Sans CN';
    src: url('../assets/fonts/SourceHanSansSC-Medium.woff') format('woff');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Source Han Sans CN';
    src: url('../assets/fonts/SourceHanSansSC-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* --- 板块底部通用CTA --- */
.section-cta {
    text-align: center;
    margin-top: 56px;
    padding: 40px 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px dashed var(--color-border);
}

.services .section-cta {
    background: #fff;
}

.section-cta p {
    font-size: 1.05rem;
    color: var(--color-text-light);
    margin-bottom: 20px;
}

/* --- 首页服务概览网格 --- */
.svc-overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.svc-overview-card {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.svc-overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--color-accent);
    transition: var(--transition);
}

.svc-overview-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.svc-overview-card:hover::before {
    height: 100%;
}

.svc-ov-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #fff;
    flex-shrink: 0;
}

.svc-overview-card h3 {
    font-size: 1.1rem;
    color: var(--color-primary-dark);
    margin-bottom: 10px;
    line-height: 1.4;
}

.svc-overview-card p {
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 16px;
}

.svc-ov-arrow {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.svc-overview-card:hover .svc-ov-arrow {
    gap: 10px;
    color: var(--color-accent);
}

/* --- 详情页顶部Banner --- */
.page-banner {
    padding: calc(var(--header-height) + 60px) 0 60px;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: #fff;
    text-align: center;
}

.page-banner h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 1.05rem;
    opacity: 0.85;
    letter-spacing: 1px;
}

/* --- 响应式补充 --- */
@media (max-width: 768px) {
    .svc-overview-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .svc-overview-card {
        padding: 24px 20px;
    }

    .page-banner {
        padding: calc(var(--header-height) + 40px) 0 40px;
    }
}

/* --- 典型案例模块 --- */
.cases {
    background: var(--color-bg-alt);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.case-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.case-phase {
    padding: 28px 32px;
    position: relative;
    flex: 1;
}

.case-phase:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
}

.phase-label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.case-bg .phase-label {
    background: #e8f0fe;
    color: var(--color-primary);
}

.case-solution .phase-label {
    background: #e6f7fb;
    color: var(--color-accent);
}

.case-value .phase-label {
    background: #e8f5e9;
    color: #2e7d32;
}

.case-phase p {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.case-value p {
    color: var(--color-text);
    font-weight: 500;
}

/* --- 响应式补充 --- */
@media (max-width: 1024px) {
    .svc-detail-card,
    .svc-detail-card.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .svc-detail-img {
        min-height: 220px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section-cta {
        margin-top: 40px;
        padding: 32px 20px;
    }

    .section-cta p {
        font-size: 0.95rem;
    }

    .svc-detail-body {
        padding: 28px 20px;
    }

    .svc-detail-body h3 {
        font-size: 1.25rem;
    }

    .case-phase {
        padding: 20px 24px;
    }

    .phase-label {
        font-size: 0.65rem;
        letter-spacing: 1.5px;
    }
}

/* ==========================================
   增量补丁 v5.0 - 咨询二维码弹窗 + 帅气动画
   追加到 style.css 末尾
   ========================================== */

/* --- 弹窗遮罩层 --- */
.qr-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, background 0.4s ease, backdrop-filter 0.4s ease, visibility 0s linear 0.4s;
}

.qr-modal-overlay.active {
    opacity: 1;
    visibility: visible;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    transition: opacity 0.4s ease, background 0.4s ease, backdrop-filter 0.4s ease, visibility 0s linear 0s;
}

/* --- 弹窗主体卡片 --- */
.qr-modal-box {
    position: relative;
    background: #fff;
    border-radius: 20px;
    padding: 48px 40px 40px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    transform: scale(0.7) translateY(40px);
    opacity: 0;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
}

.qr-modal-overlay.active .qr-modal-box {
    transform: scale(1) translateY(0);
    opacity: 1;
}

/* 退场动画 */
.qr-modal-overlay.closing .qr-modal-box {
    transform: scale(0.85) translateY(20px);
    opacity: 0;
    transition: transform 0.3s ease-in, opacity 0.25s ease-in;
}

.qr-modal-overlay.closing {
    opacity: 0;
    transition: opacity 0.3s ease-in 0.05s, visibility 0s linear 0.35s;
    visibility: hidden;
}

/* --- 关闭按钮 --- */
.qr-modal-close {
    position: absolute;
    top: 14px;
    right: 18px;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-bg-alt);
    border-radius: 50%;
    font-size: 1.4rem;
    color: var(--color-text-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    line-height: 1;
}

.qr-modal-close:hover {
    background: #fee2e2;
    color: #dc2626;
    transform: rotate(90deg);
}

/* --- 脉冲光环图标 --- */
.qr-modal-icon-wrap {
    position: relative;
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-modal-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    position: relative;
    z-index: 2;
}

.qr-pulse-ring {
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    opacity: 0;
    animation: qrPulse 2s ease-out infinite;
    z-index: 1;
}

.qr-pulse-ring.delay {
    animation-delay: 0.6s;
}

@keyframes qrPulse {
    0% { transform: scale(1); opacity: 0.7; }
    100% { transform: scale(1.8); opacity: 0; }
}

/* --- 弹窗文字内容 --- */
.qr-modal-content h3 {
    font-size: 1.4rem;
    color: var(--color-primary-dark);
    margin-bottom: 8px;
}

.qr-modal-desc {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 24px;
}

/* --- 二维码图片 --- */
.qr-modal-img-wrap {
    width: 200px;
    height: 200px;
    margin: 0 auto 16px;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid var(--color-border);
    padding: 8px;
    background: #fff;
    transition: var(--transition);
}

.qr-modal-img-wrap:hover {
    border-color: var(--color-accent);
    transform: scale(1.03);
    box-shadow: 0 8px 24px rgba(0, 168, 204, 0.15);
}

.qr-modal-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.qr-modal-tip {
    font-size: 0.75rem;
    color: #aaa;
}

/* --- 响应式 --- */
@media (max-width: 480px) {
    .qr-modal-box {
        padding: 40px 24px 32px;
        border-radius: 16px;
    }

    .qr-modal-img-wrap {
        width: 170px;
        height: 170px;
    }

    .qr-modal-content h3 {
        font-size: 1.2rem;
    }
}

/* ==========================================
   增量补丁 v6.0 - Banner 动态粒子效果
   追加到 style.css 末尾
   ========================================== */

/* Canvas 绝对定位铺满 Banner */
#bannerParticles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none; /* 关键：允许鼠标事件穿透到下方按钮 */
}

/* 确保 Banner 内容层级高于粒子 */
.banner .banner-content {
    position: relative;
    z-index: 1;
}

/* ==========================================
   增量补丁 v7.0 - 关于我们数据可视化仪表盘
   追加到 style.css 末尾
   ========================================== */

.about-stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.stat-card:hover::after {
    transform: scaleX(1);
}

/* 数字与后缀同行显示 */
.stat-card .stat-number,
.stat-card .stat-suffix {
    display: inline-block;
    vertical-align: baseline;
}

.stat-number {
    font-size: clamp(2.2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    font-variant-numeric: tabular-nums; /* 等宽数字，避免跳动抖动 */
}

.stat-suffix {
    font-size: clamp(1rem, 2vw, 1.4rem);
    font-weight: 600;
    color: var(--color-accent);
    margin-left: 2px;
}

.stat-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-top: 12px;
    margin-bottom: 6px;
}

/* --- 响应式 --- */
@media (max-width: 992px) {
    .about-stats-dashboard {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .about-stats-dashboard {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .stat-card {
        padding: 24px 20px;
        display: flex;
        flex-wrap: wrap;
        align-items: baseline;
        justify-content: center;
        gap: 0 8px;
    }

    .stat-label {
        width: 100%;
        margin-top: 8px;
    }

    .stat-desc {
        width: 100%;
    }
}