/* 变量与重置 */
:root {
    --primary-dark: #0E182A;
    --secondary-blue: #0BA5E9;
    --gradient-start: #00D2FF;
    --gradient-end: #0BA5E9;
    --text-white: #FFFFFF;
    --text-gray: #94A3B8;
    --bg-light: #F8FAFC;
    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
}
html {
    scroll-behavior: smooth;
}
body {
    background-color: var(--bg-light);
    color: #1E293B;
    line-height: 1.6;
}
a {
    text-decoration: none;
    color: inherit;
}
ul, ol {
    list-style: none;
}
img {
    max-width: 100%;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}
.btn-primary {
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 15px rgba(11, 165, 233, 0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(11, 165, 233, 0.4);
}
.btn-outline {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.45);
    margin-left: 12px;
}
.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: #0f172a;
}
.section-title p {
    color: #64748b;
    font-size: 1.1rem;
    max-width: 720px;
    margin: 0 auto;
}

/* 头部 */
header {
    background: var(--primary-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    gap: 16px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.15rem;
    color: white;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    box-shadow: 0 4px 14px rgba(11, 165, 233, 0.35);
}
.logo-text {
    color: white;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}
.logo-text em {
    font-style: normal;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.logo-img {
    height: 48px;
    width: auto;
    display: block;
    object-fit: contain;
}
nav ul {
    display: flex;
    align-items: center;
    gap: 28px;
}
nav a {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    transition: 0.3s;
    position: relative;
}
nav a:hover,
nav a.active {
    color: white;
}
nav a.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -8px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}
.header-cta {
    padding: 10px 26px;
    font-size: 14px;
    flex-shrink: 0;
}
.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    background: transparent;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    margin-left: auto;
}
.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: white;
    border-radius: 2px;
    transition: 0.3s;
}
.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* HERO */
#hero {
    position: relative;
    background: var(--primary-dark);
    overflow: hidden;
    height: 620px;
}
#hero .hero-swiper {
    width: 100%;
    height: 100%;
}
.hero-slide {
    min-width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background-size: cover;
    background-position: center;
    padding: 0 20px;
}
.hero-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(11, 165, 233, 0.25) 0%, transparent 60%);
    pointer-events: none;
    z-index: 1;
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 860px;
}
.hero-eyebrow {
    display: inline-block;
    margin-bottom: 16px !important;
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(11, 165, 233, 0.18);
    border: 1px solid rgba(0, 210, 255, 0.35);
    color: #E0F2FE !important;
    font-size: 0.9rem !important;
    font-weight: 600;
}
.hero-content h1,
.hero-content .hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 15px;
    color: white;
}
.hero-content h1 span,
.hero-content .hero-title span {
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
/* 品牌定义块：便于 GEO 抓取 */
.about-geo {
    padding: 40px 0 10px;
    background: white;
}
.about-geo-card {
    max-width: 920px;
    margin: 0 auto;
    padding: 28px 32px;
    border-radius: 16px;
    background: linear-gradient(135deg, #F0F9FF 0%, #F8FAFC 100%);
    border: 1px solid #e2e8f0;
}
.about-geo-card h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 12px;
}
.about-geo-card p {
    color: #475569;
    font-size: 1rem;
    line-height: 1.85;
}
.about-geo-card strong {
    color: #0f172a;
}
.contact-info a {
    color: #E0F2FE;
}
.contact-info a:hover {
    color: white;
    text-decoration: underline;
}
.stats-grid-capability .stat-item h3 {
    font-size: 2.4rem;
}
.audience-grid,
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.scenario-grid {
    grid-template-columns: repeat(3, 1fr);
}
.audience-card,
.scenario-card {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 26px 22px;
    transition: 0.3s;
}
#audience {
    padding: 100px 0;
    background: var(--bg-light);
}
#services {
    background: white;
}
#scenarios {
    padding: 100px 0;
    background: var(--bg-light);
}
#process {
    background: white;
}
.audience-card:hover,
.scenario-card:hover {
    border-color: var(--secondary-blue);
    box-shadow: var(--card-shadow);
    transform: translateY(-3px);
}
.audience-card h3,
.scenario-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: #0f172a;
    line-height: 1.45;
}
.audience-card p,
.scenario-card p {
    color: #64748b;
    font-size: 0.92rem;
    line-height: 1.7;
}
.scenario-tag {
    display: inline-block;
    margin-bottom: 12px;
    padding: 4px 12px;
    border-radius: 999px;
    background: #E0F2FE;
    color: #0369A1;
    font-size: 0.8rem;
    font-weight: 700;
}
.service-points {
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px dashed #e2e8f0;
}
.service-points li {
    position: relative;
    padding-left: 14px;
    margin-bottom: 6px;
    color: #475569;
    font-size: 0.85rem;
}
.service-points li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--secondary-blue);
}
.form-group select {
    padding: 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    background: white;
    transition: 0.3s;
}
.form-group select:focus {
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(11, 165, 233, 0.1);
}
.hero-content p {
    color: var(--text-gray);
    font-size: 1.15rem;
    margin-bottom: 30px;
}
.hero-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}
.hero-actions .btn-outline {
    margin-left: 0;
}
.hero-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}
.dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
}
.dot.active {
    background: white;
    width: 25px;
    border-radius: 10px;
}
.dot:hover {
    background: rgba(255, 255, 255, 0.6);
}

/* AI 平台覆盖 */
#platforms {
    padding: 28px 0;
    background: white;
    border-bottom: 1px solid #e2e8f0;
}
.platforms-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.platforms-label {
    font-weight: 700;
    color: #0f172a;
    white-space: nowrap;
}
.platforms-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: flex-end;
    flex: 1;
}
.platforms-list li {
    padding: 8px 18px;
    border-radius: 999px;
    background: #F1F5F9;
    color: #334155;
    font-weight: 600;
    font-size: 0.92rem;
    border: 1px solid #e2e8f0;
    transition: 0.3s;
}
.platforms-list li:hover {
    border-color: var(--secondary-blue);
    color: var(--secondary-blue);
    background: #E0F2FE;
}

/* 数据统计 */
#stats {
    padding: 80px 0;
    background: var(--bg-light);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}
.stat-item h3 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 5px;
    display: inline-block;
}
.stat-item p {
    color: #475569;
    font-weight: 500;
}
@keyframes elasticPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}
.count-elastic {
    animation: elasticPop 0.4s ease-out;
}

/* 为什么要做 GEO */
#why-geo {
    padding: 100px 0;
    background: white;
}
.why-geo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.why-geo-card {
    padding: 32px;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    background: #fff;
    transition: 0.3s;
}
.why-geo-card:hover {
    box-shadow: var(--card-shadow);
    border-color: var(--secondary-blue);
    transform: translateY(-4px);
}
.why-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #00D2FF, #0BA5E9);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 20px;
}
.why-geo-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #0f172a;
}
.why-geo-card p {
    color: #64748b;
    font-size: 0.95rem;
}
.why-geo-card strong {
    color: #334155;
}

/* SEO vs GEO 对比战 */
#diff {
    padding: 100px 0;
    background: #fff;
}
.diff-battle {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto auto;
    column-gap: 0;
    row-gap: 16px;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 16px 40px -20px rgba(14, 24, 42, 0.25);
}
.diff-side {
    display: grid;
    grid-template-rows: subgrid;
    grid-row: span 4;
    row-gap: 16px;
    padding: 36px 32px 40px;
    min-width: 0;
    align-content: start;
}
.diff-side-seo {
    background: linear-gradient(160deg, #E8F4FF 0%, #F3F9FF 55%, #FFFFFF 100%);
}
.diff-side-geo {
    background: linear-gradient(200deg, #FFE8F0 0%, #FFF5F8 55%, #FFFFFF 100%);
    text-align: right;
}
.diff-side-head {
    margin-bottom: 0;
    min-height: 96px;
}
.diff-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.diff-side-geo .diff-brand {
    justify-content: flex-end;
}
.diff-brand strong {
    font-size: 1.75rem;
    font-weight: 800;
}
.diff-side-seo .diff-brand strong {
    color: #2563EB;
}
.diff-side-geo .diff-brand strong {
    color: #E11D48;
}
.diff-brand-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}
.diff-brand-icon.seo {
    background: linear-gradient(135deg, #38BDF8, #2563EB);
}
.diff-brand-icon.geo {
    background: linear-gradient(135deg, #FB7185, #E11D48);
}
.diff-engines {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.diff-side-geo .diff-engines {
    justify-content: flex-end;
}
.diff-engines span {
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(37, 99, 235, 0.15);
    color: #334155;
}
.diff-engines.geo span {
    border-color: rgba(225, 29, 72, 0.18);
}
.diff-block {
    background: white;
    border-radius: 16px;
    padding: 20px 22px;
    box-shadow: 0 8px 24px -16px rgba(15, 23, 42, 0.35);
    border: 1px solid rgba(226, 232, 240, 0.9);
    height: 100%;
    display: flex;
    flex-direction: column;
}
.diff-block h4 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: #0f172a;
}
.diff-side-seo .diff-block h4 {
    color: #1D4ED8;
}
.diff-side-geo .diff-block h4 {
    color: #BE123C;
}
.diff-block p {
    color: #64748b;
    font-size: 0.9rem;
    line-height: 1.7;
    flex: 1;
}
/* 不支持 subgrid 时，两侧卡片尽量等高 */
@supports not (grid-template-rows: subgrid) {
    .diff-battle {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: none;
        row-gap: 0;
    }
    .diff-side {
        display: flex;
        flex-direction: column;
        grid-row: auto;
        gap: 16px;
    }
    .diff-block {
        flex: 1;
        min-height: 148px;
    }
}
.diff-vs-badge {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    font-weight: 900;
    color: white;
    background: linear-gradient(135deg, #F43F5E, #E11D48);
    box-shadow: 0 10px 28px rgba(225, 29, 72, 0.45);
    border: 4px solid white;
    pointer-events: none;
    grid-column: 1 / -1;
    grid-row: 1 / -1;
    justify-self: center;
    align-self: center;
    margin: 0;
}

/* 为什么选择梧弘 */
#advantages {
    padding: 100px 0;
    background: white;
}
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.advantage-card {
    padding: 28px;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    transition: 0.3s;
    display: flex;
    flex-direction: column;
}
.advantage-card:hover {
    box-shadow: var(--card-shadow);
    border-color: var(--secondary-blue);
    transform: translateY(-4px);
}
.advantage-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}
.advantage-card p {
    color: #64748b;
    font-size: 0.92rem;
    margin-bottom: 18px;
    flex: 1;
}
.service-link {
    color: var(--secondary-blue);
    font-weight: 600;
    font-size: 0.9rem;
}
.service-link:hover {
    text-decoration: underline;
}

/* 核心业务 */
#services {
    padding: 100px 0;
    background: var(--bg-light);
}
.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.service-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid transparent;
    transition: 0.3s;
    text-align: left;
}
.service-card:hover {
    border-color: var(--secondary-blue);
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}
.service-card .icon-wrap {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #00D2FF, #0BA5E9);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    margin-bottom: 15px;
}
.service-card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}
.service-card p {
    color: #64748b;
    font-size: 0.9rem;
}

/* 合作流程 */
#process {
    padding: 100px 0;
    background: white;
}
.process-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.process-item {
    display: flex;
    gap: 16px;
    padding: 24px;
    border-radius: 16px;
    background: var(--bg-light);
    border: 1px solid #e2e8f0;
    transition: 0.3s;
}
.process-item:hover {
    border-color: var(--secondary-blue);
    box-shadow: var(--card-shadow);
}
.process-num {
    flex-shrink: 0;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: white;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}
.process-item h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: #0f172a;
}
.process-item p {
    color: #64748b;
    font-size: 0.9rem;
}

/* 客户案例 */
#cases {
    padding: 100px 0;
    background: var(--bg-light);
}
.case-tabs {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    background: #F1F5F9;
    padding: 10px 20px;
    border-radius: 50px;
    max-width: fit-content;
    margin-left: auto;
    margin-right: auto;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.case-tabs::-webkit-scrollbar {
    display: none;
}
.case-tab {
    padding: 8px 24px;
    border-radius: 50px;
    font-weight: 600;
    color: #475569;
    cursor: pointer;
    transition: 0.3s;
    font-size: 0.95rem;
    white-space: nowrap;
    flex-shrink: 0;
    user-select: none;
}
.case-tab:hover {
    color: #0f172a;
}
.case-tab.active {
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 10px rgba(11, 165, 233, 0.3);
}
.case-content-wrapper {
    background: #F8FAFC;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
    position: relative;
    cursor: grab;
}
.case-content-wrapper:active {
    cursor: grabbing;
}
.case-content-wrapper .swiper {
    width: 100%;
    height: 100%;
}
.case-slide {
    display: flex;
    flex-direction: row;
    align-items: center;
    background: #fff;
    height: auto;
    min-height: 450px;
}
.case-text {
    flex: 1;
    padding: 50px;
    min-width: 300px;
}
.case-badge {
    display: inline-block;
    background: #DBEAFE;
    color: #1D4ED8;
    padding: 5px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 15px;
}
.case-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 20px;
    line-height: 1.4;
}
.case-text ul {
    margin-bottom: 30px;
}
.case-text ul li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: #1E293B;
}
.case-text ul li em {
    color: var(--secondary-blue);
    font-style: normal;
}
.case-cta {
    background: linear-gradient(90deg, #3B82F6, #2563EB);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.case-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}
.case-image-area {
    flex: 1.2;
    min-width: 300px;
    height: 450px;
    position: relative;
    overflow: hidden;
}
.case-image-area img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* FAQ */
#faq {
    padding: 100px 0;
    background: white;
}
.faq-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 0 auto 36px;
    max-width: 960px;
}
.faq-tab {
    padding: 8px 18px;
    border-radius: 999px;
    border: 1px solid #e2e8f0;
    background: #fff;
    color: #475569;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.25s;
}
.faq-tab:hover {
    border-color: var(--secondary-blue);
    color: var(--secondary-blue);
}
.faq-tab.active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
}
.faq-list {
    max-width: 920px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.faq-item {
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    background: #fff;
    overflow: hidden;
    transition: 0.3s;
    box-shadow: 0 6px 18px -14px rgba(15, 23, 42, 0.35);
}
.faq-item.hidden {
    display: none;
}
.faq-item[open],
.faq-item:hover {
    border-color: rgba(11, 165, 233, 0.4);
    box-shadow: var(--card-shadow);
}
.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 52px 18px 20px;
    font-weight: 700;
    color: #0f172a;
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-q {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-dark);
    color: white;
    font-size: 0.85rem;
    font-weight: 800;
}
.faq-question {
    flex: 1;
    text-align: left;
    line-height: 1.45;
}
.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #F1F5F9;
    color: var(--secondary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 500;
    transition: 0.3s;
}
.faq-item[open] summary::after {
    content: '−';
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}
.faq-answer {
    padding: 0 20px 20px 66px;
}
.faq-answer p {
    color: #64748b;
    font-size: 0.95rem;
    line-height: 1.75;
}
.faq-answer strong {
    color: #334155;
}

/* 联系我们 */
#contact {
    padding: 100px 0;
    background: var(--bg-light);
}
.contact-wrap {
    display: flex;
    flex-wrap: wrap;
    background: white;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}
.contact-info {
    flex: 1;
    background: var(--primary-dark);
    padding: 50px;
    color: white;
    min-width: 300px;
}
.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 30px;
}
.info-item {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    align-items: flex-start;
}
.info-item i {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-blue);
    font-size: 1rem;
}
.info-item strong {
    display: block;
    font-size: 1rem;
}
.info-item span {
    color: #94A3B8;
    font-size: 0.9rem;
}
.contact-form {
    flex: 1.5;
    padding: 50px;
    min-width: 300px;
}
.contact-form form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group.full {
    grid-column: span 2;
}
.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #1e293b;
}
.form-group label span {
    color: #ef4444;
}
.form-group input,
.form-group textarea {
    padding: 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: 0.3s;
    outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(11, 165, 233, 0.1);
}
.form-group textarea {
    height: 120px;
    resize: vertical;
}
.submit-btn {
    grid-column: span 2;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    padding: 12px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}
.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}
.submit-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 5px 20px rgba(11, 165, 233, 0.3);
}
.submit-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}
.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
}
.form-feedback {
    grid-column: span 2;
    margin-top: 4px;
    font-size: 0.9rem;
    line-height: 1.5;
    min-height: 1.4em;
    display: none;
}
.form-feedback.is-pending,
.form-feedback.is-success,
.form-feedback.is-error {
    display: block;
}
.form-feedback.is-pending {
    color: #64748b;
}
.form-feedback.is-success {
    color: #059669;
}
.form-feedback.is-error {
    color: #dc2626;
}

/* 页脚 */
footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 56px 0 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1.2fr;
    gap: 48px;
    margin-bottom: 36px;
    align-items: start;
}
.footer-brand p {
    max-width: 360px;
    line-height: 1.75;
    font-size: 0.92rem;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.footer-logo-img {
    height: 45px;
    width: auto;
    display: block;
    object-fit: contain;
}
.footer-col h5 {
    color: white;
    font-size: 1rem;
    margin-bottom: 18px;
    font-weight: 700;
}
.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 20px;
}
.footer-links li a:hover,
.footer-contact-list a:hover {
    color: white;
}
.footer-contact-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 18px;
}
.footer-contact-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.5;
    font-size: 0.92rem;
}
.footer-contact-list i {
    width: 18px;
    margin-top: 3px;
    color: var(--secondary-blue);
    flex-shrink: 0;
}
.footer-contact .social-icons {
    display: flex;
    gap: 10px;
}
.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    color: white;
    transition: 0.3s;
    position: relative;
}
.social-icons a:hover {
    background: var(--secondary-blue);
}
.wechat-icon {
    position: relative;
}
.qr-tooltip {
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 10px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    display: none;
    z-index: 999;
    white-space: nowrap;
}
.qr-tooltip img {
    width: 150px;
    height: 150px;
    object-fit: contain;
    display: block;
    border-radius: 8px;
}
.wechat-icon:hover .qr-tooltip,
.wechat-icon:active .qr-tooltip {
    display: block;
}
.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 22px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px 24px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.65);
}
.copyright-copy {
    margin: 0;
    line-height: 1.6;
}
.copyright-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}
.copyright-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.7);
    transition: 0.25s;
}
.copyright-links a:hover {
    color: white;
}
.beian-link img {
    width: 16px;
    height: 16px;
    display: block;
    flex-shrink: 0;
}

/* Reveal */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 1024px) {
    .service-grid,
    .advantage-grid,
    .audience-grid {
        grid-template-columns: 1fr 1fr;
    }
    .scenario-grid {
        grid-template-columns: 1fr;
    }
    .process-list {
        grid-template-columns: 1fr 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
    .diff-battle {
        display: flex;
        flex-direction: column;
        grid-template-columns: none;
        grid-template-rows: none;
        row-gap: 0;
    }
    .diff-side {
        display: flex;
        flex-direction: column;
        grid-row: auto;
        gap: 16px;
    }
    .diff-side-geo {
        text-align: left;
    }
    .diff-side-geo .diff-brand,
    .diff-side-geo .diff-engines {
        justify-content: flex-start;
    }
    .diff-vs-badge {
        position: relative;
        left: auto;
        top: auto;
        transform: none;
        margin: -12px auto;
    }
    .diff-block {
        min-height: 0;
        height: auto;
    }
}
@media (max-width: 768px) {
    .logo-mark {
        width: 34px;
        height: 34px;
        font-size: 1rem;
        border-radius: 10px;
    }
    .logo-text {
        font-size: 1.15rem;
    }
    .logo-img {
        height: 36px;
    }
    .footer-logo-img {
        height: 32px;
    }
    .nav-toggle {
        display: flex;
    }
    .header-cta {
        display: none;
    }
    #mainNav {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--primary-dark);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        padding: 16px 20px 24px;
    }
    #mainNav.open {
        display: block;
    }
    #mainNav ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    nav a.active::after {
        display: none;
    }
    .section-title h2 {
        font-size: 2rem;
    }
    .hero-content h1,
    .hero-content .hero-title {
        font-size: 2.4rem;
    }
    .about-geo-card {
        padding: 22px 20px;
    }
    .about-geo-card h2 {
        font-size: 1.25rem;
    }
    .hero-dots {
        bottom: 20px;
        gap: 10px;
    }
    .dot {
        width: 8px;
        height: 8px;
    }
    .dot.active {
        width: 22px;
    }
    .platforms-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    .platforms-list {
        justify-content: flex-start;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .why-geo-grid,
    .advantage-grid,
    .service-grid,
    .audience-grid,
    .scenario-grid,
    .process-list {
        grid-template-columns: 1fr;
    }
    .case-slide {
        flex-direction: column;
        min-height: auto;
    }
    .case-image-area {
        height: 250px;
        width: 100%;
        flex: none;
        min-width: unset;
    }
    .case-text {
        padding: 30px;
        flex: none;
        min-width: unset;
    }
    .case-content-wrapper {
        cursor: default;
    }
    .contact-form form {
        grid-template-columns: 1fr;
    }
    .form-group.full,
    .submit-btn {
        grid-column: span 1;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-brand {
        grid-column: auto;
    }
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
    .case-tabs {
        width: 90%;
        max-width: 100%;
        justify-content: flex-start;
        padding: 10px 16px;
        gap: 6px;
    }
    .case-tab {
        padding: 8px 18px;
        font-size: 0.85rem;
    }
    .copyright {
        flex-direction: column;
        align-items: flex-start;
    }
    .copyright-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .faq-tabs {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding-bottom: 4px;
    }
    .faq-tabs::-webkit-scrollbar {
        display: none;
    }
    .faq-tab {
        flex-shrink: 0;
    }
    .faq-answer {
        padding-left: 20px;
    }
}
@media (max-width: 480px) {
    .logo-img {
        height: 40px;
    }
    .footer-logo-img {
        height: 28px;
    }
    #hero {
        height: 540px;
    }
    .hero-content h1,
    .hero-content .hero-title {
        font-size: 2rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
    .hero-dots {
        bottom: 16px;
        gap: 8px;
    }
    .dot {
        width: 7px;
        height: 7px;
    }
    .dot.active {
        width: 20px;
    }
    .case-tabs {
        border-radius: 30px;
        padding: 8px 12px;
        gap: 4px;
    }
    .case-tab {
        padding: 6px 14px;
        font-size: 0.8rem;
        border-radius: 30px;
    }
    .case-text {
        padding: 20px;
    }
    .case-text h3 {
        font-size: 1.35rem;
    }
    .case-image-area {
        height: 200px;
    }
    .contact-info,
    .contact-form {
        padding: 30px 22px;
    }
}