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

:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --text: #1F2937;
    --text-light: #6B7280;
    --bg: #FFFFFF;
    --bg-gray: #F9FAFB;
    --border: #E5E7EB;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
}

.logo-icon {
    display: flex;
    align-items: center;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--text-light);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(160deg, #F0F0FF 0%, #E8EDFF 40%, #DDE4FF 100%);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to bottom, transparent, #fff);
    pointer-events: none;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.15);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.hero-content {
    position: relative;
    display: flex;
    align-items: center;
    gap: 48px;
    text-align: left;
    padding: 100px 24px 80px;
}

.hero-text {
    flex: 1;
    min-width: 0;
}

.hero-media {
    flex: 0 0 48%;
    max-width: 540px;
    animation: heroFloat 6s ease-in-out infinite;
    overflow: hidden;
    border-radius: 16px;
}

@keyframes heroFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.hero-media img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 25px 80px rgba(79, 70, 229, 0.12), 0 8px 24px rgba(0, 0, 0, 0.06);
    transform: scale(1.07);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-desc {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-light);
    max-width: 520px;
    margin: 0 0 40px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: flex-start;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-weibo {
    background: #E6162D;
    color: #fff;
    border-color: #E6162D;
}

.btn-weibo:hover {
    background: #C41024;
    border-color: #C41024;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(230, 22, 45, 0.3);
}

/* ===== Sections ===== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-light);
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.service-icon {
    margin-bottom: 24px;
    display: flex;
    justify-content: center;
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

.service-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Stats ===== */
.stats-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 80px 0;
}

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

.stat-item {
    text-align: center;
    color: #fff;
}

.stat-number {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    display: inline;
}

.stat-unit {
    font-size: 1.25rem;
    font-weight: 600;
    display: inline;
    opacity: 0.9;
}

.stat-label {
    font-size: 1rem;
    margin-top: 8px;
    opacity: 0.85;
}

/* ===== Cases ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

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

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.case-img {
    height: 200px;
    position: relative;
    display: flex;
    align-items: flex-end;
    padding: 20px;
    transform: scale(1.04);
}

.case-tag {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.case-info {
    padding: 24px;
}

.case-info h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.case-info p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Partners ===== */
.partners {
    background: var(--bg-gray);
}

.brand-wall {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

.brand-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 12px;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
    transition: var(--transition);
}

.brand-item:hover {
    border-color: var(--primary-light);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

/* ===== Scenarios ===== */
.scenarios {
    background: var(--bg-gray);
}

.scenarios-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.scenario-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.scenario-item:hover {
    border-color: var(--primary-light);
    color: var(--primary);
    transform: translateY(-2px);
}

.scenario-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

/* ===== About ===== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-light);
    margin-bottom: 20px;
}

/* ===== Contact ===== */
.contact {
    background: var(--bg-gray);
}

.contact-card {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: #fff;
    padding: 24px 32px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #EEF2FF;
    border-radius: 12px;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== Footer ===== */
.footer {
    background: #1F2937;
    padding: 32px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-contact {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.85rem;
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.55);
    transition: var(--transition);
}

.footer-contact a:hover {
    color: #fff;
}

.footer-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-company {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-divider {
    color: rgba(255, 255, 255, 0.3);
}

.footer-icp {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-icp:hover {
    color: #fff;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}

/* ===== Inner page components (multi-page site) ===== */
.nav-link.active {
    color: var(--primary);
}
.nav-link.active::after {
    width: 100%;
}

.page-hero {
    background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
    padding: 150px 0 64px;
    text-align: center;
}

.page-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 14px;
}

.page-hero p {
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 640px;
    margin: 0 auto;
}

.breadcrumb {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.breadcrumb a { transition: var(--transition); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 6px; opacity: 0.6; }

.prose { max-width: 820px; margin: 0 auto; }
.prose p { font-size: 1.02rem; line-height: 1.95; color: var(--text-light); margin-bottom: 18px; }
.prose h2 { font-size: 1.4rem; color: var(--text); margin: 32px 0 14px; }
.prose h3 { font-size: 1.15rem; color: var(--text); margin: 24px 0 10px; }
.prose ul { margin: 0 0 18px 22px; color: var(--text-light); line-height: 1.9; }
.prose a { color: var(--primary); }
.prose strong { color: var(--text); }

/* About intro two-column */
.about-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-intro-grid .prose {
    max-width: none;
    margin: 0;
}

.about-intro-media {
    overflow: hidden;
    border-radius: 12px;
}

.about-intro-media img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transform: scale(1.07);
}

/* About: timeline + info */
.timeline { max-width: 760px; margin: 0 auto; position: relative; padding-left: 28px; }
.timeline::before { content: ''; position: absolute; left: 6px; top: 4px; bottom: 4px; width: 2px; background: var(--border); }
.timeline-item { position: relative; padding: 0 0 32px 20px; }
.timeline-item::before { content: ''; position: absolute; left: -27px; top: 4px; width: 14px; height: 14px; border-radius: 50%; background: var(--primary); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--primary-light); }
.timeline-year { font-size: 1.15rem; font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.timeline-item h3 { font-size: 1.05rem; margin-bottom: 6px; color: var(--text); }
.timeline-item p { font-size: 0.95rem; color: var(--text-light); line-height: 1.75; }

.info-list { max-width: 760px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 32px; }
.info-row { display: flex; gap: 10px; font-size: 0.98rem; padding: 12px 0; border-bottom: 1px solid var(--border); }
.info-row .k { color: var(--text-light); min-width: 92px; flex-shrink: 0; }
.info-row .v { color: var(--text); font-weight: 500; }

/* Service detail rows */
.service-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 40px 0; border-bottom: 1px solid var(--border); }
.service-detail:nth-child(even) .service-detail-media { order: 2; }
.service-detail h3 { font-size: 1.4rem; color: var(--text); margin-bottom: 12px; }
.service-detail p { color: var(--text-light); line-height: 1.85; margin-bottom: 14px; }
.service-detail ul { margin: 0 0 4px 20px; color: var(--text-light); line-height: 1.9; }
.service-detail-media { background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%); border-radius: var(--radius); min-height: 220px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.service-detail-media img { transform: scale(1.07); }
.section-alt { background: var(--bg-gray); }
.center-cta { text-align: center; margin-top: 48px; }

/* Cases / feature grid */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

/* News */
.news-list { max-width: 860px; margin: 0 auto; }
.news-item { display: flex; gap: 24px; align-items: flex-start; padding: 26px 0; border-bottom: 1px solid var(--border); }
.news-date { flex-shrink: 0; width: 92px; text-align: center; background: #EEF2FF; color: var(--primary); border-radius: 10px; padding: 10px 0; font-weight: 700; line-height: 1.3; }
.news-date .d { display: block; font-size: 1.5rem; }
.news-date .ym { display: block; font-size: 0.75rem; font-weight: 500; opacity: 0.85; }
.news-body h3 { font-size: 1.15rem; color: var(--text); margin-bottom: 8px; }
.news-body p { font-size: 0.95rem; color: var(--text-light); line-height: 1.75; }

/* Contact form */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: start; }
.info-panel { display: flex; flex-direction: column; gap: 16px; }
.contact-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 0.9rem; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-row input, .form-row textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.95rem; font-family: inherit; color: var(--text); background: #fff; transition: var(--transition); }
.form-row input:focus, .form-row textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12); }
.form-note { font-size: 0.8rem; color: var(--text-light); line-height: 1.7; margin: 4px 0 18px; }

/* Footer sitemap */
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; text-align: left; padding-bottom: 36px; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.footer-sitemap { display: flex; gap: 56px; flex-wrap: wrap; }
.sitemap-col { display: flex; flex-direction: column; gap: 10px; }
.sitemap-title { color: #fff; font-weight: 600; font-size: 0.95rem; margin-bottom: 4px; }
.sitemap-col a { color: rgba(255, 255, 255, 0.55); font-size: 0.9rem; transition: var(--transition); }
.sitemap-col a:hover { color: #fff; }
.footer-brand { max-width: 300px; }
.footer-brand .logo-text { color: #fff; }
.footer-brand p { color: rgba(255, 255, 255, 0.55); font-size: 0.9rem; line-height: 1.8; margin-top: 12px; }
.footer-bottom { padding-top: 24px; display: flex; flex-direction: column; gap: 10px; align-items: center; }
.footer-legal { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center; }
.footer-legal a { color: rgba(255, 255, 255, 0.55); font-size: 0.85rem; transition: var(--transition); }
.footer-legal a:hover { color: #fff; }

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

    .brand-wall {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header .container {
        height: 60px;
    }

    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        padding: 100px 24px 60px;
        gap: 32px;
    }

    .hero-text {
        flex: none;
        width: 100%;
    }

    .hero-desc {
        margin: 0 auto 40px;
    }

    .hero-media {
        flex: none;
        width: 100%;
        max-width: 400px;
    }

    .section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .brand-wall {
        grid-template-columns: repeat(3, 1fr);
    }

    .service-card {
        padding: 32px 24px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

    .hero-btns {
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .brand-wall {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .contact-item {
        padding: 20px;
    }

    .footer-info,
    .footer-contact {
        flex-direction: column;
        gap: 8px;
    }

    .footer-divider {
        display: none;
    }
}

@media (max-width: 1024px) {
    .service-detail { gap: 28px; }
    .footer-sitemap { gap: 40px; }
}

@media (max-width: 768px) {
    .page-hero { padding: 118px 0 44px; }
    .feature-grid { grid-template-columns: 1fr; }
    .info-list { grid-template-columns: 1fr; }
    .service-detail { grid-template-columns: 1fr; }
    .service-detail:nth-child(even) .service-detail-media { order: 0; }
    .service-detail-media { min-height: 160px; }
    .about-intro-grid { grid-template-columns: 1fr; gap: 32px; }
    .contact-grid { grid-template-columns: 1fr; }
    .news-item { flex-direction: column; gap: 12px; }
    .news-date { width: 100%; padding: 8px 0; display: flex; gap: 6px; justify-content: center; align-items: baseline; }
    .news-date .d { font-size: 1.1rem; }
    .footer-top { flex-direction: column; }
    .footer-brand { max-width: 100%; }
    .footer-sitemap { gap: 32px; }
}