/* ===== 全局样式 ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --pink: #ec4899;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray: #64748b;
    --light: #f8fafc;
    --border: #e2e8f0;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-2: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,.1);
    --shadow: 0 4px 20px rgba(0,0,0,.08);
    --shadow-lg: 0 10px 40px rgba(99,102,241,.15);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all .3s cubic-bezier(.4,0,.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--dark-2);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--white);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(99,102,241,.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,.5);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }
.btn-block { width: 100%; }

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.header.scrolled {
    background: rgba(255,255,255,.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
}
.logo-img {
    height: 44px;
    width: auto;
    display: block;
}
.footer-brand .logo-img {
    height: 60px;
}
.nav {
    display: flex;
    gap: 4px;
}
.nav-link {
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    color: var(--dark-2);
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(99,102,241,.08);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 120px 0 80px;
    background: linear-gradient(180deg, #f0f4ff 0%, #faf5ff 50%, #fff 100%);
    overflow: hidden;
    display: flex;
    align-items: center;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,.05) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.hero-particles { position: absolute; inset: 0; }
.particle {
    position: absolute;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--primary);
    opacity: .3;
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); opacity: .3; }
    50% { transform: translateY(-30px); opacity: .6; }
}
.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(99,102,241,.1);
    border: 1px solid rgba(99,102,241,.2);
    border-radius: 50px;
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 28px;
}
.badge-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--primary);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: .5; transform: scale(1.3); }
}
.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    color: var(--dark);
    letter-spacing: -1px;
}
.hero-desc {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 36px;
    max-width: 540px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
    flex-wrap: wrap;
}
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 560px;
}
.hero-stat {
    text-align: left;
}
.stat-num {
    font-size: 32px;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}
.stat-num::after { content: "+"; }
.stat-label {
    font-size: 13px;
    color: var(--gray);
    margin-top: 6px;
}
.hero-visual { position: relative; }
.hero-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.8);
}
.card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 18px;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
}
.card-dot { width: 10px; height: 10px; border-radius: 50%; }
.card-dot.red { background: #ef4444; }
.card-dot.yellow { background: #f59e0b; }
.card-dot.green { background: #10b981; }
.card-title { margin-left: 8px; font-size: 13px; color: var(--gray); font-weight: 500; }
.card-body { padding: 20px; }
.data-flow { display: flex; flex-direction: column; gap: 14px; margin-bottom: 20px; }
.data-line {
    position: relative;
    height: 8px;
    background: #f1f5f9;
    border-radius: 4px;
    overflow: hidden;
}
.data-line::before {
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0;
    background: var(--gradient-2);
    border-radius: 4px;
    width: 0;
    animation: fillBar 1.5s ease forwards;
}
.data-line:nth-child(1)::before { animation-delay: .1s; }
.data-line:nth-child(2)::before { animation-delay: .3s; }
.data-line:nth-child(3)::before { animation-delay: .5s; }
.data-line:nth-child(4)::before { animation-delay: .7s; }
@keyframes fillBar { to { width: var(--w, 100%); } }
.data-line span {
    position: absolute;
    top: -18px; left: 0;
    font-size: 12px;
    color: var(--gray);
    font-weight: 500;
}
.data-line em {
    position: absolute;
    top: -18px; right: 0;
    font-style: normal;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
}
.data-line { --w: attr(style); }
.data-line { width: 100% !important; height: 8px; }
.data-line::before { width: var(--w, 100%) !important; animation: none; }

.card-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 80px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}
.bar {
    flex: 1;
    background: var(--gradient-2);
    border-radius: 4px 4px 0 0;
    opacity: .7;
    animation: barGrow 1s ease forwards;
    transform-origin: bottom;
    transform: scaleY(0);
}
.bar:nth-child(1) { animation-delay: .1s; }
.bar:nth-child(2) { animation-delay: .2s; }
.bar:nth-child(3) { animation-delay: .3s; }
.bar:nth-child(4) { animation-delay: .4s; }
.bar:nth-child(5) { animation-delay: .5s; }
.bar:nth-child(6) { animation-delay: .6s; }
.bar:nth-child(7) { animation-delay: .7s; }
@keyframes barGrow { to { transform: scaleY(1); } }

.card-2 {
    position: absolute;
    bottom: -30px;
    left: -30px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.globe-icon {
    width: 56px; height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ede9fe, #cffafe);
    border-radius: 12px;
}
.card-2-text { display: flex; flex-direction: column; }
.card-2-text strong { font-size: 15px; color: var(--dark); }
.card-2-text span { font-size: 12px; color: var(--gray); }

.floating { animation: floating 4s ease-in-out infinite; }
.floating-delay { animation: floating 4s ease-in-out infinite .5s; }
@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 26px;
    height: 42px;
    border: 2px solid var(--gray);
    border-radius: 14px;
    opacity: .5;
}
.scroll-indicator span {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--gray);
    border-radius: 2px;
    animation: scrollDown 1.5s infinite;
}
@keyframes scrollDown {
    0% { opacity: 1; transform: translate(-50%, 0); }
    100% { opacity: 0; transform: translate(-50%, 14px); }
}

/* ===== 合作伙伴 ===== */
.partners {
    padding: 50px 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
}
.partners-label {
    text-align: center;
    color: var(--gray);
    font-size: 14px;
    margin-bottom: 30px;
}
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    align-items: center;
}
.partner-item {
    text-align: center;
    font-size: 18px;
    font-weight: 700;
    color: #cbd5e1;
    transition: var(--transition);
    filter: grayscale(1);
}
.partner-item:hover {
    color: var(--primary);
    filter: grayscale(0);
    transform: scale(1.05);
}

/* ===== 通用Section ===== */
.section { padding: 100px 0; }
.section-dark {
    background: var(--dark);
    color: #e2e8f0;
}
.section-dark .section-title { color: #fff; }
.section-dark .section-desc { color: #94a3b8; }

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}
.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99,102,241,.1);
    color: var(--primary);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}
.section-dark .section-tag { background: rgba(99,102,241,.2); }
.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 18px;
    color: var(--dark);
    letter-spacing: -.5px;
}
.section-desc {
    font-size: 17px;
    color: var(--gray);
}

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 60px;
    align-items: center;
}
.about-content h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--dark);
}
.about-content p {
    color: var(--gray);
    margin-bottom: 18px;
    font-size: 16px;
}
.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 32px;
}
.about-feature {
    padding: 20px;
    background: var(--light);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.about-feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: transparent;
}
.feature-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    color: #fff;
}
.icon-blue { background: linear-gradient(135deg, #3b82f6, #6366f1); }
.icon-purple { background: linear-gradient(135deg, #8b5cf6, #a855f7); }
.icon-cyan { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.icon-pink { background: linear-gradient(135deg, #ec4899, #f43f5e); }
.about-feature h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--dark);
}
.about-feature p {
    font-size: 13px;
    color: var(--gray);
    margin: 0;
}
.about-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}
.about-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    background: var(--light);
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
}
.status-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 0 4px rgba(16,185,129,.2);
    animation: pulse 2s infinite;
}
.about-card-body { padding: 24px; }
.metric-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}
.metric {
    padding: 16px;
    background: var(--light);
    border-radius: var(--radius);
    text-align: center;
}
.metric-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
}
.metric-label {
    font-size: 12px;
    color: var(--gray);
    margin-top: 4px;
}
.mini-chart {
    background: var(--light);
    border-radius: var(--radius);
    padding: 12px;
}

/* ===== 产品服务 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    padding: 32px;
    background: rgba(255,255,255,.03);
    border: 1px solid rgba(255,255,255,.08);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.service-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient);
    transform: scaleX(0);
    transition: var(--transition);
}
.service-card:hover {
    transform: translateY(-8px);
    background: rgba(255,255,255,.06);
    border-color: rgba(99,102,241,.3);
}
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
    width: 60px; height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: #fff;
}
.icon-cloud { background: linear-gradient(135deg, #3b82f6, #6366f1); }
.icon-data { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.icon-ai { background: linear-gradient(135deg, #8b5cf6, #a855f7); }
.icon-security { background: linear-gradient(135deg, #10b981, #059669); }
.icon-dev { background: linear-gradient(135deg, #f59e0b, #d97706); }
.icon-iot { background: linear-gradient(135deg, #ec4899, #db2777); }
.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #fff;
}
.service-card > p {
    color: #94a3b8;
    margin-bottom: 18px;
    font-size: 14px;
}
.service-list {
    margin-bottom: 20px;
}
.service-list li {
    padding: 6px 0;
    color: #cbd5e1;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.service-list li::before {
    content: "✓";
    color: var(--accent);
    font-weight: 700;
}
.service-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}
.service-link:hover { color: var(--accent); }

/* ===== 解决方案 ===== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.solution-card {
    padding: 40px;
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    min-height: 220px;
}
.solution-card:hover { transform: translateY(-6px); }
.solution-1 { background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%); }
.solution-2 { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); }
.solution-3 { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); }
.solution-4 { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.solution-content { flex: 1; }
.solution-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255,255,255,.6);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}
.solution-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}
.solution-card p {
    color: var(--dark-2);
    font-size: 14px;
    opacity: .8;
    margin-bottom: 16px;
}
.solution-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
}
.solution-icon {
    opacity: .5;
    color: var(--dark);
    flex-shrink: 0;
}

/* ===== 新闻动态 ===== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.news-card {
    background: rgba(255,255,255,.03);
    border: 1px solid rgba(255,255,255,.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}
.news-card:hover {
    transform: translateY(-6px);
    border-color: rgba(99,102,241,.3);
}
.news-image {
    height: 180px;
    position: relative;
    overflow: hidden;
}
.news-img-1 { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.news-img-2 { background: linear-gradient(135deg, #06b6d4, #3b82f6); }
.news-img-3 { background: linear-gradient(135deg, #ec4899, #f59e0b); }
.news-image::after {
    content: "";
    position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,.2), transparent 60%);
}
.news-category {
    position: absolute;
    top: 16px; left: 16px;
    padding: 4px 12px;
    background: rgba(255,255,255,.9);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--dark);
    z-index: 1;
}
.news-body { padding: 24px; }
.news-date {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 10px;
}
.news-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
    line-height: 1.5;
}
.news-body > p {
    color: #94a3b8;
    font-size: 14px;
    margin-bottom: 16px;
}
.news-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 50px;
    align-items: start;
}
.contact-info h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--dark);
}
.contact-intro {
    color: var(--gray);
    margin-bottom: 30px;
}
.contact-list { display: flex; flex-direction: column; gap: 20px; margin-bottom: 30px; }
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}
.contact-item-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    background: rgba(99,102,241,.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.contact-item-label {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 2px;
}
.contact-item-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--dark);
}
.contact-qr {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--light);
    border-radius: var(--radius);
}
.qr-placeholder {
    width: 70px; height: 70px;
    background: #fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    border: 1px solid var(--border);
}
.contact-qr strong { display: block; color: var(--dark); font-size: 15px; }
.contact-qr span { font-size: 13px; color: var(--gray); }

.contact-form-wrap {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}
.contact-form h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--dark);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}
.form-group label span { color: #ef4444; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background: #fff;
    color: var(--dark);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-tip {
    text-align: center;
    font-size: 12px;
    color: var(--gray);
    margin-top: 14px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    color: #94a3b8;
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}
.footer-social { display: flex; gap: 12px; }
.footer-social a {
    width: 38px; height: 38px;
    border-radius: 10px;
    background: rgba(255,255,255,.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    transition: var(--transition);
}
.footer-social a:hover {
    background: var(--gradient);
    color: #fff;
    transform: translateY(-3px);
}
.footer-col h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 20px;
}
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
    color: #94a3b8;
    font-size: 14px;
    transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px; height: 48px;
    border-radius: 50%;
    background: var(--gradient);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover { transform: translateY(-4px); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-content { grid-template-columns: 1fr; gap: 50px; }
    .hero-visual { max-width: 480px; margin: 0 auto; }
    .about-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav { display: none; }
    .menu-toggle { display: flex; }
    .nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px; left: 0; right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: var(--shadow);
        border-top: 1px solid var(--border);
    }
    .hero { padding: 100px 0 60px; }
    .hero-title { font-size: 38px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 70px 0; }
    .section-title { font-size: 32px; }
    .services-grid { grid-template-columns: 1fr; }
    .solutions-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .about-features { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .contact-form-wrap { padding: 24px; }
    .card-2 { left: 0; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 30px; }
    .section-title { font-size: 26px; }
    .partners-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .stat-num { font-size: 26px; }
}

/* ===== 动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .8s ease, transform .8s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}