:root {
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --secondary: #7c3aed;
    --accent: #f97316;
    --text: #0f172a;
    --text-mid: #475569;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --glow: 0 4px 20px rgba(37, 99, 235, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 顶部导航 */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 44px;
    width: auto;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-mid);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s;
}

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

.contact-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white !important;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: var(--glow);
    transition: all 0.3s;
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(37, 99, 235, 0.3);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 7rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: -40%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.12) 0%, rgba(124, 58, 237, 0.08) 40%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border: 1px solid rgba(37, 99, 235, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    width: fit-content;
    font-weight: 500;
}

.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.hero-text h1 span {
    display: block;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--text-mid);
    margin-bottom: 2rem;
    max-width: 520px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero-tag {
    background: var(--bg-card);
    padding: 0.6rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    color: var(--text);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.hero-tag:hover {
    border-color: var(--primary);
    box-shadow: var(--glow);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img {
    width: 100%;
    max-width: 720px;
    border-radius: 20px;
    box-shadow: 0 30px 80px rgba(15, 23, 42, 0.35);
}

/* 通用 section */
section {
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin: 4rem auto 2.5rem;
    max-width: 640px;
    padding: 0 1rem;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.section-header p {
    color: var(--text-mid);
    font-size: 1rem;
}

/* 服务 */
.services {
    padding: 2rem 2rem 4rem;
}

.services-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service-card {
    background: var(--bg-card);
    border-radius: 18px;
    border: 1px solid var(--border);
    padding: 1.8rem 1.6rem;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    border-color: rgba(37, 99, 235, 0.35);
}

.service-card .icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 1.1rem;
}

.service-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
}

.service-card p {
    font-size: 0.95rem;
    color: var(--text-mid);
}

/* 行业解决方案 */
.solutions {
    padding: 2rem 2rem 4rem;
}

.solution-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.solution-card {
    background: var(--bg-card);
    border-radius: 18px;
    border: 1px solid var(--border);
    padding: 1.8rem 1.6rem;
    transition: all 0.3s;
}

.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--glow);
    border-color: rgba(37, 99, 235, 0.35);
}

.solution-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 1rem;
}

.solution-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
}

.solution-card p {
    font-size: 0.95rem;
    color: var(--text-mid);
}

/* 为什么选择我们 + 信任背书 */
.why-us {
    padding: 3rem 2rem 4rem;
}

.why-us-content {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.why-us .text h2 {
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.why-us .text p {
    color: var(--text-mid);
    margin-bottom: 1.5rem;
}

.advantage-list {
    list-style: none;
    padding-left: 0;
}

.advantage-list li {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--text);
}

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

.stat-item {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    padding: 1.4rem 1rem;
    text-align: center;
    transition: all 0.3s;
}

.stat-item:hover {
    box-shadow: var(--glow);
    border-color: rgba(37, 99, 235, 0.3);
    transform: translateY(-4px);
}

.stat-item .num {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-item .label {
    margin-top: 0.4rem;
    font-size: 0.9rem;
    color: var(--text-mid);
}

/* 联系我们 */
.contact {
    padding: 4rem 2rem 4rem;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact h2 {
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.contact p {
    color: var(--text-mid);
    margin-bottom: 2.5rem;
}

.contact-methods {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.7rem;
}

.icon-box {
    width: 72px;
    height: 72px;
    background: var(--bg);
    border-radius: 18px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: all 0.3s;
}

.contact-item:hover .icon-box {
    border-color: var(--primary);
    box-shadow: var(--glow);
    transform: translateY(-4px);
}

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

.contact-item .value {
    font-size: 1.1rem;
    font-weight: 600;
}

/* 页脚 */
.site-footer {
    background: var(--text);
    color: var(--text-light);
    padding: 2rem;
    text-align: center;
}

.footer-logo img {
    height: 32px;
    width: auto;
    margin-bottom: 0.8rem;
}

.site-footer p {
    font-size: 0.9rem;
}

.footer-sub {
    margin-top: 0.4rem;
    font-size: 0.85rem;
}

/* 响应式 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text p {
        margin: 0 auto 2rem;
    }

    .hero-tags {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-img {
        max-width: 520px;
    }

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

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

    .why-us-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 640px) {
    .site-header {
        padding: 0.8rem 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 0.8rem;
    }

    nav ul {
        gap: 1rem;
        font-size: 0.85rem;
    }

    .hero {
        padding: 6rem 1.2rem 3rem;
    }

    .hero-text h1 {
        font-size: 2.1rem;
    }

    .hero-img {
        max-width: 420px;
    }

    .services-grid,
    .solution-grid {
        grid-template-columns: 1fr;
    }

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

    .contact-methods {
        gap: 2rem;
    }
}
#services,
#solutions,
#why-us,
#contact {
    scroll-margin-top: 90px;
}