/* ===== 基础变量 ===== */
:root {
    --blue-900: #0a1628;
    --blue-800: #0d1f3c;
    --blue-700: #122a52;
    --blue-600: #1a3a6e;
    --blue-500: #1e56a0;
    --blue-400: #2d7dd2;
    --blue-300: #4a9aea;
    --blue-200: #7bbcf5;
    --blue-100: #b8dcfc;
    --blue-50: #e8f4ff;
    --cyan-400: #00d4ff;
    --cyan-500: #00b8d9;
    --white: #ffffff;
    --gray-100: #f0f4f8;
    --gray-200: #d9e2ec;
    --gray-300: #b0bec5;
    --gray-400: #7b8794;
    --gray-500: #486581;
    --gray-600: #334e68;
    --gray-700: #243b53;
    --gray-800: #1a2a3a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.12);
    --shadow-md: 0 4px 14px rgba(0,0,0,.1);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.15);
    --shadow-glow: 0 0 30px rgba(45,125,210,.3);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: .3s cubic-bezier(.4,0,.2,1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--gray-700);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
}

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

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 22, 40, .92);
    backdrop-filter: blur(12px);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0,0,0,.2);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--white);
}

.brand-icon {
    font-size: 1.6rem;
    color: var(--cyan-400);
}

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

.nav-links a {
    color: rgba(255,255,255,.8);
    font-size: .95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--cyan-400);
    transition: var(--transition);
}

.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 50%, var(--blue-500) 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(45,125,210,.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(45,125,210,.06) 1px, transparent 1px);
    background-size: 60px 60px;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(0,212,255,.15);
    animation: float 8s ease-in-out infinite;
}

.particle-1 { width: 300px; height: 300px; top: -80px; right: -60px; animation-delay: 0s; }
.particle-2 { width: 200px; height: 200px; bottom: 10%; left: -40px; animation-delay: -3s; }
.particle-3 { width: 120px; height: 120px; top: 40%; right: 15%; animation-delay: -5s; }

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
}

.glow-1 { width: 400px; height: 400px; background: rgba(0,212,255,.1); top: -100px; right: -50px; }
.glow-2 { width: 300px; height: 300px; background: rgba(45,125,210,.15); bottom: -50px; left: -30px; }

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: .6; }
    50% { transform: translateY(-30px) scale(1.05); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: 100px 0 60px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    border: 1px solid rgba(0,212,255,.4);
    border-radius: 50px;
    font-size: .9rem;
    color: var(--cyan-400);
    background: rgba(0,212,255,.08);
    margin-bottom: 28px;
    letter-spacing: .5px;
}

.hero-title {
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.15;
}

.title-highlight {
    background: linear-gradient(135deg, var(--white) 0%, var(--cyan-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: rgba(255,255,255,.75);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue-400), var(--cyan-400));
    color: var(--white);
    border: none;
    box-shadow: 0 4px 20px rgba(0,212,255,.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(0,212,255,.45);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1.5px solid rgba(255,255,255,.35);
}

.btn-outline:hover {
    background: rgba(255,255,255,.1);
    border-color: rgba(255,255,255,.6);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--cyan-400);
    line-height: 1.2;
}

.stat-unit {
    font-size: .9rem;
    color: rgba(255,255,255,.6);
    margin-top: 4px;
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255,255,255,.4);
    font-size: .8rem;
    animation: fadeInUp 1s ease 1.5s both;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    margin: 8px auto 0;
    border-right: 2px solid rgba(255,255,255,.4);
    border-bottom: 2px solid rgba(255,255,255,.4);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); opacity: .4; }
    50% { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== 通用 Section ===== */
section { padding: 100px 0; }

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 50px;
    font-size: .85rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--blue-400);
    margin-bottom: 4px;
}

.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 业务领域 ===== */
.business {
    background: var(--gray-100);
}

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

.business-card {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px 36px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
    border: 1px solid transparent;
}

.business-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-200);
}

.business-card.featured {
    background: linear-gradient(160deg, var(--blue-900) 0%, var(--blue-700) 100%);
    color: var(--white);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.business-card.featured:hover {
    box-shadow: 0 0 50px rgba(45,125,210,.4);
}

.card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 14px;
    border-radius: 50px;
    font-size: .75rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--cyan-400), var(--blue-400));
    color: var(--white);
}

.card-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    color: var(--blue-400);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 82, 217, 0.1), rgba(61, 169, 255, 0.18));
    color: var(--primary);
}

.business-card.featured .card-icon {
    background: rgba(61, 169, 255, 0.18);
    color: #7DC8FF;
}

.business-card.featured .card-icon svg {
    color: #7DC8FF;
}

.card-icon svg {
    width: 40px;
    height: 40px;
    color: var(--blue-400);
}

.card-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--gray-800);
}

.business-card.featured .card-title {
    color: var(--white);
}

.card-desc {
    font-size: .95rem;
    line-height: 1.75;
    margin-bottom: 24px;
    color: var(--gray-500);
}

.business-card.featured .card-desc {
    color: rgba(255,255,255,.75);
}

.card-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card-features li {
    font-size: .9rem;
    padding-left: 20px;
    position: relative;
    color: var(--gray-600);
}

.business-card.featured .card-features li {
    color: rgba(255,255,255,.85);
}

.card-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue-300);
}

.business-card.featured .card-features li::before {
    background: var(--cyan-400);
}

.card-decoration {
    position: absolute;
    bottom: -40px;
    right: -40px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(45,125,210,.04);
    pointer-events: none;
}

.business-card.featured .card-decoration {
    background: rgba(0,212,255,.08);
}

/* ===== 关于我们 ===== */
.about {
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-lead {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 20px;
    line-height: 1.9;
}

.about-text p {
    font-size: 1rem;
    color: var(--gray-500);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-text p.about-slogan {
    font-size: 1.2rem;
    font-weight: 600;
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.value-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    padding: 20px;
    border-radius: var(--radius);
    background: var(--blue-50);
    transition: var(--transition);
}

.value-item:hover {
    background: var(--blue-100);
    transform: translateX(4px);
}

.value-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    color: var(--blue-400);
}

.value-icon svg {
    width: 100%;
    height: 100%;
}

.value-item h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.value-item p {
    font-size: .9rem;
    color: var(--gray-500);
}

.about-slogan {
    margin-top: 28px;
}

.slogan-text {
    position: relative;
    display: inline-block;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--blue-500);
    letter-spacing: 2px;
}

.slogan-text::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 6px;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--blue-200), var(--cyan-400), var(--blue-200));
    opacity: .45;
}

/* ===== 联系我们 ===== */
.contact {
    background: var(--gray-100);
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.contact-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--blue-200);
}

.contact-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 18px;
    color: var(--blue-400);
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

.contact-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: .95rem;
    color: var(--gray-500);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--blue-900);
    color: rgba(255,255,255,.6);
    padding: 20px 0;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand .brand-icon {
    color: var(--cyan-400);
}

.footer-filing p {
    font-size: .85rem;
    line-height: 1.8;
}

.footer-filing a {
    color: rgba(255,255,255,.6);
    transition: var(--transition);
}

.footer-filing a:hover {
    color: var(--cyan-400);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .business-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    .business-card { padding: 32px 24px 28px; }
    .about-content { gap: 40px; }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: var(--blue-900);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 24px;
        transition: var(--transition);
        box-shadow: -4px 0 20px rgba(0,0,0,.3);
    }

    .nav-links.active { right: 0; }

    .nav-links a {
        font-size: 1.1rem;
        color: rgba(255,255,255,.9);
    }

    .hero-stats { gap: 32px; }
    .stat-number { font-size: 2rem; }

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

    .business-card.featured {
        order: -1;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 36px;
    }

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

    section { padding: 72px 0; }
}

@media (max-width: 480px) {
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-stats { gap: 20px; flex-wrap: wrap; }
    .stat-number { font-size: 1.8rem; }
    .btn { padding: 12px 28px; font-size: .95rem; }
}

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .6s ease, transform .6s ease;
}

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