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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --text: #1e293b;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --bg-section: #f1f5f9;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: .3s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

ul { list-style: none; }

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

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    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 4px 12px rgba(37,99,235,.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,.6);
}

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

.btn-block { width: 100%; }

/* ========== Navbar ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition);
    padding: 0;
}

.navbar.scrolled {
    background: rgba(255,255,255,.95);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    transition: color var(--transition);
}

.navbar.scrolled .logo { color: var(--primary); }

.logo-icon { font-size: 28px; }

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,.85);
    position: relative;
    padding: 4px 0;
}

.navbar.scrolled .nav-links a {
    color: var(--text-light);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover,
.navbar.scrolled .nav-links a:hover {
    color: var(--primary);
}

.navbar.scrolled .nav-links a.active {
    color: var(--primary);
}

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all var(--transition);
}

.navbar.scrolled .nav-toggle span {
    background: var(--text);
}

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

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

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

/* ========== Hero ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #0ea5e9 100%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(6,182,212,.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(99,102,241,.3) 0%, transparent 50%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 0 24px;
}

.hero-title {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp .8s ease forwards;
}

.hero-subtitle {
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 400;
    opacity: .9;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp .8s ease .2s forwards;
}

.hero-desc {
    font-size: 16px;
    line-height: 1.8;
    opacity: .8;
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp .8s ease .4s forwards;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp .8s ease .6s forwards;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255,255,255,.6);
    border-bottom: 2px solid rgba(255,255,255,.6);
    transform: rotate(45deg);
    animation: scrollDown 1.5s ease infinite;
}

@keyframes scrollDown {
    0% { opacity: 0; transform: rotate(45deg) translate(-4px, -4px); }
    50% { opacity: 1; }
    100% { opacity: 0; transform: rotate(45deg) translate(4px, 4px); }
}

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

.section:nth-child(even) {
    background: var(--bg-section);
}

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

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin: 0 auto;
    border-radius: 2px;
}

/* ========== About ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 16px;
}

.about-text p:last-child { margin-bottom: 0; }

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition);
}

.stat-item:hover {
    transform: translateY(-4px);
}

.stat-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary);
    display: inline;
}

.stat-suffix {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    display: block;
    margin-top: 8px;
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

/* ========== Services ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid var(--border);
}

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

.service-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.service-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ========== Advantages ========== */
.advantages-list {
    display: grid;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 32px;
    padding: 36px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.advantage-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.adv-number {
    font-size: 48px;
    font-weight: 900;
    color: var(--primary);
    opacity: .15;
    line-height: 1;
    min-width: 70px;
    transition: opacity var(--transition);
}

.advantage-item:hover .adv-number {
    opacity: .3;
}

.adv-content h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.adv-content p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ========== Process ========== */
.process-steps {
    display: flex;
    gap: 20px;
    position: relative;
    justify-content: center;
}

.process-step {
    flex: 1;
    text-align: center;
    padding: 40px 20px 36px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
    transition: all var(--transition);
    max-width: 210px;
}

.process-step:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.step-number {
    font-size: 14px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 12px;
    opacity: .5;
}

.step-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.process-step h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}

.process-step p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.8;
}

/* 步骤间连接线 */
.process-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -12px;
    width: 24px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: .3;
}

.process-step:last-child::after {
    display: none;
}

/* ========== Contact ========== */
.contact-intro {
    text-align: center;
    margin-bottom: 48px;
}

.contact-intro p {
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.9;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 960px;
    margin: 0 auto;
}

.contact-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

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

.contact-card-icon {
    font-size: 36px;
    display: block;
    margin-bottom: 20px;
}

.contact-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-light);
}

/* ========== Footer ========== */
.footer {
    background: #0f172a;
    color: rgba(255,255,255,.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-brand .logo {
    margin-bottom: 16px;
    color: #fff;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links li,
.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,.5);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
}

.footer-bottom p + p {
    margin-top: 6px;
}

.icp-info a {
    color: rgba(255,255,255,.4);
    transition: color var(--transition);
}

.icp-info a:hover {
    color: var(--accent);
}

.icp-divider {
    margin: 0 8px;
    color: rgba(255,255,255,.3);
}

.police-filing {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.police-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* ========== Animate on Scroll ========== */
[data-aos] {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity .6s ease, transform .6s ease;
}

[data-aos="fade-right"] {
    transform: translateX(-40px);
}

[data-aos="fade-left"] {
    transform: translateX(40px);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translate(0);
}

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

    .process-steps {
        flex-wrap: wrap;
    }

    .process-step {
        max-width: 280px;
    }

    .process-step:not(:last-child)::after {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        transition: transform var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-links li {
        border-bottom: 1px solid var(--border);
    }

    .nav-links a {
        display: block;
        padding: 14px 0;
        color: var(--text);
        font-size: 16px;
    }

    .nav-links a::after {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .process-steps {
        flex-direction: column;
        align-items: center;
    }

    .process-step {
        max-width: 100%;
    }

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

    .advantage-item {
        flex-direction: column;
        gap: 16px;
    }

    .adv-number {
        font-size: 36px;
        min-width: auto;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .section {
        padding: 70px 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

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

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .stat-number {
        font-size: 32px;
    }

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