/* ===== 基础变量与重置 ===== */
:root {
    --color-bg: #ffffff;
    --color-bg-light: #f8f9fb;
    --color-bg-dark: #18181b;
    --color-text: #18181b;
    --color-text-secondary: #71717a;
    --color-text-light: #a1a1aa;
    --color-border: #e4e4e7;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #eff6ff;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --max-width: 1152px;
    --nav-height: 72px;
    --radius: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.08);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: #fbfcfd;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

.section-padding { padding: 120px 0; }
.bg-light { background: var(--color-bg-light); }
.bg-dark { background: var(--color-bg-dark); color: #fff; }

/* ===== 区域背景装饰 ===== */
.about {
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37,99,235,0.03) 0%, transparent 70%);
    pointer-events: none;
}

.about::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14,165,233,0.03) 0%, transparent 70%);
    pointer-events: none;
}

.products {
    position: relative;
    overflow: hidden;
}

.products::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(37,99,235,0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(99,102,241,0.02) 0%, transparent 50%);
    pointer-events: none;
}

.products::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 50% 50%, rgba(37,99,235,0.015) 1px, transparent 1px);
    background-size: 30px 30px;
    mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 30%, transparent 70%);
    pointer-events: none;
}

.advantages {
    position: relative;
    overflow: hidden;
}

.advantages::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px solid rgba(37,99,235,0.04);
    pointer-events: none;
}

.advantages::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 500px;
    height: 500px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px solid rgba(37,99,235,0.03);
    pointer-events: none;
}

.contact {
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: linear-gradient(to bottom, transparent, black 20%, black 80%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, transparent, black 20%, black 80%, transparent);
    pointer-events: none;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--color-text);
}

.logo img { height: 36px; width: auto; vertical-align: middle; }

.nav-links {
    display: flex;
    gap: 6px;
    flex-shrink: 0;   /* 不被两侧内容挤压，配合 nowrap 保证菜单单行 */
}

.nav-link {
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    white-space: nowrap;   /* 菜单文字始终单行，不折行 */
    transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    background: var(--color-bg-light);
}

/* 导航栏联系方式 */
.nav-contact {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
    flex-shrink: 0;
}

.nav-contact svg {
    flex-shrink: 0;
    color: var(--color-primary);
}

.nav-contact small {
    font-size: 11px;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.nav-contact-divider {
    color: var(--color-border);
    font-size: 14px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 120px 0 80px;
    background: linear-gradient(180deg, #f0f4ff 0%, #f8fafc 40%, #f0f5ff 100%);
}

.hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background:
        /* 顶部大面积蓝色光晕 */
        radial-gradient(ellipse 80% 50% at 20% -10%, rgba(37,99,235,0.08), transparent 60%),
        /* 右上角暖色光晕 */
        radial-gradient(ellipse 40% 35% at 90% 10%, rgba(99,102,241,0.06), transparent 55%),
        /* 中间偏右的青色光晕 */
        radial-gradient(ellipse 50% 45% at 75% 55%, rgba(14,165,233,0.05), transparent 55%),
        /* 底部大面积渐变 */
        radial-gradient(ellipse 60% 30% at 30% 100%, rgba(37,99,235,0.04), transparent 60%),
        /* 左下角深蓝色点缀 */
        radial-gradient(circle 300px at 15% 80%, rgba(29,78,216,0.05), transparent);
}

/* 网格线背景层 */
.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
}

/* 浮动光点 */
.hero-bg::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37,99,235,0.06) 0%, transparent 70%);
    top: 50%;
    left: 60%;
    transform: translate(-50%, -50%);
    animation: floatOrb 8s ease-in-out infinite;
}

@keyframes floatOrb {
    0%, 100% { transform: translate(-50%, -50%) translate(0, 0) scale(1); }
    33% { transform: translate(-50%, -50%) translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-50%, -50%) translate(-20px, 20px) scale(0.9); }
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: clamp(42px, 7vw, 72px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 540px;
    margin-bottom: 40px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: -0.2px;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(37,99,235,0.35);
}

.btn-outline {
    background: #fff;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
    border-color: #d4d4d8;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* ===== 通用区域标题 ===== */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 6px 14px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.section-tag-light {
    background: rgba(255,255,255,0.1);
    color: #93c5fd;
}

.section-header h2 {
    font-size: clamp(30px, 4vw, 42px);
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-header p {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.bg-dark .section-header h2 { color: #fff; }
.bg-dark .section-header p { color: var(--color-text-light); }

/* ===== 关于我们 - 数据统计 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    letter-spacing: -1.5px;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 15px;
    color: var(--color-text-secondary);
}

/* ===== 产品卡片 ===== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 24px;
}

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    margin-bottom: 24px;
}

.card h3 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 12px;
}

.card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== 核心优势 ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px 64px;
}

.advantage-item {
    position: relative;
    padding: 24px 0;
    border-bottom: 1px solid var(--color-border);
}

.advantage-number {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.advantage-item h3 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 8px;
}

.advantage-item p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== 联系方式 ===== */
.contact-info {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 15px;
    color: var(--color-text-light);
}

.contact-item svg { flex-shrink: 0; color: #93c5fd; }

.contact-qrcodes {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 48px;
    flex-wrap: wrap;
}

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

.contact-qrcode img {
    width: 140px;
    height: 140px;
    object-fit: contain;
    border-radius: 8px;
    border: 2px solid rgba(255,255,255,0.12);
    background: #fff;
    padding: 4px;
}

.contact-qrcode span {
    font-size: 13px;
    color: var(--color-text-light);
}

/* ===== 页脚 ===== */
.footer {
    background: #0a0a0b;
    color: var(--color-text-light);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand .logo { color: #fff; }
.footer-brand p {
    margin-top: 12px;
    font-size: 14px;
    max-width: 260px;
}

.footer-links h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links ul { display: flex; flex-direction: column; gap: 10px; }

.footer-links a {
    font-size: 14px;
    transition: color var(--transition);
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 13px;
    text-align: center;
}

/* ===== 淡入动画 ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

.fade-up.delay-1 { transition-delay: 0.15s; }
.fade-up.delay-2 { transition-delay: 0.3s; }

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

/* 导航栏空间有限时，优先隐藏右侧联系方式，保证菜单单行不折行 */
@media (max-width: 1152px) {
    .nav-contact { display: none; }
}

@media (max-width: 768px) {
    .section-padding { padding: 80px 0; }
    .container { padding: 0 20px; }

    /* 移动端导航 */
    .nav-links {
        position: fixed;
        inset: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        gap: 4px;
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--transition);
    }

    .nav-links.open {
        opacity: 1;
        pointer-events: auto;
    }

    .nav-link { font-size: 20px; padding: 14px 24px; }

    .nav-contact { display: none; }

    .menu-toggle { display: flex; }

    /* 间距调整 */
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .cards-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; gap: 8px; }
    .footer-grid { grid-template-columns: 1fr; gap: 40px; }

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

@media (max-width: 480px) {
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; text-align: center; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}