/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter", "思源黑体", "Microsoft YaHei", sans-serif;
}

:root {
    --brand-yellow: #FFC107;
    --brand-yellow-dark: #FFA000;
    --deep-blue: #0F172A;
    --soft-pink: #F87171;
    --gray-light: #F1F5F9;
    --gray-mid: #94A3B8;
    --gray-dark: #334155;
    --white: #FFFFFF;
    --smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--deep-blue);
    color: var(--white);
    overflow-x: hidden;
}

/* 导航栏 - 电脑端超精致 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 999;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 1.2rem 0;
    transition: all 0.3s var(--smooth);
}

.navbar.scrolled {
    padding: 0.7rem 0;
    background: rgba(15, 23, 42, 0.95);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 800;
    font-size: 1.7rem;
    color: var(--brand-yellow);
    text-decoration: none;
}

.navbar-brand img {
    height: 44px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.4rem;
    list-style: none;
}

.nav-link {
    color: var(--gray-mid);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s var(--smooth);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--white);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--brand-yellow);
    transition: width 0.3s var(--smooth);
}

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

.menu-toggle {
    display: none;
    font-size: 1.6rem;
    color: var(--brand-yellow);
    background: transparent;
    border: none;
    cursor: pointer;
}

/* 按钮 - 电脑端质感极强 */
.btn-primary {
    background: linear-gradient(135deg, var(--brand-yellow), var(--brand-yellow-dark));
    color: var(--deep-blue);
    font-weight: 700;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s var(--smooth);
    box-shadow: 0 4px 20px rgba(255, 193, 7, 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 193, 7, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    font-weight: 700;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    border: 2px solid rgba(255,255,255,0.3);
    cursor: pointer;
    transition: all 0.3s var(--smooth);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--white);
    transform: translateY(-3px);
}

/* 横幅 - 电脑端全屏高级感 */
.banner-section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 100px;
    overflow: hidden;
}

.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.banner-fluid {
    position: absolute;
    width: 900px;
    height: 900px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,193,7,0.18) 0%, transparent 70%);
    top: -300px;
    right: -250px;
    animation: float 12s infinite ease-in-out;
}

.banner-fluid:nth-child(2) {
    top: 40%;
    left: -350px;
    animation: float 14s infinite ease-in-out reverse;
}

@keyframes float {
    0%,100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-40px) rotate(8deg); }
}

.banner-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 2rem;
}

.banner-title {
    font-size: clamp(3rem, 6vw, 5.2rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--white) 0%, var(--brand-yellow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.banner-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--gray-mid);
    margin-bottom: 3.5rem;
    line-height: 1.7;
}

.banner-btns {
    display: flex;
    gap: 1.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 通用区块 */
.section {
    padding: 110px 0;
    position: relative;
}

.section-title {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--white) 0%, var(--brand-yellow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--gray-mid);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4.5rem;
}

/* 服务卡片 - 电脑端真正3D悬浮 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.8rem;
}

.service-card {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 24px;
    padding: 2.8rem 2.4rem;
    transition: all 0.5s var(--smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,193,7,0.15), rgba(248,113,113,0.1));
    opacity: 0;
    transition: opacity 0.5s var(--smooth);
}

.service-card:hover::before {
    opacity: 1;
}

.service-card:hover {
    transform: translateY(-18px) scale(1.02);
    border-color: rgba(255,193,7,0.4);
    box-shadow: 0 25px 50px rgba(255,193,7,0.18);
}

.service-card * {
    position: relative;
    z-index: 1;
}

.service-icon {
    width: 68px;
    height: 68px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--brand-yellow), var(--brand-yellow-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.8rem;
}

.service-title {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--white);
}

.service-desc {
    color: var(--gray-mid);
    line-height: 1.7;
    font-size: 1.05rem;
    margin-bottom: 2rem;
}

/* 承诺板块 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.advantage-item {
    background: rgba(255,255,255,0.04);
    border-radius: 20px;
    padding: 2.2rem;
    border-left: 4px solid var(--brand-yellow);
    transition: all 0.3s var(--smooth);
}

.advantage-item:hover {
    background: rgba(255,193,7,0.08);
    transform: translateX(8px);
}

.advantage-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--brand-yellow);
}

.advantage-desc {
    color: var(--gray-mid);
    line-height: 1.7;
}

/* 页脚 */
footer {
    background: rgba(0,0,0,0.3);
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 4rem 0 2.5rem;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    font-weight: 800;
    font-size: 2rem;
    color: var(--brand-yellow);
    text-decoration: none;
    margin-bottom: 2rem;
}

.footer-logo img {
    height: 50px;
    width: auto;
}

.footer-nav {
    display: flex;
    gap: 2.2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.8rem;
}

.footer-nav a {
    color: var(--gray-mid);
    text-decoration: none;
    transition: color 0.3s var(--smooth);
    font-size: 1rem;
}

.footer-nav a:hover {
    color: var(--brand-yellow);
}

.footer-copyright {
    color: var(--gray-mid);
    margin-top: 2rem;
    font-size: 0.95rem;
}

/* ====================== 响应式 ====================== */
@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(15,23,42,0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 3rem 2rem;
        gap: 2rem;
        transition: left 0.3s var(--smooth);
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: block;
    }

    .services-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .banner-btns {
        flex-direction: column;
        width: 100%;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
    }
}