/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0e5f7a;
    --primary-dark: #0a4558;
    --primary-light: #1a8aab;
    --secondary-color: #2d6a4f;
    --accent-color: #c45c26;
    --text-primary: #1a242b;
    --text-secondary: #5a6670;
    --text-light: #8a949c;
    --bg-primary: #ffffff;
    --bg-secondary: #eef5f8;
    --bg-dark: #122029;
    --border-color: #d4e3ea;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei UI",
        "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

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

/* 顶部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.header .container {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 24px;
    height: 72px;
    max-width: none;
}

.logo h1 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(16px, 1.8vw, 32px);
    min-width: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-phone {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(14, 95, 122, 0.1);
    color: var(--primary-dark);
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.2;
    white-space: nowrap;
    text-decoration: none;
}

.nav-phone-desktop {
    justify-self: end;
}

.nav-phone-mobile {
    display: none;
}

.hero-phone {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 首页横幅 */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 24px 80px;
    background: #e4f1f6;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(228, 241, 246, 0.55), rgba(228, 241, 246, 0.72)),
        url("assets/images/index_bg01.jpg");
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    pointer-events: none;
    animation: heroFade 1.2s ease-out;
}

.hero-content {
    text-align: center;
    max-width: 860px;
    position: relative;
    z-index: 1;
    animation: riseIn 0.9s ease-out;
}

.hero-brand {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.25;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 32px;
}

.hero-description {
    background: rgba(255, 255, 255, 0.88);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 40px;
}

.hero-description p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.btn-primary {
    display: inline-block;
    padding: 16px 40px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-block;
    padding: 12px 28px;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* 合作渠道 */
.partners-section {
    background: var(--bg-secondary);
    padding: 72px 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.partner-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 16px;
    text-align: center;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition);
}

.partner-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

/* 核心业务 */
.business-section {
    background: var(--bg-primary);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.business-card {
    background: var(--bg-secondary);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.business-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: #fff;
    font-size: 1.4rem;
    font-weight: 700;
}

.business-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.business-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 权益产品 */
.products-section {
    background: var(--bg-secondary);
}

.benefit-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.benefit-summary-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: center;
    transition: var(--transition);
}

.benefit-summary-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.benefit-summary-item h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.benefit-summary-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.product-feature-block {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 40px;
    margin-bottom: 40px;
}

.product-feature-block h3 {
    font-size: 1.35rem;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.product-feature-block p {
    color: var(--text-secondary);
    font-size: 1.02rem;
    line-height: 1.85;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.product-card {
    background: var(--bg-primary);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--border-color);
}

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

.product-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    padding-right: 72px;
}

.product-subtitle {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.product-features {
    list-style: none;
}

.product-features li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    position: relative;
    padding-left: 20px;
}

.product-features li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 领取路径 */
.nselect-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 100px 0;
}

.nselect-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.nselect-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.nselect-desc {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 24px;
}

.nselect-detail {
    font-size: 1.05rem;
    line-height: 1.8;
    opacity: 0.85;
    margin-bottom: 32px;
}

.nselect-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 1.05rem;
}

.feature-check {
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    margin-top: 2px;
}

.nselect-visual {
    display: flex;
    justify-content: center;
}

.nselect-card {
    background: white;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 320px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: floatCard 4s ease-in-out infinite;
}

.nselect-card-header {
    background: var(--bg-secondary);
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.nselect-card-header span {
    font-weight: 600;
    color: var(--text-primary);
}

.nselect-card-body {
    padding: 24px;
}

.nselect-card-body > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.nselect-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.option.active {
    border-color: var(--primary-color);
    background: rgba(14, 95, 122, 0.06);
    color: var(--primary-color);
    font-weight: 700;
}

a.option-phone {
    text-decoration: none;
    display: block;
}

/* 关于我们 */
.about-section {
    background: var(--bg-primary);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-text strong {
    color: var(--primary-color);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 60px;
    padding-top: 60px;
    border-top: 1px solid var(--border-color);
}

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

.highlight-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.highlight-label {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 底部 */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 32px;
}

.footer-main h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer-main p {
    opacity: 0.7;
    font-size: 0.95rem;
}

.footer-phone {
    margin-top: 12px;
    opacity: 1 !important;
    color: #7ec8e3;
    font-weight: 700;
}

.footer-phone a {
    color: inherit;
    text-decoration: none;
}

.footer-phone a:hover,
.footer-phone a:active {
    text-decoration: underline;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.7;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    opacity: 0.6;
    font-size: 0.9rem;
    margin: 4px 0;
}

.footer-bottom a {
    color: inherit;
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

@keyframes riseIn {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes heroFade {
    from {
        opacity: 0;
        transform: scale(1.04);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes floatCard {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@media (max-width: 1280px) {
    .header .container {
        grid-template-columns: minmax(0, 1fr) auto auto;
        gap: 16px;
    }

    .nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
    }

    .nav .nav-phone {
        align-self: flex-start;
        margin-top: 4px;
    }

    .nav-phone-desktop {
        align-self: center;
        margin-top: 0;
        font-size: 0.85rem;
    }

    .nav.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

@media (max-width: 900px) {
    .benefit-summary,
    .partners-grid {
        grid-template-columns: 1fr 1fr;
    }

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

    .product-feature-block {
        padding: 28px 24px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 14px;
    }

    .hero-phone {
        display: inline-block;
        margin-bottom: 20px;
        font-size: 0.95rem;
    }

    .hero-description {
        padding: 24px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .nselect-text h2 {
        font-size: 1.8rem;
    }

    .about-highlights,
    .benefit-summary,
    .partners-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .header .container {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .logo h1 {
        font-size: 0.92rem;
    }

    .nav-phone-desktop {
        display: none;
    }

    .nav-phone-mobile {
        display: inline-block;
    }

    .hero {
        padding: 100px 16px 60px;
    }

    .hero-title {
        font-size: 1.55rem;
    }

    section {
        padding: 60px 0;
    }

    .business-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }
}