/* ============================================================
   贵阳高新众智发展有限公司 - 官网样式表
   ============================================================ */

/* ---- CSS Variables ---- */
:root {
    --color-primary: #1a5fb4;
    --color-primary-dark: #0d3b7a;
    --color-primary-light: #3584e4;
    --color-accent: #e66100;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fa;
    --color-bg-dark: #0d1b2a;
    --color-text: #1a1a2e;
    --color-text-light: #555;
    --color-text-muted: #888;
    --color-border: #e0e4e8;
    --color-white: #ffffff;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.14);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    --max-width: 1200px;
    --header-height: 72px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-primary-light);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ---- Container ---- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    border-radius: 50px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    letter-spacing: 0.5px;
}

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

.btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 95, 180, 0.3);
}

.btn--outline {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn--outline:hover {
    background: var(--color-white);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

.btn--block {
    width: 100%;
}

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

.btn--secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 95, 180, 0.3);
}

.btn-icon {
    display: inline-block;
    margin-right: 6px;
    font-size: 1rem;
    vertical-align: middle;
}

/* ============================================================
   Header / 导航栏
   ============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition);
    height: var(--header-height);
}

.header--scrolled {
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 2px 20px var(--color-shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header--scrolled .logo__text,
.header--scrolled .nav__link {
    color: var(--color-text);
}

.header--scrolled .logo__icon {
    color: var(--color-primary);
}

.header--scrolled .nav__link::after {
    background: var(--color-primary);
}

.header--scrolled .nav__link:hover,
.header--scrolled .nav__link.active {
    color: var(--color-primary);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.logo__icon {
    font-size: 1.6rem;
    color: var(--color-white);
    transition: color var(--transition);
}

.logo__text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
    transition: color var(--transition);
}

/* Nav */
.nav__list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav__link {
    display: block;
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    position: relative;
    transition: color var(--transition);
    border-radius: 6px;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--color-white);
    transform: scaleX(0);
    transition: transform var(--transition);
}

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

.nav__link:hover::after,
.nav__link.active::after {
    transform: scaleX(1);
}

/* Menu Toggle (Mobile) */
.menu-toggle {
    display: none;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 6px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2.5px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition);
}

.header--scrolled .menu-toggle span {
    background: var(--color-text);
}

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

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

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

/* ============================================================
   Hero / 首屏
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0d1b2a 0%, #1a3a5c 40%, #1a5fb4 100%);
    overflow: hidden;
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(53, 132, 228, 0.15) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(230, 97, 0, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 800px;
}

.hero__title {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 16px;
    letter-spacing: 2px;
    line-height: 1.2;
    animation: fadeInUp 1s ease forwards;
}

.hero__subtitle {
    font-size: 1.4rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 8px;
    animation: fadeInUp 1s ease 0.2s forwards;
    opacity: 0;
}

.hero__desc {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.4s forwards;
    opacity: 0;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

/* Scroll indicator */
.hero__scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    letter-spacing: 2px;
    animation: fadeInUp 1s ease 1s forwards;
    opacity: 0;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255, 255, 255, 0.5);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease infinite;
}

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

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

.section__title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
    position: relative;
    display: inline-block;
}

.section__title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    margin: 12px auto 0;
    border-radius: 2px;
}

.section__subtitle {
    font-size: 1.05rem;
    color: var(--color-text-light);
    margin-top: 8px;
}

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

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about__content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 20px;
}

.about__content p {
    margin-bottom: 16px;
    color: var(--color-text-light);
    line-height: 1.8;
}

.about__content strong {
    color: var(--color-primary);
    font-weight: 600;
}

.about__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-bg-alt);
    color: var(--color-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(26, 95, 180, 0.15);
}

/* About image placeholder */
.about__image-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    background: linear-gradient(135deg, var(--color-bg-alt), #e8edf5);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 1rem;
    border: 2px dashed var(--color-border);
}

.placeholder-icon {
    font-size: 3rem;
    color: var(--color-primary-light);
    opacity: 0.5;
}

.placeholder-hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    opacity: 0.7;
}

/* ============================================================
   Partner / 合作伙伴
   ============================================================ */
.partner {
    background: var(--color-bg-alt);
}

.partner__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 960px;
    margin: 0 auto;
}

.partner__card {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 36px;
    align-items: center;
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: 36px 40px;
    box-shadow: 0 4px 20px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.partner__card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px var(--color-shadow-hover);
}

.partner__logo-placeholder {
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--border-radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
}

.partner__logo--baison {
    background: linear-gradient(135deg, #1a3a5c, #1a5fb4);
}

.partner__logo--huawei {
    background: linear-gradient(135deg, #cf0a2c, #e6223e);
}

.partner__logo-icon {
    font-size: 2.2rem;
    opacity: 0.8;
}

.partner__info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 16px;
}

.partner__info p {
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.8;
}

.partner__list li {
    padding: 8px 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: 20px;
}

.partner__list li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--color-primary-light);
    font-size: 0.7rem;
    top: 10px;
}

/* ============================================================
   Products / 产品中心
   ============================================================ */
.products {
    background: var(--color-bg);
}

.products__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 36px 28px;
    text-align: center;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition);
    transform-origin: left;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--color-shadow-hover);
    border-color: transparent;
}

.product-card:hover::before {
    transform: scaleX(1);
}

.product-card--featured {
    border-color: var(--color-primary-light);
}

.product-card--featured::before {
    transform: scaleX(1);
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.product-card__badge {
    position: absolute;
    top: 16px;
    right: -28px;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 4px 36px;
    font-size: 0.75rem;
    font-weight: 600;
    transform: rotate(45deg);
    letter-spacing: 1px;
}

.product-card__icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(26, 95, 180, 0.08), rgba(53, 132, 228, 0.15));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--color-primary);
    transition: all var(--transition);
}

.product-card:hover .product-card__icon {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.05);
}

.product-card__title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.product-card__desc {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 18px;
}

.product-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.product-card__tags span {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-alt);
    border-radius: 12px;
    font-size: 0.78rem;
    color: var(--color-text-light);
}

/* ============================================================
   Advantages / 核心优势
   ============================================================ */
.advantages {
    background: var(--color-bg-alt);
}

.advantages__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.advantage-item {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: 36px 28px;
    transition: all var(--transition);
    position: relative;
}

.advantage-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 36px var(--color-shadow-hover);
}

.advantage-item__number {
    font-size: 2.6rem;
    font-weight: 800;
    color: rgba(26, 95, 180, 0.08);
    line-height: 1;
    margin-bottom: 12px;
    transition: color var(--transition);
}

.advantage-item:hover .advantage-item__number {
    color: rgba(26, 95, 180, 0.18);
}

.advantage-item h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 12px;
}

.advantage-item p {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================================
   Contact / 联系我们
   ============================================================ */
.contact {
    background: var(--color-bg);
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

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

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact__icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: linear-gradient(135deg, rgba(26, 95, 180, 0.08), rgba(53, 132, 228, 0.15));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--color-primary);
}

.contact__item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.contact__item p {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* Contact CTA Card */
.contact__cta {
    background: linear-gradient(135deg, #0d3b7a 0%, #1a5fb4 100%);
    color: var(--color-white);
    border-radius: var(--border-radius);
    padding: 50px 40px;
    box-shadow: 0 12px 40px rgba(26, 95, 180, 0.2);
    text-align: center;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.contact__cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(255, 255, 255, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.contact__cta > * {
    position: relative;
    z-index: 1;
}

.contact__cta-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-white);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact__cta h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--color-white);
}

.contact__cta p {
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
    margin-bottom: 28px;
    max-width: 380px;
}

.contact__cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.contact__cta .btn--secondary {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--color-white);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

/* ============================================================
   Footer / 页脚
   ============================================================ */
.footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__brand .logo__text {
    font-size: 1.2rem;
}

.footer__brand .logo__icon {
    font-size: 1.4rem;
}

.footer__brand p {
    margin-top: 16px;
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
}

.footer__links h4,
.footer__contact h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 16px;
}

.footer__links ul li {
    margin-bottom: 10px;
}

.footer__links ul li a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer__links ul li a:hover {
    color: var(--color-white);
}

.footer__contact p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.45);
}

.footer__bottom a {
    color: rgba(255, 255, 255, 0.55);
}

.footer__bottom a:hover {
    color: var(--color-white);
}

.sep {
    margin: 0 12px;
    opacity: 0.3;
}

/* Footer ICP / 备案号 */
.footer__icp {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
    padding: 16px 0 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer__icp a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color var(--transition);
}

.footer__icp a:hover {
    color: rgba(255, 255, 255, 0.85);
}

.footer__icp-icon {
    width: 16px;
    height: 16px;
    display: inline-block;
    vertical-align: middle;
}

.footer__icp .sep {
    margin: 0 8px;
    opacity: 0.25;
}

@media (max-width: 768px) {
    .footer__icp {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    .footer__icp .sep {
        display: none;
    }
}

/* ============================================================
   Back to Top
   ============================================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    box-shadow: 0 4px 16px rgba(26, 95, 180, 0.3);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(26, 95, 180, 0.4);
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollBounce {
    0%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    50% {
        transform: rotate(45deg) translateY(8px);
    }
}

/* ============================================================
   Responsive / 响应式设计
   ============================================================ */

/* Tablet (≤ 1024px) */
@media (max-width: 1024px) {
    .about__grid {
        gap: 40px;
    }

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

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

    .partner__card {
        grid-template-columns: 200px 1fr;
        gap: 30px;
    }

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

/* Mobile (≤ 768px) */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .section {
        padding: 70px 0;
    }

    .section__title {
        font-size: 1.6rem;
    }

    .section__header {
        margin-bottom: 40px;
    }

    /* Hero */
    .hero__title {
        font-size: 1.8rem;
    }

    .hero__subtitle {
        font-size: 1.05rem;
    }

    .hero__desc {
        font-size: 0.92rem;
    }

    /* Mobile nav overlay */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        box-shadow: -4px 0 30px rgba(0, 0, 0, 0.15);
        transition: right var(--transition);
        padding: 80px 28px 40px;
        z-index: 1000;
    }

    .nav.active {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        gap: 4px;
    }

    .nav__link {
        color: var(--color-text);
        padding: 12px 16px;
        font-size: 1rem;
        width: 100%;
    }

    .nav__link::after {
        background: var(--color-primary);
        left: 16px;
        right: 16px;
        bottom: 4px;
    }

    .menu-toggle {
        display: flex;
    }

    /* Grid layouts */
    .about__grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about__image-placeholder {
        aspect-ratio: 16 / 9;
    }

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

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

    .contact__grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact__cta {
        padding: 36px 24px;
    }

    .contact__cta h3 {
        font-size: 1.3rem;
    }

    /* Footer */
    .footer__grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer__bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .btn {
        padding: 12px 28px;
        font-size: 0.92rem;
    }

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

    .partner__card {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .partner__logo-placeholder {
        max-width: 160px;
        margin: 0 auto;
        aspect-ratio: 1;
    }

    .partner__info h3 {
        font-size: 1.15rem;
    }
}

/* Small Mobile (≤ 480px) */
@media (max-width: 480px) {
    .hero__title {
        font-size: 1.5rem;
    }

    .hero__subtitle {
        font-size: 0.95rem;
    }

    .section__title {
        font-size: 1.35rem;
    }

    .product-card {
        padding: 28px 20px;
    }

    .advantage-item {
        padding: 28px 20px;
    }
}

/* ============================================================
   Privacy Page / 隐私政策页面
   ============================================================ */

/* Hero Banner */
.privacy-hero {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #0d1b2a 0%, #1a3a5c 40%, #1a5fb4 100%);
    text-align: center;
    position: relative;
}

.privacy-hero__content {
    position: relative;
    z-index: 1;
}

.privacy-hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.privacy-hero__meta {
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.65);
}

/* Content Section */
.privacy-content {
    background: var(--color-bg);
    padding-top: 50px;
}

.privacy-content__inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
}

.privacy-summary {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: 16px;
    padding: 16px 20px;
    background: var(--color-bg-alt);
    border-left: 3px solid var(--color-primary-light);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

/* Table of Contents */
.privacy-toc {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 24px 28px;
    margin-bottom: 36px;
}

.privacy-toc h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
}

.privacy-toc ul {
    list-style: none;
    padding: 0;
}

.privacy-toc ul li {
    margin-bottom: 6px;
}

.privacy-toc ul li a {
    color: var(--color-primary);
    font-size: 0.92rem;
    transition: color var(--transition);
}

.privacy-toc ul li a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Content Headings */
.privacy-content__inner h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-top: 48px;
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-primary-light);
}

.privacy-content__inner h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 28px;
    margin-bottom: 12px;
}

/* Content Paragraphs */
.privacy-content__inner p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: 14px;
}

.privacy-content__inner strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Content Lists */
.privacy-content__inner ul {
    padding-left: 24px;
    margin-bottom: 16px;
}

.privacy-content__inner ul li {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 6px;
    list-style: disc;
}

/* Definition Box */
.privacy-def {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: 20px 24px;
    margin-bottom: 20px;
}

.privacy-def p {
    margin-bottom: 10px !important;
    font-size: 0.92rem !important;
}

.privacy-def p:last-child {
    margin-bottom: 0 !important;
}

/* Contact Box */
.privacy-contact {
    background: linear-gradient(135deg, rgba(26, 95, 180, 0.04), rgba(53, 132, 228, 0.08));
    border: 1px solid rgba(26, 95, 180, 0.15);
    border-radius: var(--border-radius-sm);
    padding: 20px 24px;
    margin-bottom: 20px;
}

.privacy-contact p {
    margin-bottom: 8px !important;
}

.privacy-contact p:last-child {
    margin-bottom: 0 !important;
}

/* Responsive */
@media (max-width: 768px) {
    .privacy-hero {
        padding: 110px 0 40px;
    }

    .privacy-hero h1 {
        font-size: 1.6rem;
    }

    .privacy-content__inner h2 {
        font-size: 1.2rem;
        margin-top: 36px;
    }

    .privacy-content__inner h3 {
        font-size: 1rem;
    }

    .privacy-toc {
        padding: 18px 20px;
    }

    .privacy-def,
    .privacy-contact {
        padding: 16px 18px;
    }
}

@media (max-width: 480px) {
    .privacy-hero h1 {
        font-size: 1.35rem;
    }

    .privacy-content__inner {
        padding: 0 16px;
    }
}