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

:root {
    --primary: #2d5016;
    --primary-light: #3d6b1e;
    --primary-dark: #1a3009;
    --gold: #c9a962;
    --gold-light: #d4bc7e;
    --text-dark: #1a1a1a;
    --text-gray: #666;
    --text-light: #999;
    --bg-light: #f8f7f4;
    --bg-cream: #f5f3ee;
    --white: #fff;
    --shadow: 0 10px 40px rgba(0,0,0,0.08);
    --shadow-hover: 0 20px 60px rgba(0,0,0,0.12);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    color: var(--text-dark);
    line-height: 1.8;
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

.section {
    padding: 100px 0;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255,255,255,0.98);
    box-shadow: 0 4px 30px rgba(0,0,0,0.08);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 4px;
}

.logo-sub {
    font-size: 10px;
    color: var(--gold);
    letter-spacing: 3px;
    font-weight: 500;
}

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 15px;
    color: var(--text-dark);
    position: relative;
    padding: 5px 0;
    transition: color 0.3s ease;
}

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

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

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

.nav-phone {
    text-align: right;
}

.nav-phone span {
    font-size: 12px;
    color: var(--text-light);
}

.nav-phone strong {
    display: block;
    font-size: 18px;
    color: var(--primary);
    font-weight: 600;
}

.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url('https://images.unsplash.com/photo-1585320806297-9794b3e4eeae?w=1920&h=1080&fit=crop') center/cover no-repeat;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,48,9,0.75) 0%, rgba(45,80,22,0.6) 50%, rgba(201,169,98,0.3) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: 8px;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 40px;
    opacity: 0.9;
    letter-spacing: 2px;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 15px;
    border-radius: 4px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    letter-spacing: 2px;
}

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

.btn-primary:hover {
    background: var(--gold-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201,169,98,0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-block {
    width: 100%;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--white);
    opacity: 0.7;
}

.hero-scroll span {
    font-size: 12px;
    letter-spacing: 2px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: var(--white);
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0%, 100% { transform: scaleY(1); opacity: 1; }
    50% { transform: scaleY(0.5); opacity: 0.5; }
}

.features {
    padding: 60px 0;
    background: var(--white);
    margin-top: -60px;
    position: relative;
    z-index: 2;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    background: var(--white);
    padding: 50px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: var(--white);
    font-size: 28px;
    line-height: 70px;
    border-radius: 50%;
    font-weight: 300;
}

.feature-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.feature-item p {
    font-size: 14px;
    color: var(--text-gray);
}

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

.section-tag {
    display: inline-block;
    font-size: 13px;
    color: var(--gold);
    letter-spacing: 4px;
    margin-bottom: 12px;
}

.section-title {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: 6px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-footer {
    text-align: center;
    margin-top: 50px;
}

.products {
    background: var(--bg-light);
}

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

.product-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.4s ease;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.product-img {
    position: relative;
    height: 240px;
    overflow: hidden;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover .product-img img {
    transform: scale(1.1);
}

.product-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 5px 12px;
    background: var(--gold);
    color: var(--white);
    font-size: 12px;
    border-radius: 3px;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-info p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 15px;
}

.product-price {
    display: flex;
    align-items: baseline;
    gap: 5px;
}

.product-price .price {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

.product-price .unit {
    font-size: 13px;
    color: var(--text-light);
}

.cases {
    background: var(--text-dark);
    color: var(--white);
}

.cases .section-title {
    color: var(--white);
}

.cases .section-desc {
    color: rgba(255,255,255,0.6);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 280px);
    gap: 20px;
}

.case-item {
    position: relative;
    overflow: hidden;
    border-radius: 6px;
}

.case-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.case-item:hover img {
    transform: scale(1.1);
}

.case-large {
    grid-column: span 2;
}

.case-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 60%);
    padding: 25px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.case-item:hover .case-overlay {
    opacity: 1;
}

.case-tag {
    font-size: 11px;
    color: var(--gold);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.case-overlay h3 {
    font-size: 18px;
    margin-bottom: 6px;
}

.case-overlay p {
    font-size: 13px;
    opacity: 0.8;
}

.news {
    background: var(--bg-cream);
}

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

.news-main {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.news-main img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.news-content {
    padding: 30px;
}

.news-date {
    font-size: 13px;
    color: var(--text-light);
}

.news-content h3 {
    font-size: 22px;
    margin: 12px 0;
    color: var(--text-dark);
}

.news-content p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 15px;
}

.news-link {
    color: var(--gold);
    font-size: 14px;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.news-item {
    background: var(--white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.news-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.news-item h4 {
    font-size: 16px;
    margin: 8px 0;
    color: var(--text-dark);
}

.news-item p {
    font-size: 13px;
    color: var(--text-gray);
}

.about {
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-images {
    position: relative;
}

.about-img-main {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: 8px;
}

.about-img-sub {
    position: absolute;
    bottom: -40px;
    right: -40px;
    width: 250px;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    border: 8px solid var(--white);
    box-shadow: var(--shadow);
}

.about-content {
    padding: 40px 0;
}

.about-lead {
    font-size: 18px;
    color: var(--text-dark);
    margin: 20px 0 30px;
    font-weight: 500;
}

.about-content p {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 2;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid #eee;
}

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

.stat-item strong {
    display: block;
    font-size: 36px;
    color: var(--primary);
    font-weight: 700;
}

.stat-item span {
    font-size: 13px;
    color: var(--text-gray);
}

.contact {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    font-size: 18px;
    line-height: 50px;
    text-align: center;
    border-radius: 50%;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 16px;
    margin-bottom: 5px;
    color: var(--text-dark);
}

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

.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.contact-form h3 {
    font-size: 22px;
    margin-bottom: 25px;
    color: var(--text-dark);
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s ease;
    background: var(--white);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 60px;
    padding-bottom: 50px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    font-size: 24px;
    margin-bottom: 15px;
    letter-spacing: 4px;
}

.footer-brand p {
    font-size: 14px;
    opacity: 0.7;
    line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--gold);
}

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

.footer-links a {
    font-size: 14px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--gold);
}

.footer-contact p {
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 8px;
}

.footer-bottom {
    padding: 25px 0;
    text-align: center;
    font-size: 13px;
    opacity: 0.6;
}

.side-contact {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.side-item {
    position: relative;
    cursor: pointer;
}

.side-icon {
    width: 50px;
    height: 50px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(45,80,22,0.3);
}

.side-icon img {
    width: 24px;
    height: 24px;
}

.side-item:hover .side-icon {
    background: var(--gold);
    transform: scale(1.1);
}

.side-popup {
    position: absolute;
    right: 65px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
}

.side-item:hover .side-popup {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.popup-content {
    background: var(--white);
    padding: 20px 25px;
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    text-align: center;
    min-width: 180px;
}

.popup-content h4 {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.phone-number {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 3px;
}

.phone-label {
    font-size: 12px;
    color: var(--text-light);
}

.qr-code {
    width: 120px;
    height: 120px;
    margin: 10px auto;
    background: #f5f5f5;
    padding: 8px;
    border-radius: 4px;
}

.qr-code img {
    width: 100%;
    height: 100%;
}

.wechat-id {
    font-size: 13px;
    color: var(--text-gray);
}

.topoff .side-icon {
    background: var(--text-gray);
}

.topoff:hover .side-icon {
    background: var(--primary);
}

@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }

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

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

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

    .case-large {
        grid-column: span 1;
    }

    .about-grid {
        gap: 40px;
    }

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

@media (max-width: 768px) {
    .nav-phone {
        display: none;
    }

    .nav-list {
        gap: 20px;
    }

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

    .hero-title {
        font-size: 32px;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .hero-btns {
        flex-direction: column;
        gap: 15px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid {
        grid-template-columns: 1fr 1fr;
        padding: 30px;
    }

    .products-grid,
    .news-grid,
    .contact-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-img-sub {
        right: 20px;
        bottom: -20px;
        width: 180px;
        height: 140px;
    }

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

    .cases-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .case-item {
        height: 250px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .side-contact {
        right: 10px;
    }

    .side-icon {
        width: 44px;
        height: 44px;
    }

    .side-popup {
        right: 55px;
    }
}

@media (max-width: 480px) {
    .nav-list {
        display: none;
    }

    .hero-title {
        font-size: 26px;
    }

    .hero {
        min-height: 600px;
    }

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

    .feature-item {
        display: flex;
        align-items: center;
        gap: 15px;
        text-align: left;
        padding: 15px 0;
        border-bottom: 1px solid #eee;
    }

    .feature-icon {
        margin: 0;
        width: 50px;
        height: 50px;
        font-size: 20px;
        line-height: 50px;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .stat-item strong {
        font-size: 28px;
    }
}

/* FAQ Section */
.faq {
    background: var(--bg-cream);
    padding: 80px 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    padding: 20px 30px;
    background: var(--white);
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question.active {
    background: var(--primary);
    color: var(--white);
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer.active {
    padding: 20px 30px;
    max-height: 200px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
}

.faq-icon {
    font-size: 20px;
    transition: transform 0.3s ease;
}

.faq-question.active .faq-icon {
    transform: rotate(180deg);
}