/* ============================
   金利旺供应商 - 现代简约风格
   配色：深绿 + 金色 + 浅灰
   ============================ */

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a4731;
    --primary-light: #2d6a4f;
    --accent: #d4a843;
    --accent-light: #f0d078;
    --white: #ffffff;
    --light: #f7fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #0f172a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-lg: 20px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--gray-700);
    background: var(--white);
    overflow-x: hidden;
}

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

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

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

.advantage-icon svg,
.why-icon svg,
.info-icon svg,
.feature-icon svg {
    display: block;
    flex-shrink: 0;
}

/* ============================
   导航栏
   ============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar.scrolled {
    background: rgba(26,71,49,0.97);
    box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

.navbar.scrolled .logo span,
.navbar.scrolled .nav-links a {
    color: var(--white);
}

.navbar.scrolled .logo span {
    color: var(--accent);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
    transition: height 0.3s;
}

.navbar.scrolled .nav-container {
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    transition: color 0.3s;
}

.logo img {
    height: 42px;
    width: auto;
    transition: height 0.3s;
}

.navbar.scrolled .logo img {
    height: 36px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s;
    position: relative;
    padding: 8px 16px;
    border-radius: 8px;
}

.nav-links a:hover {
    color: var(--primary);
    background: rgba(26,71,49,0.06);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--accent);
    background: rgba(255,255,255,0.1);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: all 0.3s;
    transform: translateX(-50%);
    border-radius: 1px;
}

.nav-links a:hover::after {
    width: 60%;
}

/* ============================
   Hero Section - 全屏视频风格
   ============================ */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f2a1d 0%, #1a4731 40%, #2d6a4f 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(212,168,67,0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(45,106,79,0.3) 0%, transparent 50%);
    animation: heroBg 15s ease-in-out infinite alternate;
}

@keyframes heroBg {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-5%, -5%) rotate(3deg); }
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--white), transparent);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(212,168,67,0.15);
    border: 1px solid rgba(212,168,67,0.3);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-light);
    margin-bottom: 30px;
    letter-spacing: 2px;
    animation: fadeInDown 0.8s ease-out;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: 4px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
    background: linear-gradient(135deg, var(--white) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.4rem;
    margin-bottom: 60px;
    opacity: 0.85;
    font-weight: 300;
    letter-spacing: 6px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-stats {
    display: flex;
    gap: 60px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.2);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.stat-unit {
    font-size: 1.2rem;
    color: var(--accent-light);
    font-weight: 600;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 8px;
    letter-spacing: 2px;
}

.cta-button {
    display: inline-block;
    padding: 16px 48px;
    background: var(--accent);
    color: var(--primary);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.05rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(212,168,67,0.3);
    letter-spacing: 2px;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(212,168,67,0.5);
    background: var(--accent-light);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.5);
    z-index: 2;
    animation: fadeIn 1s ease-out 1.2s both;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255,255,255,0.4);
    border-bottom: 2px solid rgba(255,255,255,0.4);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.4; }
    50% { transform: rotate(45deg) translate(6px, 6px); opacity: 1; }
}

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

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ============================
   Section 通用样式
   ============================ */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 70px;
}

.section-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(26,71,49,0.06);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.8rem;
    color: var(--gray-900);
    margin-bottom: 16px;
    font-weight: 800;
    letter-spacing: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-500);
    font-weight: 300;
}

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

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

.about-text h3 {
    font-size: 2rem;
    color: var(--gray-900);
    margin-bottom: 20px;
    font-weight: 700;
}

.highlight {
    font-size: 1.15rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 20px;
    padding-left: 16px;
    border-left: 4px solid var(--accent);
}

.about-text p {
    margin-bottom: 16px;
    line-height: 1.9;
    color: var(--gray-500);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--gray-200);
}

.stat-box {
    text-align: center;
    padding: 20px 10px;
    border-radius: var(--radius);
    transition: all 0.3s;
}

.stat-box:hover {
    background: rgba(26,71,49,0.03);
}

.stat-number-small {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-info strong {
    display: block;
    color: var(--gray-900);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.stat-info span {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform 0.5s;
}

.about-image:hover img {
    transform: scale(1.02);
}

.about-image::after {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: 3px solid var(--accent);
    border-radius: var(--radius-lg);
    z-index: -1;
    transition: all 0.5s;
}

.about-image:hover::after {
    top: 15px;
    left: 15px;
    right: -15px;
    bottom: -15px;
}

/* ============================
   核心优势
   ============================ */
.advantages {
    background: var(--light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.4s;
}

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

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-200);
}

.advantage-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: rgba(26,71,49,0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: all 0.4s;
    color: var(--primary);
}

.advantage-card:hover .advantage-icon {
    background: var(--primary);
    transform: scale(1.1);
    color: var(--white);
}

.advantage-card h3 {
    font-size: 1.2rem;
    color: var(--gray-900);
    margin-bottom: 12px;
    font-weight: 700;
}

.advantage-card p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}

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

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--gray-200);
    position: relative;
}

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

.product-image {
    height: 200px;
    overflow: hidden;
    position: relative;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.3));
    opacity: 0;
    transition: opacity 0.4s;
}

.product-card:hover .product-image::after {
    opacity: 1;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-info {
    padding: 28px;
}

.product-info h3 {
    font-size: 1.3rem;
    color: var(--gray-900);
    margin-bottom: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.product-info h3::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--accent);
    border-radius: 2px;
}

.product-info p {
    color: var(--gray-500);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ============================
   为什么选择我们
   ============================ */
.why-choose {
    background: linear-gradient(135deg, #0f2a1d 0%, #1a4731 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.why-choose::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.why-choose .section-badge {
    background: rgba(212,168,67,0.15);
    color: var(--accent-light);
}

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

.why-choose .section-subtitle {
    color: rgba(255,255,255,0.6);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.why-item {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.08);
    transition: all 0.4s;
    backdrop-filter: blur(10px);
}

.why-item:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(212,168,67,0.3);
    transform: translateX(8px);
}

.why-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: transform 0.4s;
    color: var(--primary);
}

.why-item:hover .why-icon {
    transform: scale(1.1) rotate(5deg);
}

.why-item h4 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--white);
    font-weight: 700;
}

.why-item p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

/* ============================
   仓储配送
   ============================ */
.warehouse {
    background: var(--light);
}

.warehouse-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.warehouse-image {
    position: relative;
}

.warehouse-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform 0.5s;
}

.warehouse-image:hover img {
    transform: scale(1.02);
}

.warehouse-image .experience-badge {
    position: absolute;
    bottom: -24px;
    right: -24px;
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    box-shadow: var(--shadow-lg);
    animation: badgeFloat 3s ease-in-out infinite;
}

@keyframes badgeFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.experience-badge .years {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.experience-badge .label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.warehouse-info h3 {
    font-size: 2rem;
    color: var(--gray-900);
    margin-bottom: 20px;
    font-weight: 700;
}

.warehouse-info > p {
    margin-bottom: 36px;
    line-height: 1.9;
    color: var(--gray-500);
}

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

.feature {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
    border-left: 4px solid transparent;
}

.feature:hover {
    border-left-color: var(--accent);
    transform: translateX(8px);
    box-shadow: var(--shadow);
}

.feature-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

/* footer logo 文字版 */
.footer-logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 20px;
    letter-spacing: 4px;
    opacity: 0.9;
}

.feature strong {
    display: block;
    color: var(--gray-900);
    margin-bottom: 4px;
    font-size: 1rem;
}

.feature span {
    font-size: 0.85rem;
    color: var(--gray-500);
}

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

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

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

.info-card {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: var(--light);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
    border: 1px solid transparent;
}

.info-card:hover {
    background: var(--white);
    border-color: var(--primary);
    box-shadow: var(--shadow);
    transform: translateY(-4px);
}

.info-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: transform 0.3s;
    background: rgba(26,71,49,0.08);
    color: var(--primary);
}

.info-card:hover .info-icon {
    transform: scale(1.1);
}

.info-text h4 {
    font-size: 1.1rem;
    color: var(--gray-900);
    margin-bottom: 8px;
    font-weight: 700;
}

.info-text p {
    color: var(--gray-500);
    line-height: 1.7;
    font-size: 0.95rem;
}

.contact-qrcodes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.qr-card {
    background: var(--light);
    padding: 24px 16px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s;
    border: 2px solid transparent;
}

.qr-card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: var(--shadow);
}

.qr-card img {
    width: 100%;
    max-width: 140px;
    margin: 0 auto 12px;
    border-radius: 8px;
    transition: transform 0.4s;
}

.qr-card:hover img {
    transform: scale(1.05);
}

.qr-card span {
    color: var(--gray-900);
    font-weight: 600;
    font-size: 0.9rem;
}

/* ============================
   Footer
   ============================ */
.footer {
    background: var(--gray-900);
    color: rgba(255,255,255,0.8);
    padding: 80px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo img {
    height: 48px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-logo p {
    opacity: 0.6;
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    margin-bottom: 24px;
    font-size: 1.1rem;
    font-weight: 700;
    position: relative;
    padding-bottom: 12px;
}

.footer-links h4::after,
.footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-links a:hover {
    color: var(--accent);
    transform: translateX(4px);
    display: inline-flex;
}

.footer-links a::before {
    content: '›';
    font-size: 1.2rem;
    color: var(--accent);
    opacity: 0;
    transition: opacity 0.3s;
}

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

.footer-contact p {
    margin-bottom: 12px;
    opacity: 0.6;
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid rgba(255,255,255,0.08);
    opacity: 0.5;
    font-size: 0.85rem;
}

/* ============================
   滚动动画
   ============================ */
.animate-on-scroll {
    opacity: 0;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0) !important;
}

/* 从不同方向进入的动画类 */
.fade-up {
    transform: translateY(40px);
}

.fade-left {
    transform: translateX(-40px);
}

.fade-right {
    transform: translateX(40px);
}

.scale-in {
    transform: scale(0.9);
}

/* 为不同元素设置不同延迟 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ============================
   返回顶部按钮
   ============================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
}

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

@media (max-width: 768px) {
    .about-content,
    .warehouse-content,
    .contact-content,
    .footer-content,
    .why-grid {
        grid-template-columns: 1fr;
    }

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

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

    .hero-stats {
        flex-direction: row;
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .stat-item {
        flex: 1;
        min-width: 70px;
        padding: 0 5px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .stat-unit {
        font-size: 0.9rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .hero p {
        font-size: 1.1rem;
        letter-spacing: 3px;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .contact-qrcodes {
        grid-template-columns: repeat(3, 1fr);
    }

    .nav-links {
        display: none;
    }

    section {
        padding: 70px 0;
    }

    .warehouse-image .experience-badge {
        width: 90px;
        height: 90px;
        bottom: -16px;
        right: -16px;
    }

    .experience-badge .years {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .contact-qrcodes {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-stats {
        gap: 16px;
    }

    .stat-number {
        font-size: 2.5rem;
    }
}