/**
 * main.css - 素旅SOLUXE 企业官网主样式
 * 风格：欧美简约高端 | 主色：深灰/黑 | 点缀：金色 #c9a96e
 * 响应式：Mobile First
 */

/* ============================================
   1. CSS 变量 & Reset
   ============================================ */
:root {
    --color-primary: #c9a96e;
    --color-primary-dark: #b8933f;
    --color-primary-light: #e8d5b0;
    --color-black: #111111;
    --color-gray-900: #1a1a1a;
    --color-gray-800: #2d2d2d;
    --color-gray-700: #4a4a4a;
    --color-gray-600: #6b6b6b;
    --color-gray-500: #8a8a8a;
    --color-gray-400: #b0b0b0;
    --color-gray-300: #d4d4d4;
    --color-gray-200: #eaeaea;
    --color-gray-100: #f5f5f5;
    --color-white: #ffffff;
    --color-success: #2d8f5e;
    --color-error: #c0392b;
    --color-warning: #d4a017;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Playfair Display', 'Georgia', 'Times New Roman', serif;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 40px rgba(0,0,0,0.15);

    --radius-sm: 2px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
    --header-height: 72px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-black);
    background: var(--color-white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: 0.01em;
}

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

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

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: 1rem;
}

::selection {
    background: var(--color-primary-light);
    color: var(--color-black);
}

/* ============================================
   2. 公共布局
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 300;
    text-align: center;
    margin-bottom: 16px;
    color: var(--color-black);
    letter-spacing: 0.02em;
}

.section-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 2px;
    background: var(--color-primary);
    margin: 20px auto 0;
}

.section-subtitle {
    font-size: 1rem;
    text-align: center;
    color: var(--color-gray-500);
    margin-bottom: 56px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: 0.02em;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
    text-align: center;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.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);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

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

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

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

.btn-dark:hover {
    background: var(--color-gray-800);
    border-color: var(--color-gray-800);
}

/* ============================================
   3. Header（固定导航）
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-shrink: 0;
}

.logo-cn {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.logo-en {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-gray-400);
    letter-spacing: 3px;
    text-transform: uppercase;
}

/* 桌面端导航 */
.nav-desktop {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-desktop a {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-gray-600);
    padding: 8px 0;
    position: relative;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.nav-desktop a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

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

.nav-desktop a:hover,
.nav-desktop a.active {
    color: var(--color-black);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.lang-switch {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-gray-500);
    padding: 6px 14px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.lang-switch:hover {
    color: var(--color-black);
    border-color: var(--color-black);
}

.admin-link, .logout-link {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.admin-link:hover, .logout-link:hover {
    color: var(--color-black);
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-black);
    border-radius: 1px;
    transition: var(--transition);
}

.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);
}

/* 移动端导航菜单 */
.nav-mobile {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: auto;
    background: var(--color-white);
    flex-direction: column;
    padding: 12px 20px 20px;
    gap: 2px;
    z-index: 999;
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
    border-radius: 0 0 12px 12px;
}

.nav-mobile.active {
    display: flex;
}

.nav-mobile a {
    display: block;
    padding: 18px 24px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    letter-spacing: 0.05em;
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-mobile a:last-child {
    border-bottom: none;
}

.nav-mobile a:hover,
.nav-mobile a.active {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

/* ============================================
   4. Hero 轮播区
   ============================================ */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 650px;
    overflow: hidden;
    margin-top: var(--header-height);
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide.active {
    opacity: 1;
    z-index: 1;
}

.hero-slide img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-slide::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.25), rgba(0,0,0,0.55));
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--color-white);
    padding: 0 24px;
    max-width: 800px;
}

.hero-content h1 {
    font-family: var(--font-serif);
    font-size: 3.8rem;
    font-weight: 400;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: 0.02em;
    text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.hero-content p {
    font-size: 1.15rem;
    font-weight: 300;
    line-height: 1.8;
    margin-bottom: 40px;
    opacity: 0.9;
    letter-spacing: 0.03em;
}

.hero-content .btn {
    font-size: 0.85rem;
    padding: 16px 44px;
}

/* 轮播指示器 */
.hero-indicators {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 16px;
}

.hero-indicators button {
    width: 32px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255,255,255,0.4);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.hero-indicators button.active {
    background: var(--color-white);
    width: 48px;
}

/* 轮播箭头 */
.hero-prev, .hero-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: var(--color-white);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.2);
}

.hero-prev { left: 24px; }
.hero-next { right: 24px; }

.hero-prev:hover, .hero-next:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.4);
}

/* ============================================
   5. 品牌标语区
   ============================================ */
.brand-slogan {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.brand-slogan::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(201,169,110,0.08) 0%, transparent 70%);
    pointer-events: none;
}

.brand-slogan h2 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 300;
    color: var(--color-primary-light);
    letter-spacing: 4px;
    font-style: italic;
}

/* ============================================
   6. 核心优势区
   ============================================ */
.advantages {
    background: var(--color-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.advantage-card {
    text-align: center;
    padding: 48px 28px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid transparent;
}

.advantage-card:hover {
    border-color: var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-primary);
}

.advantage-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-black);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

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

/* ============================================
   7. 产品展示区
   ============================================ */
.products-preview {
    background: var(--color-gray-100);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.product-card img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover img {
    transform: scale(1.03);
}

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

.product-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-black);
    letter-spacing: 0.02em;
}

.product-card p {
    font-size: 0.85rem;
    color: var(--color-gray-500);
    line-height: 1.6;
    margin-bottom: 20px;
}

.product-card .btn {
    width: 100%;
    text-align: center;
}

/* ============================================
   8. CTA 区
   ============================================ */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background: var(--color-black);
    color: var(--color-white);
}

.cta-section h2 {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 300;
    margin-bottom: 20px;
    letter-spacing: 0.03em;
}

.cta-section p {
    font-size: 1rem;
    color: var(--color-gray-500);
    margin-bottom: 40px;
    letter-spacing: 0.02em;
}

/* ============================================
   9. 关于我们页面
   ============================================ */
.about-hero {
    background: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/about_hero.jpg') center/cover no-repeat;
    padding: 140px 0 100px;
    text-align: center;
}

.about-hero h1,
.about-hero p {
    color: #ffffff;
    text-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.about-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.5);
    letter-spacing: 0.03em;
}

.about-hero p {
    font-size: 1.05rem;
    color: var(--color-gray-500);
    letter-spacing: 0.02em;
}

.about-story {
    padding: 80px 0;
}

.about-story .container {
    max-width: 800px;
}

.about-story h2 {
    font-size: 1.8rem;
    font-weight: 300;
    margin-bottom: 28px;
    color: var(--color-black);
    letter-spacing: 0.03em;
}

.about-story p {
    font-size: 1rem;
    color: var(--color-gray-600);
    line-height: 2;
    margin-bottom: 20px;
}

.about-advantages {
    padding: 80px 0;
    background: var(--color-gray-100);
}

/* ============================================
   10. 产品中心页面
   ============================================ */
.products-hero {
    background: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/products_hero.jpg') center/cover no-repeat;
    padding: 140px 0 100px;
    text-align: center;
}

.products-hero h1,
.products-hero p {
    color: #ffffff;
    text-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.products-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: 0.03em;
    text-shadow: 0 2px 12px rgba(0,0,0,0.5);
}

.products-hero p {
    font-size: 1.05rem;
    color: var(--color-gray-500);
    letter-spacing: 0.02em;
}

.products-list {
    padding: 80px 0;
}

/* 产品筛选按钮 */
.product-filters {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 56px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 28px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-gray-600);
    background: var(--color-white);
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.filter-btn:hover {
    border-color: var(--color-black);
    color: var(--color-black);
}

.filter-btn.active {
    background: var(--color-black);
    color: var(--color-white);
    border-color: var(--color-black);
}

/* 产品全卡片（大卡） */
.products-full-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 40px;
}

.product-full-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
}

.product-full-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.product-images-wrapper {
    position: relative;
    overflow: hidden;
    background: var(--color-gray-100);
}

.product-main-image img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-full-card:hover .product-main-image img {
    transform: scale(1.04);
}

.product-thumbs {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(0,0,0,0.03);
}

.product-thumb {
    width: 56px;
    height: 56px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition);
    border: 1px solid transparent;
}

.product-thumb:hover,
.product-thumb.active {
    opacity: 1;
    border-color: var(--color-primary);
}

.product-full-card .product-card-body {
    padding: 28px;
}

.product-category {
    display: inline-block;
    padding: 4px 14px;
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.product-desc {
    font-size: 0.9rem;
    color: var(--color-gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 24px;
}

.product-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.product-feature span:first-child {
    color: var(--color-primary);
    font-weight: 700;
    flex-shrink: 0;
}

.product-feature span:last-child {
    color: var(--color-gray-700);
}

.product-full-card .btn {
    width: 100%;
    text-align: center;
}

/* 服务卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 28px;
}

.service-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--color-gray-200);
}

.service-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-primary-light);
}

.service-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--color-primary);
}

.service-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-black);
    letter-spacing: 0.01em;
}

.service-card p {
    font-size: 0.85rem;
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ============================================
   11. 联系我们页面
   ============================================ */
.contact-hero {
    background: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/contact_hero.jpg') center/cover no-repeat;
    padding: 140px 0 100px;
    text-align: center;
}

.contact-hero h1,
.contact-hero p {
    color: #ffffff;
    text-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.contact-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: 0.03em;
}
    text-shadow: 0 2px 12px rgba(0,0,0,0.5);

.contact-hero p {
    font-size: 1.05rem;
    color: var(--color-gray-500);
    letter-spacing: 0.02em;
}

.contact-content {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
}

.contact-form h2, .contact-info h2 {
    font-size: 1.6rem;
    font-weight: 300;
    margin-bottom: 28px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-gray-600);
    margin-bottom: 8px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--color-white);
    color: var(--color-black);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(201, 169, 110, 0.15);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.char-count {
    text-align: right;
    font-size: 0.75rem;
    color: var(--color-gray-400);
    margin-top: 4px;
}

.form-success {
    padding: 16px 20px;
    background: #f0f7f0;
    color: #2d5a2d;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    display: none;
    border-left: 3px solid var(--color-success);
}

.form-success.active {
    display: block;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 28px;
}

.contact-info-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-info-item h4 {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-black);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.contact-info-item p {
    font-size: 0.9rem;
    color: var(--color-gray-500);
}

.contact-info-item a {
    color: var(--color-primary);
}

.contact-info-item a:hover {
    color: var(--color-primary-dark);
}

.contact-social-links {
    display: flex;
    gap: 12px;
}

.contact-social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    transition: var(--transition);
}

.contact-social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* 社交媒体网格 */
.social-media-section {
    margin-top: 36px;
}

.social-media-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.social-media-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.social-media-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.social-media-card .sm-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: white;
}

.social-media-card .sm-icon svg {
    width: 20px;
    height: 20px;
}

.social-media-card .sm-info {
    flex: 1;
    min-width: 0;
}

.social-media-card .sm-platform {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.social-media-card .sm-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-black);
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.social-media-card .sm-arrow {
    color: var(--color-gray-300);
    font-size: 0.8rem;
    flex-shrink: 0;
    transition: var(--transition);
}

.social-media-card:hover .sm-arrow {
    color: var(--color-primary);
    transform: translateX(3px);
}

@media (max-width: 768px) {
    .social-media-grid {
        grid-template-columns: 1fr;
    }
}

/* 微信二维码区域 */
.wechat-qr-section {
    margin-top: 36px;
    padding: 28px;
    background: var(--color-gray-100);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--color-gray-200);
}

.wechat-qr-section h4 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: 4px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.wechat-qr-section .wechat-id {
    font-size: 0.85rem;
    color: var(--color-gray-500);
    margin-bottom: 16px;
}

.wechat-qr-section .qr-image {
    width: 160px;
    height: 160px;
    margin: 0 auto 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
    background: var(--color-white);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wechat-qr-section .qr-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.wechat-qr-section .qr-placeholder {
    color: var(--color-gray-400);
    font-size: 0.75rem;
}

.wechat-qr-section .qr-hint {
    font-size: 0.75rem;
    color: var(--color-gray-400);
    letter-spacing: 0.03em;
}

/* ============================================
   11b. FAQ 折叠面板
   ============================================ */
.faq-list {
    margin-top: 40px;
}

.faq-item {
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    overflow: hidden;
    background: var(--color-white);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--color-gray-300);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-black);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.01em;
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-arrow {
    font-size: 0.6rem;
    transition: transform 0.3s ease;
    color: var(--color-gray-400);
}

.faq-item.open .faq-arrow {
    transform: rotate(180deg);
}

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

.faq-item.open .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 0.9rem;
    color: var(--color-gray-500);
    line-height: 1.8;
}

/* ============================================
   12. Footer
   ============================================ */
.footer {
    background: var(--color-black);
    color: var(--color-gray-500);
    padding: 48px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--color-gray-800);
}

.footer-section h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.footer-section h5 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.footer-section p {
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--color-gray-500);
    margin-bottom: 16px;
}

.footer-section a {
    display: block;
    font-size: 0.85rem;
    color: var(--color-gray-500);
    padding: 6px 0;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--color-primary);
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-gray-800);
    color: var(--color-gray-500);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-gray-600);
    letter-spacing: 0.03em;
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom a {
    color: var(--color-gray-500);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--color-primary);
}

/* ============================================
   13. 后台登录页
   ============================================ */
.admin-login {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-black) 50%, #1a1a2e 100%);
    padding: 20px;
}

.admin-login-box {
    width: 100%;
    max-width: 400px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 48px 40px;
}

.admin-login-box h1 {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 4px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.admin-login-box p {
    text-align: center;
    color: var(--color-gray-500);
    margin-bottom: 36px;
    font-size: 0.85rem;
}

.admin-login .form-group {
    margin-bottom: 20px;
}

.admin-login .btn {
    width: 100%;
}

.alert-error {
    padding: 14px 18px;
    background: #fdf2f2;
    color: #8b2020;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 0.85rem;
    border-left: 3px solid var(--color-error);
}

.alert-success {
    padding: 14px 18px;
    background: #f0f7f0;
    color: #2d5a2d;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 0.85rem;
    border-left: 3px solid var(--color-success);
}

/* ============================================
   14. 后台管理通用
   ============================================ */
.admin-body {
    background: var(--color-gray-100);
}

.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 240px;
    height: 100vh;
    background: var(--color-black);
    color: var(--color-white);
    z-index: 1000;
    overflow-y: auto;
}

.admin-sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--color-gray-800);
}

.admin-sidebar-nav {
    padding: 12px;
}

.admin-sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--color-gray-500);
    font-size: 0.85rem;
    transition: var(--transition);
    margin-bottom: 2px;
    letter-spacing: 0.02em;
}

.admin-sidebar-nav a:hover,
.admin-sidebar-nav a.active {
    background: var(--color-gray-800);
    color: var(--color-white);
}

.admin-main {
    margin-left: 240px;
    padding: 24px;
    min-height: 100vh;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

.admin-header h1 {
    font-size: 1.6rem;
    font-weight: 300;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.admin-table {
    width: 100%;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.admin-table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-gray-500);
    background: var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-200);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.admin-table td {
    padding: 14px 16px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-gray-100);
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.badge-active {
    display: inline-block;
    padding: 4px 14px;
    background: #f0f7f0;
    color: #2d5a2d;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.badge-inactive {
    display: inline-block;
    padding: 4px 14px;
    background: #fdf2f2;
    color: #8b2020;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

/* ============================================
   15. 响应式断点
   ============================================ */
/* 平板端（768px - 1024px） */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .admin-sidebar {
        width: 200px;
    }

    .admin-main {
        margin-left: 200px;
    }
}

/* 手机端（< 768px） */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav-desktop, .header-right {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-slider {
        min-height: 520px;
    }

    .hero-content h1 {
        font-size: 2.4rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .hero-prev, .hero-next {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .section {
        padding: 72px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

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

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

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

    .product-main-image img {
        aspect-ratio: 1 / 1;
    }

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

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

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

    .admin-sidebar {
        display: none;
    }

    .admin-main {
        margin-left: 0;
    }
}

/* 小屏手机（< 480px） */
@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 0.9rem;
    }

    .brand-slogan h2 {
        font-size: 1.2rem;
        letter-spacing: 2px;
    }

    .cta-section h2 {
        font-size: 1.6rem;
    }

    .about-hero h1,
    .products-hero h1,
    .contact-hero h1 {
        font-size: 2rem;
    }
}

/* ===== QR Code Section ===== */
.qrcode-section { margin-top: 28px; }
.qrcode-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 16px; }
.qrcode-card { text-align: center; }
.qrcode-img-wrap { width: 120px; height: 120px; margin: 0 auto 10px; border-radius: 8px; overflow: hidden; border: 1px solid #e5e7eb; background: #f9fafb; }
.qrcode-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.qrcode-label { font-size: 0.8rem; color: #374151; font-weight: 500; }
@media (max-width: 768px) {
    .qrcode-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .qrcode-img-wrap { width: 100px; height: 100px; }
}

/* ============================================
   P3: 滚动入场动画
   ============================================ */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 子元素逐个延迟 */
.fade-in-up:nth-child(1) { transition-delay: 0s; }
.fade-in-up:nth-child(2) { transition-delay: 0.1s; }
.fade-in-up:nth-child(3) { transition-delay: 0.2s; }
.fade-in-up:nth-child(4) { transition-delay: 0.3s; }
.fade-in-up:nth-child(5) { transition-delay: 0.4s; }
.fade-in-up:nth-child(6) { transition-delay: 0.5s; }

/* 尊重用户减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .fade-in-up, .fade-in-left, .fade-in-right {
        opacity: 1;
        transform: none;
        transition: none;
    }
}


/* Page hero backgrounds - mobile */
@media (max-width: 768px) {
    .about-hero,
    .products-hero,
    .contact-hero {
        background-attachment: scroll;
    }
}