/* ==========================================
   PureNutra Hubs - 高端品牌展示网站样式
   Premium US Health Brand Design
   ========================================== */

/* === Google Fonts Import === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* === 变量定义 === */
:root {
    --primary: #0f1b4c;
    --primary-mid: #1a3278;
    --primary-light: #2952a3;
    --secondary: #4770db;
    --accent: #c9a227;
    --accent-light: #dbb73e;
    --accent-glow: rgba(201, 162, 39, 0.3);
    --text-dark: #0a0f2e;
    --text-body: #3d4463;
    --text-light: #6b7194;
    --text-muted: #9da2be;
    --bg-white: #ffffff;
    --bg-light: #f4f6fb;
    --bg-subtle: #eef1f9;
    --bg-dark: #060b1e;
    --bg-card: rgba(255, 255, 255, 0.85);
    --border: rgba(15, 27, 76, 0.08);
    --border-light: rgba(15, 27, 76, 0.05);
    --shadow-xs: 0 1px 3px rgba(15, 27, 76, 0.04);
    --shadow-sm: 0 4px 12px rgba(15, 27, 76, 0.06);
    --shadow-md: 0 8px 30px rgba(15, 27, 76, 0.1);
    --shadow-lg: 0 20px 60px rgba(15, 27, 76, 0.14);
    --shadow-xl: 0 30px 80px rgba(15, 27, 76, 0.18);
    --shadow-glow: 0 8px 40px rgba(71, 112, 219, 0.25);
    --shadow-gold: 0 8px 40px rgba(201, 162, 39, 0.3);
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.25s ease;
    --transition-slow: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-pill: 100px;
    --max-width: 1240px;
    --gradient-primary: linear-gradient(135deg, #0f1b4c 0%, #1a3278 30%, #2952a3 60%, #4770db 100%);
    --gradient-hero: linear-gradient(155deg, #060b1e 0%, #0f1b4c 25%, #1a3278 50%, #2952a3 75%, #4770db 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(244,246,251,0.7));
    --gradient-accent: linear-gradient(135deg, #c9a227, #dbb73e, #e8c84a);
    --gradient-dark: linear-gradient(180deg, #060b1e 0%, #0f1b4c 100%);
}

/* === 全局重置 === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-body);
    background: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--accent);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 28px;
}

/* === 滚动动画 === */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* === 跳转链接（无障碍） === */
.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    background: var(--secondary);
    color: #fff;
    padding: 14px 28px;
    border-radius: var(--radius-pill);
    z-index: 10000;
    font-size: 14px;
    font-weight: 600;
}

.skip-link:focus {
    top: 16px;
    color: #fff;
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(15, 27, 76, 0.06);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 4px 30px rgba(15, 27, 76, 0.08);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 76px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.logo a:hover {
    opacity: 0.85;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 900;
    font-size: 15px;
    letter-spacing: -0.5px;
    box-shadow: 0 4px 16px rgba(71, 112, 219, 0.3);
}

.logo-text {
    font-size: 23px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--primary);
}

.logo-text span {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 4px;
    align-items: center;
}

.nav-links a {
    color: var(--text-body);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 18px;
    border-radius: var(--radius-pill);
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a:hover {
    color: var(--primary);
    background: var(--bg-light);
}

.nav-links a.active {
    color: var(--secondary);
    background: rgba(71, 112, 219, 0.08);
    font-weight: 600;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 10px;
    background: none;
    border: none;
    z-index: 1001;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition-fast);
}

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

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

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

/* === Hero 区域 === */
.hero {
    padding: 180px 0 120px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    color: #fff;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -15%;
    width: 900px;
    height: 900px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.2) 0%, transparent 65%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(201, 162, 39, 0.1) 0%, transparent 65%);
    border-radius: 50%;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 10px) scale(1.02); }
}

/* Hero 带背景图变体 */
.hero-with-bg {
    background: none;
}

.hero-with-bg::before,
.hero-with-bg::after {
    display: none;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(6, 11, 30, 0.82) 0%,
        rgba(15, 27, 76, 0.72) 30%,
        rgba(26, 50, 120, 0.6) 60%,
        rgba(71, 112, 219, 0.45) 100%
    );
}

.hero-with-bg .container {
    position: relative;
    z-index: 2;
}

/* 装饰粒子 */
.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 760px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 10px 24px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    backdrop-filter: blur(20px);
    letter-spacing: 0.5px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--accent-glow);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 8px var(--accent-glow); transform: scale(1); }
    50% { box-shadow: 0 0 20px var(--accent-glow); transform: scale(1.2); }
}

.hero h1 {
    font-size: 58px;
    font-weight: 900;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.hero h1 .highlight {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 19px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    margin-bottom: 48px;
    max-width: 560px;
    letter-spacing: 0.01em;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* === 按钮 === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 36px;
    font-size: 15px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.4;
    min-height: 52px;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--primary);
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(201, 162, 39, 0.3);
}

.btn-primary:hover {
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 12px 36px rgba(201, 162, 39, 0.45);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
    transform: translateY(-3px);
}

.btn-secondary {
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--primary-mid);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

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

.btn-dark-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.btn-sm {
    padding: 12px 28px;
    font-size: 14px;
    min-height: 44px;
}

/* === 通用 Section === */
.section {
    padding: 120px 0;
    position: relative;
}

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

.section-dark {
    background: var(--gradient-dark);
    color: #fff;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 16px;
    padding: 6px 20px;
    background: rgba(71, 112, 219, 0.08);
    border-radius: var(--radius-pill);
}

.section-header h2 {
    font-size: 42px;
    font-weight: 900;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.section-header p {
    font-size: 17px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-dark .section-tag {
    color: var(--accent-light);
    background: rgba(201, 162, 39, 0.15);
}

.section-dark .section-header h2 {
    color: #fff;
}

.section-dark .section-header p {
    color: rgba(255, 255, 255, 0.65);
}

/* === 品牌优势模块 === */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.advantage-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 44px 36px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

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

.advantage-card:hover::before {
    opacity: 1;
}

.advantage-icon {
    width: 72px;
    height: 72px;
    background: var(--gradient-primary);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 30px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(71, 112, 219, 0.25);
    transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
    transform: scale(1.08);
    box-shadow: 0 12px 32px rgba(71, 112, 219, 0.35);
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.advantage-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

/* === 产品卡片 === */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
}

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

.product-image {
    position: relative;
    height: 300px;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-subtle) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to top, var(--bg-white), transparent);
    z-index: 1;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.product-card:hover .product-image img {
    transform: scale(1.06);
}

.product-image .placeholder-text {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    padding: 20px;
}

.product-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--gradient-accent);
    color: var(--primary);
    padding: 7px 18px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    z-index: 2;
    box-shadow: 0 4px 16px rgba(201, 162, 39, 0.3);
}

.product-info {
    padding: 32px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-name {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.product-name-en {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-style: italic;
    font-weight: 400;
}

.product-desc {
    font-size: 15px;
    color: var(--text-body);
    line-height: 1.75;
    margin-bottom: 20px;
    flex: 1;
}

.product-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 28px;
}

.product-highlights span {
    background: rgba(71, 112, 219, 0.06);
    color: var(--secondary);
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.01em;
    border: 1px solid rgba(71, 112, 219, 0.1);
}

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

/* === 产品详情页 === */
.product-detail-hero {
    padding: 140px 0 100px;
    background: var(--gradient-hero);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.product-detail-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.15) 0%, transparent 65%);
    border-radius: 50%;
}

.product-detail-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 72px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.product-detail-image {
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-xl);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 420px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
}

.product-detail-image img {
    max-height: 380px;
    object-fit: contain;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
}

.product-detail-info h1 {
    color: #fff;
    font-size: 46px;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.product-detail-info .product-name-en {
    color: rgba(255, 255, 255, 0.5);
    font-size: 15px;
    margin-bottom: 28px;
}

.product-detail-info .product-positioning {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.85;
    margin-bottom: 36px;
}

.product-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 36px;
}

.product-detail-tags span {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.9);
    padding: 9px 22px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

/* 产品详情内容区 */
.product-detail-content {
    padding: 100px 0;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.detail-block {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 44px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.detail-block:hover {
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.detail-block.full-width {
    grid-column: 1 / -1;
}

.detail-block h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 14px;
    letter-spacing: -0.01em;
}

.detail-block h3 .icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(71, 112, 219, 0.2);
}

.detail-block ul {
    list-style: none;
    padding: 0;
}

.detail-block ul li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    font-size: 15px;
    line-height: 1.75;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-body);
}

.detail-block ul li:last-child {
    border-bottom: none;
}

.detail-block ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 18px;
    width: 8px;
    height: 8px;
    background: var(--gradient-accent);
    border-radius: 50%;
}

.detail-block p {
    font-size: 15px;
    line-height: 1.85;
    color: var(--text-body);
}

/* 成分表 */
.ingredient-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 16px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.ingredient-table th,
.ingredient-table td {
    padding: 16px 24px;
    text-align: left;
    font-size: 15px;
}

.ingredient-table th {
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.ingredient-table td {
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-white);
}

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

.ingredient-table tr:hover td {
    background: var(--bg-light);
}

/* === 品牌理念模块 === */
.philosophy-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.philosophy-text h2 {
    font-size: 40px;
    margin-bottom: 28px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.philosophy-text p {
    font-size: 16px;
    line-height: 1.85;
    margin-bottom: 18px;
    color: var(--text-body);
}

.philosophy-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 28px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.stat-number {
    font-size: 40px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 6px;
    font-weight: 500;
}

.philosophy-image {
    background: linear-gradient(135deg, var(--bg-light), var(--bg-subtle));
    border-radius: var(--radius-xl);
    min-height: 480px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border);
}

.philosophy-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* === 使用注意事项 === */
.notice-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.notice-item {
    display: flex;
    gap: 20px;
    padding: 32px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.notice-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(71, 112, 219, 0.2);
}

.notice-item h4 {
    font-size: 17px;
    margin-bottom: 8px;
    font-weight: 700;
}

.notice-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.75;
}

/* === FAQ 模块 === */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 14px;
    overflow: hidden;
    transition: var(--transition);
    background: var(--bg-white);
}

.faq-item:hover {
    border-color: rgba(71, 112, 219, 0.2);
    box-shadow: var(--shadow-sm);
}

.faq-item.active {
    border-color: rgba(71, 112, 219, 0.3);
    box-shadow: var(--shadow-md);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    cursor: pointer;
    background: var(--bg-white);
    transition: var(--transition-fast);
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
}

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

.faq-question h3 {
    font-size: 16px;
    font-weight: 600;
    flex: 1;
    padding-right: 20px;
    letter-spacing: -0.01em;
}

.faq-toggle {
    width: 36px;
    height: 36px;
    background: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--secondary);
    flex-shrink: 0;
    transition: var(--transition);
    font-weight: 300;
}

.faq-item.active .faq-toggle {
    background: var(--secondary);
    color: #fff;
    transform: rotate(45deg);
    box-shadow: 0 4px 12px rgba(71, 112, 219, 0.3);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.faq-answer-inner {
    padding: 0 32px 28px;
    font-size: 15px;
    line-height: 1.85;
    color: var(--text-body);
}

/* === FAQ 页面分类标题 === */
.faq-category {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    margin-top: 48px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--secondary);
    display: inline-block;
}

.faq-category:first-of-type {
    margin-top: 0;
}

/* === 使用指南页 === */
.guide-steps {
    max-width: 820px;
    margin: 0 auto;
}

.guide-step {
    display: flex;
    gap: 28px;
    padding: 36px 0;
    border-bottom: 1px solid var(--border-light);
}

.guide-step:last-child {
    border-bottom: none;
}

.step-number {
    width: 52px;
    height: 52px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(71, 112, 219, 0.25);
}

.step-content h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.step-content p {
    font-size: 15px;
    line-height: 1.85;
    color: var(--text-body);
}

/* === 关于页面 === */
.about-hero {
    padding: 160px 0 100px;
    background: var(--gradient-hero);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.about-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.15) 0%, transparent 65%);
    border-radius: 50%;
}

.about-hero h1 {
    font-size: 50px;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    position: relative;
    z-index: 2;
}

.about-hero p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    line-height: 1.7;
}

.about-content {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 72px;
    align-items: center;
    margin-bottom: 72px;
}

.about-text h2 {
    font-size: 34px;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.about-text p {
    font-size: 16px;
    line-height: 1.85;
    margin-bottom: 18px;
    color: var(--text-body);
}

.about-image {
    background: linear-gradient(135deg, var(--bg-light), var(--bg-subtle));
    border-radius: var(--radius-xl);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 72px;
}

.value-card {
    text-align: center;
    padding: 40px 28px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
}

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

.value-card:hover::before {
    opacity: 1;
}

.value-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 26px;
    color: #fff;
    box-shadow: 0 6px 20px rgba(71, 112, 219, 0.25);
}

.value-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.value-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.75;
}

/* === 联系页面 === */
.contact-hero {
    padding: 160px 0 100px;
    background: var(--gradient-hero);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.15) 0%, transparent 65%);
    border-radius: 50%;
}

.contact-hero h1 {
    font-size: 50px;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    position: relative;
    z-index: 2;
}

.contact-hero p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.contact-content {
    padding: 100px 0;
}

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

.contact-form {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 48px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.contact-form h3 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 28px;
    letter-spacing: -0.02em;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 16px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition-fast);
    background: var(--bg-light);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 4px rgba(71, 112, 219, 0.1);
    background: var(--bg-white);
}

.form-group textarea {
    resize: vertical;
    min-height: 130px;
}

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

.contact-card {
    display: flex;
    gap: 20px;
    padding: 32px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    align-items: flex-start;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.contact-card-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(71, 112, 219, 0.2);
}

.contact-card h4 {
    font-size: 17px;
    margin-bottom: 6px;
    font-weight: 700;
}

.contact-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.75;
}

.contact-card a {
    color: var(--secondary);
    font-weight: 500;
}

/* === 免责声明 === */
.disclaimer {
    background: var(--bg-light);
    padding: 48px 0;
    border-top: 1px solid var(--border-light);
}

.disclaimer-content {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}

.disclaimer-content p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.85;
}

.disclaimer-content strong {
    color: var(--text-light);
}

/* === CTA 横幅 === */
.cta-banner {
    padding: 100px 0;
    background: var(--gradient-hero);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(201, 162, 39, 0.1) 0%, transparent 65%);
    border-radius: 50%;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -40%;
    right: -15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.15) 0%, transparent 65%);
    border-radius: 50%;
}

.cta-banner .container {
    position: relative;
    z-index: 2;
}

.cta-banner h2 {
    font-size: 40px;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
}

.cta-banner p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === 页脚 === */
footer {
    background: var(--gradient-dark);
    color: #fff;
    padding: 4rem 0 1.5rem;
    margin-top: 0;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(71, 112, 219, 0.3), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 1.2rem;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.85;
    font-size: 14px;
}

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

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: var(--transition-fast);
    display: inline-block;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
    font-size: 14px;
}

.footer-partner {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-partner a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition-fast);
    font-weight: 500;
}

.footer-partner a:hover {
    color: var(--accent-light);
}

/* === 页面 Hero（通用子页面） === */
.page-hero {
    padding: 160px 0 100px;
    background: var(--gradient-hero);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(71, 112, 219, 0.15) 0%, transparent 65%);
    border-radius: 50%;
}

.page-hero h1 {
    font-size: 50px;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    position: relative;
    z-index: 2;
}

.page-hero p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    line-height: 1.7;
}

/* === 面包屑导航 === */
.breadcrumb {
    padding: 18px 0;
    font-size: 14px;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-muted);
    font-weight: 500;
}

.breadcrumb a:hover {
    color: var(--secondary);
}

.breadcrumb span {
    margin: 0 10px;
    color: var(--border);
}

/* === 产品中心页 产品列表 === */
.products-list {
    padding: 100px 0;
}

.product-list-card {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 56px;
    align-items: center;
    padding: 48px;
    margin-bottom: 48px;
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: var(--transition);
    overflow: hidden;
}

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

.product-list-card:nth-child(even) {
    direction: rtl;
}

.product-list-card:nth-child(even) > * {
    direction: ltr;
}

.product-list-image {
    background: linear-gradient(135deg, var(--bg-light), var(--bg-subtle));
    border-radius: var(--radius-lg);
    height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.product-list-card:hover .product-list-image img {
    transform: scale(1.05);
}

.product-list-info h3 {
    font-size: 30px;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.product-list-info .product-name-en {
    font-size: 14px;
    margin-bottom: 20px;
}

.product-list-info .product-desc {
    margin-bottom: 24px;
    line-height: 1.8;
}

.product-list-info .product-highlights {
    margin-bottom: 32px;
}

/* === 安全提示横幅 === */
.safety-banner {
    background: linear-gradient(135deg, #FFFBEB, #FFF8E1);
    border: 1px solid rgba(201, 162, 39, 0.25);
    border-radius: var(--radius-lg);
    padding: 32px 36px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin: 48px 0;
}

.safety-banner-icon {
    font-size: 28px;
    flex-shrink: 0;
    line-height: 1;
}

.safety-banner h4 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #7c5e00;
    font-weight: 700;
}

.safety-banner p {
    font-size: 14px;
    color: #9a7d1f;
    line-height: 1.8;
}

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

/* 平板 */
@media (max-width: 1024px) {
    .hero {
        min-height: auto;
        padding: 140px 0 80px;
    }

    .hero h1 {
        font-size: 42px;
    }

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

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

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

    .product-detail-layout {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .product-detail-image {
        min-height: 320px;
    }

    .detail-grid {
        gap: 24px;
    }

    .product-list-card {
        grid-template-columns: 1fr;
        padding: 36px;
    }

    .product-list-card:nth-child(even) {
        direction: ltr;
    }

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

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

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

    .section-header h2 {
        font-size: 36px;
    }
}

/* 手机 */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 340px;
        height: 100vh;
        background: var(--bg-white);
        flex-direction: column;
        padding: 100px 28px 40px;
        box-shadow: var(--shadow-xl);
        transition: right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        z-index: 999;
        gap: 4px;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        font-size: 17px;
        padding: 16px 24px;
        width: 100%;
        border-radius: var(--radius-md);
    }

    .hamburger {
        display: flex;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(6, 11, 30, 0.6);
        z-index: 998;
        backdrop-filter: blur(4px);
    }

    .nav-overlay.active {
        display: block;
    }

    .hero {
        padding: 140px 0 80px;
        min-height: auto;
    }

    .hero h1 {
        font-size: 34px;
        letter-spacing: -0.02em;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
        text-align: center;
    }

    .section {
        padding: 80px 0;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .section-header h2 {
        font-size: 30px;
    }

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

    .advantage-card {
        padding: 32px 28px;
    }

    .products-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .product-image {
        height: 240px;
    }

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

    .philosophy-stats {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .stat-number {
        font-size: 32px;
    }

    .philosophy-image {
        min-height: 320px;
    }

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

    .product-detail-info h1 {
        font-size: 32px;
    }

    .product-detail-image {
        padding: 32px;
        min-height: 280px;
    }

    .page-hero h1,
    .about-hero h1,
    .contact-hero h1 {
        font-size: 34px;
    }

    .page-hero,
    .about-hero,
    .contact-hero {
        padding: 140px 0 80px;
    }

    .product-list-image {
        height: 260px;
    }

    .product-list-info h3 {
        font-size: 24px;
    }

    .values-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .safety-banner {
        flex-direction: column;
    }

    .cta-banner {
        padding: 80px 0;
    }

    .cta-banner h2 {
        font-size: 30px;
    }

    .cta-banner p {
        font-size: 16px;
    }

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

    .contact-form {
        padding: 36px 28px;
    }

    .detail-block {
        padding: 32px 24px;
    }

    .guide-step {
        gap: 20px;
    }

    .step-number {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .container {
        padding: 0 18px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero-badge {
        font-size: 13px;
        padding: 8px 18px;
    }

    .section {
        padding: 64px 0;
    }

    .section-header h2 {
        font-size: 26px;
    }

    .section-tag {
        font-size: 11px;
        letter-spacing: 2px;
    }

    .advantage-card {
        padding: 28px 22px;
    }

    .advantage-icon {
        width: 60px;
        height: 60px;
        font-size: 26px;
    }

    .product-info {
        padding: 24px;
    }

    .product-name {
        font-size: 20px;
    }

    .detail-block {
        padding: 28px 20px;
    }

    .contact-form {
        padding: 28px 20px;
    }

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

    .cta-banner h2 {
        font-size: 26px;
    }

    .product-detail-info h1 {
        font-size: 28px;
    }

    .product-list-info h3 {
        font-size: 22px;
    }

    .faq-question {
        padding: 20px;
    }

    .faq-answer-inner {
        padding: 0 20px 24px;
    }
}