:/* ============================================================
   意昂体育官方网站 - style.css
   风格：现代活力 / 渐变 / 毛玻璃 / 圆角卡片 / 响应式 + 暗色模式
   作者：AI 设计系统
   ============================================================ */

/* ---------- CSS 变量 / 主题 ---------- */
:root {
    --primary: #1a73e8;
    --primary-dark: #0d47a1;
    --primary-light: #e3f0ff;
    --accent: #ff6d00;
    --bg: #ffffff;
    --bg-secondary: #f5f7fa;
    --text: #1a1a2e;
    --text-secondary: #555;
    --border: #e0e0e0;
    --shadow: 0 8px 32px rgba(0,0,0,0.08);
    --glass: rgba(255,255,255,0.6);
    --radius: 20px;
    --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
    --bg: #0d1117;
    --bg-secondary: #161b22;
    --text: #e6edf3;
    --text-secondary: #8b949e;
    --border: #30363d;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --glass: rgba(13,17,23,0.7);
    --primary-light: #0d2137;
}

/* ---------- 基础重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
}

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

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

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

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

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ---------- 选择高亮 ---------- */
::selection {
    background: var(--primary);
    color: #fff;
}

/* ---------- Header & Nav ---------- */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--transition), background var(--transition);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text);
    padding: 6px 0;
    position: relative;
    transition: color var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}

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

.nav-links a.active {
    color: var(--primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--text);
    border-radius: 3px;
    transition: all var(--transition);
}

.dark-toggle {
    background: none;
    border: 2px solid var(--border);
    border-radius: 30px;
    padding: 6px 14px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
    transition: border-color var(--transition), background var(--transition);
}

.dark-toggle:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

/* ---------- Hero 区域 ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg) 50%, #f0e6ff 100%);
    padding: 120px 20px 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    opacity: 0.08;
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    opacity: 0.06;
    border-radius: 50%;
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 500px;
    line-height: 1.8;
}

.btn-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(26,115,232,0.25);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(26,115,232,0.35);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-visual svg {
    width: 100%;
    max-width: 480px;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.1));
    transition: transform 0.5s ease;
}

.hero-visual:hover svg {
    transform: scale(1.02) rotate(-1deg);
}

/* ---------- 通用 Section ---------- */
section {
    padding: 90px 20px;
}

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

.section-title h2 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    margin: 12px auto 0;
}

.section-title p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.05rem;
}

/* ---------- Grid 系统 ---------- */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

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

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

/* ---------- 卡片 ---------- */
.card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

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

.card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}

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

.card-icon {
    margin-bottom: 16px;
    width: 56px;
    height: 56px;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 30px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

/* ---------- Brand Story ---------- */
.brand-story {
    background: var(--bg-secondary);
}

.brand-meta {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.brand-meta-item {
    flex: 1;
    min-width: 150px;
    text-align: center;
    padding: 20px;
    background: var(--bg);
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: transform var(--transition);
}

.brand-meta-item:hover {
    transform: translateY(-4px);
}

.brand-meta-item strong {
    font-size: 2rem;
    display: block;
    color: var(--primary);
    margin-bottom: 4px;
}

/* ---------- 产品卡片 ---------- */
.product-card {
    text-align: center;
    padding: 24px;
}

.product-card svg {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    margin-bottom: 16px;
    border-radius: 12px;
    background: var(--bg);
    padding: 20px;
    transition: transform var(--transition);
}

.product-card:hover svg {
    transform: scale(1.05);
}

/* ---------- 评价卡片 ---------- */
.testimonial-card {
    position: relative;
    padding: 30px 30px 30px 40px;
}

.testimonial-card::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary);
    opacity: 0.2;
    position: absolute;
    top: 10px;
    left: 20px;
    font-family: serif;
    line-height: 1;
}

/* ---------- FAQ ---------- */
.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 18px 0;
    cursor: pointer;
    transition: background var(--transition);
}

.faq-item:hover {
    background: var(--primary-light);
    padding-left: 8px;
    padding-right: 8px;
    border-radius: 8px;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.05rem;
}

.faq-question .icon {
    font-size: 1.4rem;
    transition: transform var(--transition);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    color: var(--text-secondary);
    padding-top: 0;
}

.faq-item.active .faq-answer {
    max-height: 400px;
    padding-top: 14px;
}

.faq-item.active .faq-question .icon {
    transform: rotate(45deg);
}

/* ---------- Footer ---------- */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 20px 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.footer-col h4::after {
    content: '';
    display: block;
    width: 30px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
    margin-top: 6px;
}

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

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
}

.footer-col ul li a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 2;
}

.footer-bottom a {
    color: var(--text-secondary);
    margin: 0 8px;
}

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

/* ---------- Back to top ---------- */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

/* ---------- 滚动动画 ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 12px 0;
    flex-wrap: wrap;
}

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

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

/* ---------- 搜索遮罩 ---------- */
.search-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.search-overlay.open {
    display: flex;
}

.search-modal {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 30px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.search-modal input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text);
    transition: border-color var(--transition);
}

.search-modal input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

.search-close {
    margin-top: 16px;
    text-align: right;
}

.search-close button {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    transition: color var(--transition);
}

.search-close button:hover {
    color: var(--accent);
}

/* ---------- 数字动画 ---------- */
.num {
    display: inline-block;
    font-variant-numeric: tabular-nums;
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero p {
        margin: 0 auto 30px;
    }

    .btn-group {
        justify-content: center;
    }

    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr 1fr;
    }

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

    .section-title h2 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border);
        gap: 12px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }

    .nav-links.open {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

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

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .brand-meta {
        flex-direction: column;
    }

    section {
        padding: 60px 20px;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .card {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .hero {
        padding: 100px 16px 60px;
    }

    .nav-inner {
        padding: 10px 16px;
    }

    .logo {
        font-size: 1.3rem;
    }

    .back-top {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
        bottom: 20px;
        right: 20px;
    }

    .search-modal {
        padding: 20px;
    }
}

/* ---------- 打印样式 ---------- */
@media print {
    header,
    .back-top,
    .search-overlay,
    .hamburger,
    .dark-toggle {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .hero {
        min-height: auto;
        padding: 40px 0;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}