/* ============================================
   Style.css - 必一运动(中国)官方网站-BSports
   包含：毛玻璃、渐变、圆角、暗色模式、响应式、动画
   ============================================ */

/* ---------- 基础重置与变量 ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
    --bg: #f5f7fa;
    --text: #1a1a2e;
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(255, 255, 255, 0.3);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --primary: #1a1a2e;
    --accent: #f0c040;
    --accent2: #e94560;
    --gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --glass: rgba(255, 255, 255, 0.18);
    --glass-border: rgba(255, 255, 255, 0.25);
    --radius: 20px;
    --radius-sm: 12px;
    --max-w: 1200px;
    --nav-h: 70px;
}

body.dark {
    --bg: #0f0f1a;
    --text: #e0e0e0;
    --card-bg: rgba(30, 30, 50, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glass: rgba(20, 20, 40, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

a:hover {
    opacity: 0.8;
}

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

.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--accent);
    color: var(--primary);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(240, 192, 64, 0.3);
}

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

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

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2.4rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.section-title p {
    font-size: 1.1rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

.grid {
    display: grid;
    gap: 32px;
}

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

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .section { padding: 48px 0; }
    .section-title h2 { font-size: 1.8rem; }
}

/* ---------- Header ---------- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    height: var(--nav-h);
    transition: background 0.3s;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text);
}

.logo svg {
    width: 40px;
    height: 40px;
}

.nav {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav a {
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s;
}

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--text);
    border-radius: 4px;
    transition: all 0.3s;
}

.dark-toggle {
    background: none;
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
    color: var(--text);
}

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

@media (max-width: 768px) {
    .nav {
        display: none;
        position: fixed;
        top: var(--nav-h);
        left: 0;
        width: 100%;
        background: var(--card-bg);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--glass-border);
    }
    .nav.open { display: flex; }
    .hamburger { display: flex; }
}

/* ---------- Hero ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    padding-top: var(--nav-h);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 50%, rgba(240, 192, 64, 0.15) 0%, transparent 60%),
                radial-gradient(circle at 80% 20%, rgba(233, 69, 96, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 80px 24px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    color: #fff;
}

.hero h1 span {
    background: linear-gradient(135deg, #f0c040, #e94560);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 36px;
    max-width: 600px;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(240, 192, 64, 0.2);
    border: 1px solid rgba(240, 192, 64, 0.3);
    border-radius: 50px;
    padding: 6px 16px;
    font-size: 0.85rem;
    color: #f0c040;
    margin-bottom: 20px;
}

.hero .stats {
    display: flex;
    gap: 48px;
    margin-top: 48px;
    flex-wrap: wrap;
}

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

.hero .stat-item .num {
    font-size: 2.4rem;
    font-weight: 800;
    color: #f0c040;
}

.hero .stat-item .label {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; }
    .hero .stats { gap: 24px; }
}

/* ---------- Banner Carousel ---------- */
.banner-carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 40px 0;
}

.banner-slide {
    display: none;
    padding: 60px 40px;
    background: var(--gradient);
    border-radius: var(--radius);
    min-height: 300px;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.banner-slide.active {
    display: flex;
    animation: fadeIn 0.6s ease;
}

.banner-slide h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.banner-slide p {
    max-width: 500px;
    opacity: 0.8;
}

.banner-dots {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
}

.banner-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--glass-border);
    cursor: pointer;
    transition: all 0.3s;
}

.banner-dots span.active {
    background: var(--accent);
    width: 32px;
    border-radius: 6px;
}

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

/* ---------- About ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 16px;
    opacity: 0.8;
}

.about-image svg {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    background: var(--gradient);
    padding: 40px;
}

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

/* ---------- Products ---------- */
.products-grid .product-card {
    text-align: center;
    padding: 40px 24px;
}

.products-grid .product-card svg {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 16px;
    padding: 16px;
    background: var(--glass);
}

.products-grid .product-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.products-grid .product-card p {
    opacity: 0.7;
    font-size: 0.95rem;
}

/* ---------- Features ---------- */
.features-grid .feature-card {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.features-grid .feature-card svg {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    border-radius: 12px;
    padding: 10px;
    background: var(--glass);
}

.features-grid .feature-card h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.features-grid .feature-card p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* ---------- Testimonials ---------- */
.testimonials-grid .testimonial-card {
    text-align: center;
}

.testimonials-grid .testimonial-card .avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: 0 auto 16px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #fff;
}

.testimonials-grid .testimonial-card .name {
    font-weight: 700;
    margin-bottom: 4px;
}

.testimonials-grid .testimonial-card .role {
    opacity: 0.6;
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.testimonials-grid .testimonial-card p {
    opacity: 0.8;
    font-style: italic;
}

/* ---------- FAQ ---------- */
.faq-item {
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 0;
    cursor: pointer;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.05rem;
    padding: 8px 0;
}

.faq-question .icon {
    font-size: 1.4rem;
    transition: transform 0.3s;
    color: var(--accent);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.4s;
    opacity: 0;
    padding: 0 16px;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    opacity: 1;
    padding: 12px 16px 16px;
}

/* ---------- HowTo ---------- */
.howto-steps .step {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
    align-items: flex-start;
}

.howto-steps .step .num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    flex-shrink: 0;
    font-size: 1.1rem;
}

.howto-steps .step h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.howto-steps .step p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* ---------- News ---------- */
.news-grid .news-card {
    padding: 24px;
}

.news-card .date {
    font-size: 0.85rem;
    opacity: 0.5;
    margin-bottom: 8px;
}

.news-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.news-card p {
    opacity: 0.7;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.news-card .read-more {
    font-weight: 600;
    color: var(--accent);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.3s;
}

.news-card .read-more:hover {
    gap: 12px;
}

/* ---------- Clients ---------- */
.clients-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: center;
    align-items: center;
}

.clients-grid svg {
    width: 100px;
    height: 60px;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.clients-grid svg:hover {
    opacity: 1;
}

/* ---------- Contact ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info h3 {
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    opacity: 0.8;
}

.contact-info svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.contact-qr {
    display: flex;
    gap: 24px;
    margin-top: 24px;
}

.contact-qr .qr-item {
    text-align: center;
}

.contact-qr .qr-item svg {
    width: 120px;
    height: 120px;
    border-radius: 12px;
    background: var(--glass);
    padding: 12px;
    margin-bottom: 8px;
}

.contact-qr .qr-item span {
    font-size: 0.85rem;
    opacity: 0.7;
}

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

/* ---------- Footer ---------- */
.footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 48px 0 24px;
    margin-top: 80px;
}

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

.footer h4 {
    color: #fff;
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.footer a {
    color: rgba(255, 255, 255, 0.6);
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

.footer p {
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    opacity: 0.6;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    display: inline;
    margin: 0 8px;
}

/* ---------- Back to Top ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--primary);
    border: none;
    cursor: pointer;
    font-size: 1.4rem;
    box-shadow: 0 8px 24px rgba(240, 192, 64, 0.3);
    transition: all 0.3s;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

/* ---------- Search Modal ---------- */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

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

.search-modal .search-box {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 32px;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow);
}

.search-modal input {
    width: 100%;
    padding: 14px 20px;
    border-radius: 50px;
    border: 2px solid var(--glass-border);
    background: var(--glass);
    color: var(--text);
    font-size: 1rem;
    outline: none;
    transition: border 0.3s;
}

.search-modal input:focus {
    border-color: var(--accent);
}

.search-modal .search-results {
    margin-top: 16px;
    max-height: 300px;
    overflow-y: auto;
}

.search-modal .search-results div {
    padding: 12px 0;
    border-bottom: 1px solid var(--glass-border);
    cursor: pointer;
}

.search-modal .search-results div:hover {
    color: var(--accent);
}

.search-modal .close-search {
    display: block;
    margin-top: 16px;
    text-align: center;
    cursor: pointer;
    opacity: 0.6;
}

/* ---------- Scroll Reveal ---------- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.6s ease;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.stat-number {
    display: inline-block;
}