/* ===== 熊猫体育 PANDA SPORTS 完整样式表 ===== */
/* 重置与基础 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #FF6B35;
    --primary-dark: #e55a2b;
    --secondary: #1a1a2e;
    --accent: #16213e;
    --bg: #f8f9fa;
    --bg-card: #ffffff;
    --text: #2d3436;
    --text-light: #636e72;
    --glass: rgba(255, 255, 255, 0.85);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --radius: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark {
    --bg: #0f0f23;
    --bg-card: #1a1a2e;
    --text: #e0e0e0;
    --text-light: #a0a0b0;
    --glass: rgba(26, 26, 46, 0.9);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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: 1.7;
    transition: var(--transition);
}

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

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

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

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

.section-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), #ff8a50);
    color: #fff;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

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

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.glass-card {
    background: var(--glass);
    backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

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

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

@media (max-width: 992px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .section-title {
        font-size: 1.6rem;
    }
}

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

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

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
    align-items: center;
}

nav a {
    color: var(--text);
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

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

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

.nav-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg);
    border-radius: 50px;
    padding: 5px 15px;
    border: 1px solid #ddd;
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px;
    outline: none;
    width: 150px;
    color: var(--text);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
}

.dark-toggle,
.menu-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text);
    padding: 5px;
}

.menu-toggle {
    display: none;
}

@media (max-width: 992px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--glass);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 15px;
    }
    nav ul.open {
        display: flex;
    }
    .menu-toggle {
        display: block;
    }
    .search-box input {
        width: 100px;
    }
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 50%, #0f3460 100%);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 138, 80, 0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-30px);
    }
}

.hero-content {
    text-align: center;
    color: #fff;
    z-index: 1;
    padding: 40px 20px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--primary), #ffd700);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero p {
        font-size: 1.1rem;
    }
}

/* 面包屑 */
.breadcrumb {
    background: var(--bg);
    padding: 15px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.breadcrumb ul {
    list-style: none;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.breadcrumb li {
    color: var(--text-light);
    font-size: 0.9rem;
}

.breadcrumb li+li::before {
    content: '/';
    margin-right: 10px;
    color: #ccc;
}

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

/* 通用section */
section {
    padding: 80px 0;
}

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

.section-dark .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

/* 轮播 */
.carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
}

.carousel-inner {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-item {
    min-width: 100%;
    padding: 20px;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    z-index: 2;
}

.carousel-btn.prev {
    left: 10px;
}

.carousel-btn.next {
    right: 10px;
}

/* 文章卡片 */
.article-card {
    padding: 20px;
}

.article-card img {
    border-radius: 12px;
    margin-bottom: 15px;
}

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

.article-card .meta {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 10px;
    display: flex;
    gap: 15px;
}

.article-card p {
    color: var(--text-light);
    margin-bottom: 15px;
}

/* FAQ */
.faq-item {
    border-bottom: 1px solid #eee;
    padding: 15px 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
}

.faq-question .icon {
    transition: transform 0.3s;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    padding-top: 0;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding-top: 15px;
}

/* HowTo */
.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    align-items: flex-start;
}

.howto-step .num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

/* 联系方式 */
.contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 底部 */
footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

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

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
}

.footer-bottom .links {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

/* 返回顶部 */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
    z-index: 999;
    display: none;
    align-items: center;
    justify-content: center;
}

.back-top.visible {
    display: flex;
}

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

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

/* 数字 */
.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
}

/* 暗黑模式适配 */
body.dark .search-box {
    border-color: #333;
}

body.dark .breadcrumb {
    background: #1a1a2e;
    border-color: #333;
}

body.dark .faq-item {
    border-color: #333;
}

/* 图片占位 */
.img-placeholder {
    background: linear-gradient(135deg, #e0e0e0, #f0f0f0);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: #999;
    font-size: 0.9rem;
}

body.dark .img-placeholder {
    background: linear-gradient(135deg, #2a2a3e, #3a3a4e);
    color: #666;
}

/* 响应式调整 */
@media (max-width: 768px) {
    section {
        padding: 50px 0;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}