/* style.css - 开云电竞官网 (Kaiyun Esports) */
/* ===== Reset & Variables ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #f5f7fa;
    --bg-card: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #4a4a6a;
    --primary: #ff6b35;
    --primary-light: #ff8a5c;
    --primary-dark: #e55a2b;
    --glass: rgba(255, 255, 255, 0.7);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --radius: 20px;
    --radius-sm: 12px;
    --nav-bg: rgba(255, 255, 255, 0.85);
    --footer-bg: #0a0a1a;
    --footer-text: #c0c0d0;
    --border: rgba(0, 0, 0, 0.06);
    --gradient: linear-gradient(135deg, #1a1a3e 0%, #2a2a5e 50%, #1a1a3e 100%);
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg: #0a0a1a;
    --bg-card: #12122a;
    --text: #e0e0f0;
    --text-secondary: #a0a0c0;
    --glass: rgba(20, 20, 50, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --nav-bg: rgba(10, 10, 30, 0.9);
    --footer-bg: #050510;
    --footer-text: #8888aa;
    --border: rgba(255, 255, 255, 0.08);
}

/* ===== Base ===== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.4s, color 0.4s;
}

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

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

::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

/* ===== Header & Nav ===== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.4s;
}

nav {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 70px;
}

.nav-logo {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), #ff9a5e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    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);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle,
.search-toggle,
.menu-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition), color var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-toggle:hover,
.search-toggle:hover,
.menu-toggle:hover {
    background: var(--glass);
}

.menu-toggle {
    display: none;
}

/* ===== Search Modal ===== */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

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

.search-modal-content {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius);
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow);
}

.search-modal-content input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 18px;
    background: var(--bg);
    color: var(--text);
    outline: none;
    transition: border var(--transition);
}

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

.search-modal-content .search-results {
    margin-top: 20px;
    max-height: 300px;
    overflow-y: auto;
}

.search-modal-content .search-results a {
    display: block;
    padding: 12px;
    border-radius: 8px;
    transition: background var(--transition);
    color: var(--text);
}

.search-modal-content .search-results a:hover {
    background: var(--glass);
}

/* ===== Main & Sections ===== */
main {
    padding-top: 70px;
}

section {
    max-width: 1280px;
    margin: 0 auto;
    padding: 100px 24px;
}

.banner-section {
    max-width: 100%;
    padding: 0;
}

/* ===== Banner ===== */
.banner-wrapper {
    position: relative;
    width: 100%;
    height: 85vh;
    min-height: 600px;
    overflow: hidden;
    background: var(--gradient);
}

.banner-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease;
    padding: 0 40px;
}

.banner-slide.active {
    opacity: 1;
}

.banner-content {
    text-align: center;
    max-width: 800px;
}

.banner-content h1 {
    font-size: 64px;
    font-weight: 900;
    color: #fff;
    margin-bottom: 20px;
    line-height: 1.1;
    letter-spacing: -1px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.banner-content p {
    font-size: 22px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 36px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.banner-content .btn {
    display: inline-block;
    padding: 16px 48px;
    background: var(--primary);
    color: #fff;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
}

.banner-content .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.5);
}

.banner-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.banner-dots span {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.banner-dots span.active {
    background: var(--primary);
    transform: scale(1.3);
}

.banner-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: none;
    color: #fff;
    font-size: 32px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-arrow:hover {
    background: rgba(255, 255, 255, 0.3);
}

.banner-arrow.prev {
    left: 30px;
}

.banner-arrow.next {
    right: 30px;
}

/* ===== Section Titles ===== */
.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary), #ff9a5e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Grids ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

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

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

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--border);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    font-weight: 700;
}

.card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== Stats ===== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 30px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), #ff9a5e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    margin-top: 8px;
}

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

.testimonial-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.testimonial-card .quote {
    font-size: 16px;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 16px;
}

.testimonial-card .author {
    font-weight: 700;
}

.testimonial-card .role {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== FAQ ===== */
.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
}

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

.faq-question .icon {
    transition: transform var(--transition);
    font-size: 18px;
}

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

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

/* ===== HowTo ===== */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.howto-step {
    text-align: center;
    padding: 30px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.howto-step .step-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    margin: 0 auto 16px;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

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

.contact-info .info-item svg {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    transition: border var(--transition);
    margin-bottom: 16px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--primary);
    outline: none;
}

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

.contact-form button {
    padding: 14px 40px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}

.contact-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
}

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

.news-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform var(--transition);
}

.news-card:hover {
    transform: translateY(-4px);
}

.news-card .news-img {
    height: 200px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.news-card .news-body .date {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.news-card .news-body h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.news-card .news-body p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== Footer ===== */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 60px 24px 30px;
}

.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer h4 {
    color: #fff;
    font-size: 18px;
    margin-bottom: 20px;
}

.footer a {
    color: var(--footer-text);
    display: block;
    margin-bottom: 10px;
    font-size: 14px;
    transition: color var(--transition);
}

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

.footer .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 40px;
    padding-top: 24px;
    text-align: center;
    font-size: 14px;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition);
    z-index: 999;
}

.back-to-top.show {
    display: flex;
}

.back-to-top:hover {
    transform: scale(1.1);
}

/* ===== Scroll Animation ===== */
.scroll-animate {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 20px 24px;
    max-width: 1280px;
    margin: 0 auto;
    font-size: 14px;
    color: var(--text-secondary);
}

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

.breadcrumb span {
    margin: 0 8px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .grid-2,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .grid-4,
    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
    .banner-content h1 {
        font-size: 44px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open {
        display: flex;
    }
    .menu-toggle {
        display: flex;
    }
    .grid-3,
    .news-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
    }
    .banner-content h1 {
        font-size: 36px;
    }
    .banner-arrow {
        width: 44px;
        height: 44px;
        font-size: 22px;
    }
    .banner-arrow.prev {
        left: 12px;
    }
    .banner-arrow.next {
        right: 12px;
    }
    .stat-grid {
        grid-template-columns: 1fr 1fr;
    }
    section {
        padding: 60px 20px;
    }
    .footer-inner {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .banner-content h1 {
        font-size: 28px;
    }
    .banner-content p {
        font-size: 16px;
    }
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .stat-grid {
        grid-template-columns: 1fr;
    }
}