/* ============================
   biubiu高校电竞 - 样式表
   主KV色: #00C8FF / #0A84FF
   ============================ */

/* ---------- 基础变量 ---------- */
:root {
    --blue-50: #E6F7FF;
    --blue-100: #BAE7FF;
    --blue-200: #91D5FF;
    --blue-300: #69C0FF;
    --blue-400: #40A9FF;
    --blue-500: #00C8FF;
    --blue-600: #0A84FF;
    --blue-700: #096DD9;
    --blue-800: #003A8C;
    --blue-900: #002766;

    --dark-50: #F5F6FA;
    --dark-100: #E8EAF0;
    --dark-200: #C4C8D4;
    --dark-300: #9BA2B5;
    --dark-400: #6B7394;
    --dark-500: #3D4468;
    --dark-600: #2A2E4A;
    --dark-700: #1A1D33;
    --dark-800: #0F1122;
    --dark-900: #080A18;

    --gold: #FFD700;
    --gold-warm: #FFAA00;
    --white: #FFFFFF;
    --transparent: transparent;

    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter', 'Noto Sans SC', sans-serif;

    --section-py: 72px;
    --container-max: 1200px;
    --nav-height: 72px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.18);
    --shadow-glow: 0 0 40px rgba(0,200,255,0.15);

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--dark-700);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { border: none; background: none; cursor: pointer; font: inherit; color: inherit; }
ul, ol { list-style: none; }

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

/* ---------- Section rhythm & transitions ---------- */
.section + .section { position: relative; }
.section + .section::before {
    content: '';
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 60px; height: 3px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    border-radius: 2px;
    z-index: 1;
}

.section-brand + .section-ambassador::before,
.section-college-events + .section-features::before,
.section-features + .section-contact::before {
    display: none;
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: rgba(8, 10, 24, 0.85);
    backdrop-filter: blur(20px) saturate(1.5);
    -webkit-backdrop-filter: blur(20px) saturate(1.5);
    border-bottom: 1px solid rgba(0, 200, 255, 0.08);
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    background: rgba(8, 10, 24, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.nav-logo-img {
    height: 36px;
    width: auto;
}

.nav-logo-divider {
    width: 1px;
    height: 28px;
    background: rgba(255,255,255,0.15);
    border-radius: 1px;
}

.nav-logo-sub {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 800;
    color: var(--white);
    letter-spacing: 2px;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--white);
    background: rgba(255,255,255,0.06);
}

.nav-link.active {
    color: var(--blue-400);
}

.nav-link-cta {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
    color: var(--white) !important;
    font-weight: 600;
    margin-left: 8px;
}

.nav-link-cta:hover {
    background: linear-gradient(135deg, var(--blue-400), var(--blue-500));
    box-shadow: 0 4px 16px rgba(0, 200, 255, 0.3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- Section rhythm & transitions ---------- */
.section {
    padding: var(--section-py) 0;
    position: relative;
}

.section:first-of-type {
    padding-top: calc(var(--section-py) * 0.5 + var(--nav-height));
}

.section + .section { position: relative; }
.section + .section::before {
    content: '';
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 60px; height: 3px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    border-radius: 2px;
    z-index: 1;
}

.section-brand + .section-ambassador::before,
.section-college-events + .section-features::before,
.section-features + .section-contact::before {
    display: none;
}

/* ---------- 通用Section ---------- */

.section-header {
    text-align: center;
    margin-bottom: 28px;
}

.section-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--blue-500);
    margin-bottom: 10px;
    position: relative;
    padding-left: 0;
}

.section-tag::before {
    display: none;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 12px;
}

.section-line {
    display: none;
}

/* 暗色section */
.section-philosophy,
.section-features {
    background: var(--dark-900);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.section-philosophy::before,
.section-features::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,200,255,0.2), transparent);
}

.section-philosophy::after,
.section-features::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,200,255,0.04), transparent 70%);
    pointer-events: none;
}

.section-philosophy::after { top: -200px; right: -200px; }
.section-features::after { bottom: -200px; left: -200px; }

/* 高校赛事 - 使用稍有不同的深蓝背景，与相邻section区分 */
.section-college-events {
    background: linear-gradient(180deg, #0a0f2e 0%, #0c1235 50%, #0a0f2e 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.section-college-events::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,200,255,0.15), transparent);
}

.section-college-events::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,200,255,0.04), transparent 70%);
    top: -150px; left: 50%; transform: translateX(-50%);
    pointer-events: none;
}

.section-philosophy .section-tag::before,
.section-features .section-tag::before,
.section-college-events .section-tag::before,
.section-pro-events .section-tag::before {
    background: linear-gradient(90deg, var(--blue-400), var(--blue-600));
}

.section-philosophy .section-title,
.section-features .section-title,
.section-college-events .section-title {
    color: var(--white);
}

.section-philosophy .section-line,
.section-features .section-line,
.section-college-events .section-line {
    background: linear-gradient(90deg, var(--blue-400), var(--blue-600));
}

/* 亮色section */
.section-brand {
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.section-brand::before {
    content: '';
    position: absolute;
    top: -300px; right: -300px;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,200,255,0.04), transparent 70%);
    pointer-events: none;
}

.section-contact {
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.section-contact::before {
    content: '';
    position: absolute;
    bottom: -300px; left: -200px;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,200,255,0.03), transparent 70%);
    pointer-events: none;
}

.section-ambassador {
    background: var(--dark-50);
    position: relative;
    overflow: hidden;
}

.section-ambassador::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,200,255,0.1), transparent);
}

/* ---------- 品牌介绍 ---------- */
.brand-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: stretch;
}

.brand-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
    justify-content: space-between;
}

.brand-right {
    position: sticky;
    top: 80px;
    display: flex;
    flex-direction: column;
}

.brand-text {
    text-align: left;
}

.brand-lead {
    font-size: 19px;
    font-weight: 700;
    color: var(--dark-800);
    margin-bottom: 16px;
    line-height: 1.5;
    position: relative;
}

.brand-lead::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    border-radius: 2px;
    margin: 20px 0 0;
}

.brand-desc {
    font-size: 14px;
    color: var(--dark-500);
    margin-bottom: 10px;
    line-height: 1.8;
}

/* ---------- 品牌介绍 - 赛事合作 ---------- */
.brand-partners {
    padding-top: 8px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.brand-partners-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--dark-300);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.brand-partners .pro-events-badges {
    flex-direction: column;
    gap: 12px;
    background: none;
    border-radius: 0;
    overflow: visible;
    border: none;
    box-shadow: none;
}

.brand-partners .pro-badge {
    background: linear-gradient(135deg, #0a1628, #0d2040);
    border: 1px solid rgba(0,200,255,0.12);
    box-shadow: 0 4px 20px rgba(0,0,0,0.25);
    padding: 0 24px;
    height: 80px;
    justify-content: flex-start;
    align-items: center;
    gap: 0;
    flex: none;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.brand-partners .pro-badge + .pro-badge::before {
    display: none;
}

.brand-partners .pro-badge.pro-badge-dark {
    background: linear-gradient(135deg, #141414, #1e1e1e);
}

.brand-partners .pro-badge:hover {
    border-color: rgba(0,200,255,0.3);
    box-shadow: 0 6px 24px rgba(0,200,255,0.12);
    transform: translateY(-2px);
    background: linear-gradient(135deg, #0d1f3a, #102240);
}

.brand-partners .pro-badge img {
    width: auto;
    height: 70%;
    max-height: 52px;
    flex-shrink: 0;
    object-fit: contain;
    object-position: left center;
    filter: brightness(1.2) contrast(1.1);
    transition: filter 0.2s ease, transform 0.2s ease;
}

/* EWC浅灰logo提亮 */
.brand-partners .pro-badge:last-child img {
    filter: brightness(2.5) contrast(0.9);
}

.brand-partners .pro-badge:hover img {
    filter: brightness(1.5);
    transform: scale(1.05);
}

.brand-partners .pro-badge:last-child:hover img {
    filter: brightness(3);
    transform: scale(1.05);
}

.brand-partners .pro-badge-text {
    color: rgba(255,255,255,0.85);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.brand-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.brand-highlight-card {
    padding: 40px 32px;
    background: var(--white);
    border: 1px solid var(--dark-100);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.brand-highlight-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.brand-highlight-card:hover {
    border-color: var(--blue-200);
    box-shadow: var(--shadow-md), 0 0 0 1px rgba(0, 200, 255, 0.08);
    transform: translateY(-4px);
}

.brand-highlight-card:hover::before {
    opacity: 1;
}

.brand-highlight-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(0,200,255,0.08), rgba(10,132,255,0.08));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-600);
}

.brand-highlight-icon svg {
    width: 28px;
    height: 28px;
}

.brand-highlight-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-800);
    margin-bottom: 8px;
}

.brand-highlight-desc {
    font-size: 14px;
    color: var(--dark-400);
}

/* ---------- 高校电竞理念 ---------- */
.philosophy-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.philosophy-main {
    padding-right: 20px;
}

.philosophy-icon-row {
    display: flex;
    gap: 40px;
    margin-bottom: 48px;
}

.philosophy-icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.philosophy-icon {
    width: 84px;
    height: 84px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(0,200,255,0.1), rgba(10,132,255,0.06));
    border: 1.5px solid rgba(0,200,255,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-400);
    box-shadow: 0 4px 20px rgba(0,200,255,0.08), inset 0 1px 0 rgba(255,255,255,0.05);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.philosophy-icon-item:hover .philosophy-icon {
    transform: translateY(-4px) scale(1.05);
    border-color: rgba(0,200,255,0.5);
    box-shadow: 0 8px 32px rgba(0,200,255,0.18), inset 0 1px 0 rgba(255,255,255,0.1);
    color: var(--blue-300);
}

.philosophy-icon svg {
    width: 40px;
    height: 40px;
}

.philosophy-icon-item span {
    font-size: 16px;
    color: rgba(255,255,255,0.75);
    font-weight: 700;
    letter-spacing: 0.08em;
}

.philosophy-headline {
    font-family: var(--font-display);
    font-size: clamp(24px, 3.5vw, 36px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--white);
}

.philosophy-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.55);
    line-height: 1.9;
}

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

.philosophy-card {
    padding: 32px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
}

.philosophy-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px;
    height: 0;
    background: linear-gradient(180deg, var(--blue-400), var(--blue-600));
    border-radius: 0 0 2px 0;
    transition: height var(--transition-base);
}

.philosophy-card:hover {
    background: rgba(0, 200, 255, 0.06);
    border-color: rgba(0, 200, 255, 0.2);
}

.philosophy-card:hover::before {
    height: 100%;
}

.philosophy-card-num {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 900;
    color: rgba(0, 200, 255, 0.15);
    margin-bottom: 8px;
    line-height: 1;
}

.philosophy-card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.philosophy-card-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    line-height: 1.7;
}

/* ---------- 产品特性轮播 ---------- */
.features-carousel-wrapper {
    max-width: 720px;
    margin: 0 auto;
}

.features-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.features-track {
    display: flex;
    transition: transform var(--transition-slow);
    will-change: transform;
}

.features-slide {
    min-width: 100%;
    width: 100%;
    flex-shrink: 0;
}

.features-slide img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
}

.features-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

.features-prev,
.features-next {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all var(--transition-fast);
}

.features-prev:hover,
.features-next:hover {
    background: rgba(0, 200, 255, 0.15);
    border-color: rgba(0, 200, 255, 0.3);
}

.features-prev svg,
.features-next svg {
    width: 20px;
    height: 20px;
}

.features-dots {
    display: flex;
    gap: 8px;
}

.features-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.features-dot.active {
    background: var(--blue-500);
    box-shadow: 0 0 8px rgba(0, 200, 255, 0.4);
    width: 28px;
    border-radius: 5px;
}

/* ---------- 品牌代言人 ---------- */
.ambassador-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.ambassador-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--dark-100);
    transition: all var(--transition-base);
    position: relative;
}

.ambassador-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.ambassador-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--blue-200);
}

.ambassador-card:hover::after {
    opacity: 1;
}

.ambassador-img-wrap {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, var(--dark-800) 0%, var(--dark-900) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.ambassador-img-wrap img {
    width: 100%;
    height: auto;
    max-height: 520px;
    object-fit: contain;
    transition: transform var(--transition-slow);
}

.ambassador-card:hover .ambassador-img-wrap img {
    transform: scale(1.03);
}

.ambassador-info {
    padding: 28px 32px;
}

.ambassador-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--dark-800);
    margin-bottom: 12px;
}

.ambassador-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.ambassador-tag {
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(0,200,255,0.08), rgba(10,132,255,0.08));
    color: var(--blue-600);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid rgba(0,200,255,0.15);
}

.ambassador-desc {
    font-size: 14px;
    color: var(--dark-400);
    line-height: 1.8;
}

/* ---------- 品牌代言人双图并排 ---------- */

/* 代言人双图并排 */
.ba-duo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.ba-card {
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    flex: 1;
}

.ba-card img {
    width: 100%;
    flex: 1;
    min-height: 0;
    object-fit: cover;
    object-position: top center;
    display: block;
}

/* 两张图分别微调object-position，让头部对齐 */
.ba-card:nth-child(1) img { object-position: center top; }
.ba-card:nth-child(2) img { object-position: center top; }

.ba-card .ba-slide-info {
    padding: 10px 12px;
    background: linear-gradient(0deg, rgba(8,10,24,0.95) 0%, rgba(8,10,24,0.7) 100%);
    min-height: 64px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.ba-card .ba-label {
    padding: 8px 12px 6px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.ba-card .ba-label-en {
    font-size: 9px;
    letter-spacing: 0.12em;
}

.ba-card .ba-slide-name {
    font-size: 13px;
}

.ba-card .ba-slide-tags {
    font-size: 10px;
}

.ba-label {
    padding: 14px 20px 12px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.ba-label-en {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--blue-400);
    opacity: 0.8;
}

.ba-label-zh {
    font-size: 18px;
    font-weight: 800;
    color: var(--white);
}

.ba-slide-info {
    padding: 10px 20px 12px;
    background: linear-gradient(to top, rgba(8,10,24,0.95) 0%, rgba(8,10,24,0.6) 100%);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ba-slide-name {
    font-size: 16px;
    font-weight: 800;
    color: var(--white);
}

.ba-slide-tags {
    font-size: 12px;
    color: var(--blue-300);
    opacity: 0.9;
}

/* ---------- 职业赛事赞助 ---------- */
.pro-events-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.pro-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 20px;
    background: linear-gradient(135deg, #0a1628, #0d2040);
    border: 1px solid rgba(0,200,255,0.12);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    position: relative;
}

.pro-badge::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,200,255,0.06), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.pro-badge:hover {
    border-color: rgba(0,200,255,0.35);
    box-shadow: 0 6px 24px rgba(0,200,255,0.12);
    transform: translateY(-3px);
}

.pro-badge:hover::after {
    opacity: 1;
}

.pro-badge img {
    width: 100%;
    height: auto;
    max-height: 100px;
    object-fit: contain;
    display: block;
}

.pro-badge-icon {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--blue-400), var(--blue-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 56px;
    text-align: center;
}

/* 赛事合作 logo 图片 */
.pro-badge-logo {
    width: 64px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #0a1628, #0d2040);
    padding: 6px 8px;
}

.pro-badge-logo-dark {
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
}

.pro-badge-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.pro-badge-text {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    line-height: 1.5;
}

/* ---------- 高校赛事风采 ---------- */
.college-events-intro {
    text-align: center;
    margin-bottom: 48px;
}

.college-events-intro p {
    font-size: 17px;
    color: rgba(255,255,255,0.6);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    border: 1px solid rgba(255,255,255,0.06);
}

.gallery-item-lg {
    grid-column: span 2;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.06);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.6) 100%);
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay span {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
}

/* ---------- 社团报名联系 ---------- */
.contact-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 64px;
    align-items: center;
}

.contact-info {
    max-width: 560px;
}

.contact-headline {
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 800;
    color: var(--dark-800);
    margin-bottom: 16px;
    line-height: 1.3;
}

.contact-desc {
    font-size: 16px;
    color: var(--dark-500);
    margin-bottom: 44px;
    line-height: 1.75;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.contact-item-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(0,200,255,0.08), rgba(10,132,255,0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-600);
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 24px;
    height: 24px;
}

.contact-item-label {
    display: block;
    font-size: 12px;
    color: var(--dark-300);
    font-weight: 500;
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item-value {
    font-size: 16px;
    color: var(--dark-800);
    font-weight: 600;
}

a.contact-item-value:hover {
    color: var(--blue-600);
}

.contact-qr {
    display: flex;
    justify-content: center;
}

.contact-qr-card {
    background: var(--white);
    border: 1px solid var(--dark-100);
    border-radius: var(--radius-xl);
    padding: 36px;
    text-align: center;
    box-shadow: var(--shadow-md);
    min-width: 240px;
    transition: all var(--transition-base);
}

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

.contact-qr-img {
    width: 180px;
    height: 180px;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
    display: block;
    object-fit: contain;
    background: var(--white);
}

.contact-qr-label {
    font-size: 14px;
    color: var(--dark-400);
    line-height: 1.6;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--dark-900);
    color: rgba(255,255,255,0.5);
    padding: 48px 0 36px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    height: 28px;
    opacity: 0.6;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--blue-400);
}

.footer-copyright p {
    font-size: 13px;
    color: rgba(255,255,255,0.3);
}

/* ---------- 灯箱 ---------- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.92);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    transition: transform var(--transition-base);
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: background var(--transition-fast);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255,255,255,0.2);
}

.lightbox-close { top: 24px; right: 24px; }
.lightbox-prev { left: 24px; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 24px; top: 50%; transform: translateY(-50%); }

.lightbox-close svg,
.lightbox-prev svg,
.lightbox-next svg {
    width: 24px;
    height: 24px;
}

/* ---------- 动画 ---------- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s cubic-bezier(0, 0, 0.2, 1), transform 0.6s cubic-bezier(0, 0, 0.2, 1);
}

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

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* 子元素逐级延迟 */
.brand-highlight-card:nth-child(2) { transition-delay: 0.1s; }
.brand-highlight-card:nth-child(3) { transition-delay: 0.2s; }
.philosophy-card:nth-child(2) { transition-delay: 0.15s; }
.philosophy-card:nth-child(3) { transition-delay: 0.3s; }
.gallery-item:nth-child(2) { transition-delay: 0.05s; }
.gallery-item:nth-child(3) { transition-delay: 0.1s; }
.gallery-item:nth-child(4) { transition-delay: 0.15s; }
.gallery-item:nth-child(5) { transition-delay: 0.2s; }
.gallery-item:nth-child(6) { transition-delay: 0.25s; }
.pro-badge:nth-child(2) { transition-delay: 0.1s; }
.pro-badge:nth-child(3) { transition-delay: 0.2s; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    :root {
        --section-py: 60px;
    }

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

    .contact-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .contact-info { max-width: 100%; }
    .contact-qr { justify-content: center; }
    .contact-item { justify-content: center; }
}

@media (max-width: 768px) {
    :root {
        --section-py: 72px;
        --nav-height: 60px;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0; right: 0;
        background: rgba(8, 10, 24, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        border-bottom: 1px solid rgba(0,200,255,0.1);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-logo-sub {
        font-size: 15px;
        letter-spacing: 1px;
    }

    .nav-logo-divider {
        height: 24px;
    }

    .nav-toggle { display: flex; }

    .nav-link { padding: 12px 16px; width: 100%; text-align: center; }
    .nav-link-cta { margin-left: 0; margin-top: 8px; }

    .brand-main { grid-template-columns: 1fr; gap: 48px; }
    .brand-hero { grid-template-columns: 1fr; gap: 32px; }
    .brand-right { position: static; }
    .brand-highlights { grid-template-columns: 1fr; }
    .ba-duo { gap: 8px; }

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

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

    .gallery-item-lg { grid-column: span 2; }

    .pro-events-badges { flex-direction: column; align-items: stretch; }
    .pro-badge { justify-content: center; }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .gallery-grid { grid-template-columns: 1fr; }
    .gallery-item-lg { grid-column: span 1; }

    .philosophy-icon-row { justify-content: center; }

    /* 代言人双图小屏叠为单列 */
    .ba-duo { grid-template-columns: 1fr; }

    /* 品牌介绍小屏 */
    .brand-lead { font-size: 16px; }
    .brand-desc { font-size: 13px; }
    .pro-badge { padding: 10px 14px; }
    .pro-badge-icon { font-size: 14px; min-width: 44px; }

    /* 代言人轮播小屏 */
    .ba-label-zh { font-size: 15px; }
    .ba-slide-name { font-size: 14px; }
    .ba-slide-tags { font-size: 11px; }

    /* 电竞理念小屏 */
    .philosophy-headline { font-size: 22px; }
    .philosophy-card { padding: 20px; }

    /* 合作联系小屏 */
    .contact-content { grid-template-columns: 1fr; gap: 24px; text-align: center; }
    .contact-qr { display: flex; justify-content: center; }
    .contact-headline { font-size: 20px; }
}