/* ===== 基础变量 (暗色默认) ===== */
:root {
    --bg: #000;
    --bg-alt: #0d0d0d;
    --bg-card: rgba(30,30,30,0.6);
    --bg-card-solid: #1a1a1a;
    --bg-input: rgba(255,255,255,0.05);
    --text: #f5f5f7;
    --text-secondary: rgba(255,255,255,0.6);
    --text-muted: #86868b;
    --primary: #0071e3;
    --primary-light: #2997ff;
    --accent: #42a5f5;
    --border: rgba(255,255,255,0.06);
    --border-light: rgba(255,255,255,0.1);
    --shadow-card: 0 20px 60px rgba(0,0,0,0.5);
    --shadow-btn: 0 4px 20px rgba(0,113,227,0.35);
    --shadow-btn-hover: 0 8px 30px rgba(0,113,227,0.5);
    --gradient-title: linear-gradient(180deg, #fff 0%, #a1c4fd 100%);
    --gradient-orb-1: radial-gradient(circle, rgba(0,113,227,0.3) 0%, transparent 70%);
    --gradient-orb-2: radial-gradient(circle, rgba(66,165,245,0.2) 0%, transparent 70%);
    --gradient-orb-3: radial-gradient(circle, rgba(100,181,246,0.15) 0%, transparent 70%);
    --gradient-card: linear-gradient(180deg, rgba(30,30,30,0.8) 0%, rgba(20,20,20,0.9) 100%);
    --gradient-card-alt: linear-gradient(180deg, rgba(30,30,30,0.6) 0%, rgba(15,15,15,0.8) 100%);
    --gradient-gc: linear-gradient(135deg, #1a237e 0%, #0d47a1 50%, #01579b 100%);
    --nav-bg: rgba(0,0,0,0.72);
    --nav-border: rgba(255,255,255,0.08);
    --tag-bg: rgba(0,113,227,0.12);
    --step-hover-bg: rgba(0,113,227,0.06);
    --success-bg: rgba(34,197,94,0.06);
    --success-border: rgba(34,197,94,0.2);
    --footer-bg: #000;
    --gc-region-bg: rgba(255,255,255,0.12);
    --gc-region-border: rgba(255,255,255,0.2);
    --gc-region-hover: rgba(255,255,255,0.25);
    --radius: 28px;
    --radius-sm: 18px;
    --radius-xs: 14px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

/* ===== 亮色主题变量 ===== */
[data-theme="light"] {
    --bg: #f5f5f7;
    --bg-alt: #fff;
    --bg-card: rgba(255,255,255,0.8);
    --bg-card-solid: #fff;
    --bg-input: rgba(0,0,0,0.03);
    --text: #1d1d1f;
    --text-secondary: #86868b;
    --text-muted: #a1a1a6;
    --primary: #0071e3;
    --primary-light: #0071e3;
    --accent: #42a5f5;
    --border: rgba(0,0,0,0.06);
    --border-light: rgba(0,0,0,0.1);
    --shadow-card: 0 20px 60px rgba(0,0,0,0.08);
    --shadow-btn: 0 4px 20px rgba(0,113,227,0.25);
    --shadow-btn-hover: 0 8px 30px rgba(0,113,227,0.35);
    --gradient-title: linear-gradient(180deg, #1d1d1f 0%, #434344 100%);
    --gradient-orb-1: radial-gradient(circle, rgba(0,113,227,0.12) 0%, transparent 70%);
    --gradient-orb-2: radial-gradient(circle, rgba(66,165,245,0.08) 0%, transparent 70%);
    --gradient-orb-3: radial-gradient(circle, rgba(100,181,246,0.06) 0%, transparent 70%);
    --gradient-card: linear-gradient(180deg, rgba(255,255,255,0.9) 0%, rgba(245,245,247,0.95) 100%);
    --gradient-card-alt: linear-gradient(180deg, rgba(255,255,255,0.8) 0%, rgba(245,245,247,0.9) 100%);
    --gradient-gc: linear-gradient(135deg, #1565c0 0%, #0d47a1 50%, #01579b 100%);
    --nav-bg: rgba(255,255,255,0.72);
    --nav-border: rgba(0,0,0,0.06);
    --tag-bg: rgba(0,113,227,0.08);
    --step-hover-bg: rgba(0,113,227,0.04);
    --success-bg: rgba(34,197,94,0.04);
    --success-border: rgba(34,197,94,0.15);
    --footer-bg: #f5f5f7;
    --gc-region-bg: rgba(255,255,255,0.2);
    --gc-region-border: rgba(255,255,255,0.3);
    --gc-region-hover: rgba(255,255,255,0.35);
}

/* 主题切换过渡 */
body, .navbar, .biz-card, .glass-card, .gradient-card, .form-card,
.step, .service-item, .feature-item, .game-item, .ci-item,
.df-item, .gc-regions span, .game-badges span, .biz-tags span {
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1024px; margin: 0 auto; padding: 0 24px; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px; padding: 14px 28px; border-radius: 980px;
    font-size: 17px; font-weight: 400; transition: var(--transition);
    cursor: pointer; border: none; font-family: var(--font); letter-spacing: 0.2px;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; box-shadow: var(--shadow-btn);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-btn-hover); }
.btn-text { color: var(--primary-light); font-size: 17px; background: transparent; padding: 14px 20px; }
.btn-text:hover { text-decoration: underline; text-underline-offset: 4px; }
.btn-full { width: 100%; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 0; transition: var(--transition);
    background: var(--nav-bg); backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--nav-border);
}
.nav-container {
    max-width: 1024px; margin: 0 auto; padding: 0 22px;
    display: flex; align-items: center; justify-content: space-between; height: 48px;
}
.logo-text {
    font-size: 21px; font-weight: 700; letter-spacing: -0.5px;
    background: var(--gradient-title);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-menu { display: flex; gap: 28px; align-items: center; }
.nav-link {
    font-size: 12px; color: var(--text-secondary); transition: color 0.3s;
    letter-spacing: 0.2px; position: relative; padding: 4px 0;
}
.nav-link::after {
    content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1.5px;
    background: var(--primary-light); border-radius: 1px; transition: width 0.3s;
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after { width: 100%; }

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

/* 主题切换按钮 */
.theme-toggle {
    width: 36px; height: 36px; border-radius: 50%;
    background: transparent; border: 1px solid var(--border-light);
    color: var(--text-secondary); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition); position: relative;
}
.theme-toggle:hover {
    background: var(--bg-input); color: var(--text);
    border-color: var(--primary-light);
}
.theme-toggle svg {
    width: 18px; height: 18px; position: absolute;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
}
.theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

.nav-cta {
    font-size: 12px; color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    padding: 6px 16px; border-radius: 980px; font-weight: 500; transition: var(--transition);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 15px rgba(0,113,227,0.4); }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 20px; height: 1.5px; background: var(--text); border-radius: 1px; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
    min-height: 100vh; display: flex; flex-direction: column;
    align-items: center; justify-content: center; position: relative;
    overflow: hidden; padding: 120px 24px 80px; text-align: center;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.orb { position: absolute; border-radius: 50%; filter: blur(80px); }
.orb-1 { width: 600px; height: 600px; background: var(--gradient-orb-1); top: -15%; right: -10%; animation: float 10s ease-in-out infinite; }
.orb-2 { width: 500px; height: 500px; background: var(--gradient-orb-2); bottom: -15%; left: -10%; animation: float 10s ease-in-out infinite 3s; }
.orb-3 { width: 400px; height: 400px; background: var(--gradient-orb-3); top: 40%; left: 25%; animation: float 10s ease-in-out infinite 6s; }
@keyframes float { 0%,100%{transform:translate(0,0)scale(1)} 33%{transform:translate(30px,-30px)scale(1.05)} 66%{transform:translate(-20px,20px)scale(0.95)} }

.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 20px; background: var(--bg-input);
    border: 1px solid var(--border-light); border-radius: 100px;
    font-size: 13px; color: var(--primary-light); margin-bottom: 32px; letter-spacing: 1px;
}
.hero-title { margin-bottom: 24px; }
.title-main {
    display: block; font-size: clamp(48px, 8vw, 96px); font-weight: 700;
    line-height: 1.05; letter-spacing: -0.03em;
    background: var(--gradient-title);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.title-sub {
    display: block; font-size: clamp(20px, 3vw, 32px); font-weight: 500;
    color: var(--text-secondary); margin-top: 8px; letter-spacing: -0.01em;
}
.hero-desc { font-size: 21px; color: var(--text-secondary); max-width: 600px; margin: 0 auto 40px; line-height: 1.5; }
.hero-cta-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.arrow { font-size: 14px; transition: transform 0.3s; }
.btn-primary:hover .arrow { transform: translateX(4px); }

.scroll-hint { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); animation: bounce 2s infinite; }
.mouse { width: 24px; height: 40px; border: 2px solid var(--border-light); border-radius: 12px; display: flex; justify-content: center; padding-top: 8px; }
.wheel { width: 4px; height: 8px; background: var(--text-muted); border-radius: 2px; animation: scroll 2s infinite; }
@keyframes bounce { 0%,100%{transform:translateX(-50%)translateY(0)} 50%{transform:translateX(-50%)translateY(10px)} }
@keyframes scroll { 0%{opacity:1;transform:translateY(0)} 100%{opacity:0;transform:translateY(12px)} }

/* ===== 通用区块 ===== */
.section { padding: 120px 0; position: relative; }
.section-dark { background: var(--bg); }
.section-alt { background: var(--bg-alt); }
.section::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-light), transparent);
}
.section-header { text-align: center; margin-bottom: 80px; }
.section-label { font-size: 14px; font-weight: 600; color: var(--primary-light); margin-bottom: 12px; display: block; letter-spacing: 0.5px; }
.section-title { font-size: clamp(32px, 5vw, 56px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; margin-bottom: 8px; }
.section-desc { font-size: 19px; color: var(--text-secondary); margin-top: 8px; }

/* ===== 业务卡片 ===== */
.biz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.biz-card {
    background: var(--gradient-card);
    border-radius: var(--radius); padding: 48px 40px; position: relative; overflow: hidden;
    border: 1px solid var(--border); transition: var(--transition);
    backdrop-filter: blur(20px);
}
.biz-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent); transform: scaleX(0); transition: transform 0.5s;
}
.biz-card:hover { transform: scale(1.02); border-color: rgba(0,113,227,0.3); }
.biz-card:hover::before { transform: scaleX(1); }
.biz-num { position: absolute; top: 20px; right: 24px; font-size: 48px; font-weight: 900; color: var(--border-light); line-height: 1; font-family: var(--font); }
.biz-card h3 { font-size: 28px; font-weight: 700; margin: 12px 0 4px; letter-spacing: -0.02em; }
.biz-en { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.biz-desc { font-size: 17px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 20px; }
.biz-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.biz-tags span { padding: 6px 14px; background: var(--tag-bg); color: var(--primary-light); border-radius: 100px; font-size: 13px; }

/* ===== 详情布局 ===== */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.detail-grid.reverse { direction: rtl; }
.detail-grid.reverse > * { direction: ltr; }
.detail-left h3, .detail-right h3 { font-size: 32px; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.02em; line-height: 1.2; }
.detail-text { font-size: 17px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 40px; }

/* 步骤 */
.steps { display: flex; flex-direction: column; gap: 16px; }
.step { display: flex; align-items: center; gap: 20px; padding: 20px 24px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.step:hover { background: var(--step-hover-bg); border-color: rgba(0,113,227,0.2); transform: translateX(4px); }
.step-num { width: 40px; height: 40px; min-width: 40px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; }
.step-body h4 { font-size: 16px; font-weight: 600; margin-bottom: 2px; }
.step-body p { font-size: 14px; color: var(--text-muted); }

/* 玻璃卡片 */
.glass-card {
    background: var(--gradient-card-alt);
    border-radius: var(--radius); padding: 40px; border: 1px solid var(--border); position: relative;
    box-shadow: var(--shadow-card); backdrop-filter: blur(20px);
}
.glass-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, transparent, rgba(0,113,227,0.4), transparent); }
.card-label { font-size: 13px; font-weight: 600; color: var(--primary-light); margin-bottom: 20px; letter-spacing: 0.5px; }
.card-list { display: flex; flex-direction: column; gap: 14px; }
.card-list li { font-size: 15px; color: var(--text-secondary); padding-left: 20px; position: relative; line-height: 1.5; list-style: none; }
.card-list li::before { content: ''; position: absolute; left: 0; top: 8px; width: 6px; height: 6px; background: var(--primary-light); border-radius: 50%; }
.card-footer { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); }
.card-footer p { font-size: 14px; color: var(--primary-light); font-weight: 500; line-height: 1.6; }

/* Demo */
.demo-header { display: flex; align-items: center; gap: 10px; margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.demo-dot { width: 10px; height: 10px; background: #22c55e; border-radius: 50%; animation: pulse 2s infinite; }
.demo-header span { font-size: 14px; font-weight: 600; color: var(--text); }
.demo-flow { display: flex; flex-direction: column; gap: 12px; }
.df-item { display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: var(--bg-input); border-radius: var(--radius-xs); border: 1px solid var(--border); }
.df-item.success { background: var(--success-bg); border-color: var(--success-border); }
.df-emoji { font-size: 20px; width: 32px; text-align: center; }
.df-item div { display: flex; flex-direction: column; }
.df-item strong { font-size: 15px; font-weight: 600; }
.df-item span { font-size: 13px; color: var(--text-muted); }
.df-arrow { text-align: center; color: var(--text-muted); font-size: 14px; }
.demo-footer { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.demo-footer p { font-size: 14px; color: var(--text-muted); font-style: italic; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(0.8)} }

/* 渐变卡片 */
.gradient-card {
    background: var(--gradient-gc);
    border-radius: var(--radius); padding: 48px; color: #fff;
    box-shadow: 0 20px 60px rgba(0,113,227,0.3); position: relative; overflow: hidden;
}
.gradient-card::before { content: ''; position: absolute; top: -50%; right: -30%; width: 300px; height: 300px; background: rgba(255,255,255,0.05); border-radius: 50%; }
.gc-label { font-size: 12px; letter-spacing: 2px; opacity: 0.7; display: block; margin-bottom: 8px; }
.gc-title { font-size: 36px; font-weight: 700; margin-bottom: 4px; }
.gc-sub { font-size: 17px; opacity: 0.9; margin-bottom: 32px; }
.gc-divider { height: 1px; background: rgba(255,255,255,0.2); margin-bottom: 32px; }
.gc-regions-label { font-size: 13px; letter-spacing: 1px; opacity: 0.7; margin-bottom: 16px; }
.gc-regions { display: flex; flex-wrap: wrap; gap: 10px; position: relative; z-index: 1; }
.gc-regions span { padding: 8px 16px; background: var(--gc-region-bg); border: 1px solid var(--gc-region-border); border-radius: 100px; font-size: 14px; font-weight: 500; transition: var(--transition); color: #fff; }
.gc-regions span:hover { background: var(--gc-region-hover); transform: translateY(-2px); }

/* 服务列表 */
.service-list { display: flex; flex-direction: column; gap: 16px; }
.service-item { display: flex; align-items: flex-start; gap: 16px; padding: 20px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.service-item:hover { border-color: rgba(0,113,227,0.2); }
.si-icon { font-size: 24px; width: 44px; height: 44px; min-width: 44px; background: var(--bg-input); border-radius: 12px; display: flex; align-items: center; justify-content: center; }
.service-item h4 { font-size: 16px; font-weight: 600; margin-bottom: 2px; }
.service-item p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

/* 功能列表 */
.feature-list { display: flex; flex-direction: column; gap: 16px; }
.feature-item { padding: 28px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.feature-item:hover { transform: translateY(-4px); border-color: rgba(0,113,227,0.2); box-shadow: var(--shadow-card); }
.fi-icon { width: 48px; height: 48px; color: var(--primary-light); margin-bottom: 16px; }
.fi-icon svg { width: 100%; height: 100%; }
.feature-item h4 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.feature-item p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

/* 游戏统计 */
.game-stats { display: flex; align-items: center; gap: 32px; margin-bottom: 40px; padding: 24px 32px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); }
.gs-item { text-align: center; }
.gs-num { font-size: 40px; font-weight: 900; color: var(--primary-light); line-height: 1; }
.gs-num span { font-size: 18px; font-weight: 600; margin-left: 2px; }
.gs-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; display: block; }
.gs-divider { width: 1px; height: 40px; background: var(--border); }

/* 游戏卡片 */
.game-list { display: flex; flex-direction: column; gap: 16px; }
.game-item { padding: 24px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); position: relative; transition: var(--transition); }
.game-item:hover { border-color: rgba(0,113,227,0.2); }
.gi-badge { position: absolute; top: -1px; right: 24px; padding: 4px 12px; border-radius: 0 0 8px 8px; font-size: 11px; font-weight: 700; letter-spacing: 1px; }
.gi-badge.hot { background: #ef4444; }
.gi-badge.new { background: #f59e0b; }
.gi-badge.pro { background: var(--primary); }
.game-item h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.game-item p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

/* 游戏展示卡片 */
.game-card { text-align: center; }
.game-year { display: flex; align-items: baseline; justify-content: center; gap: 4px; margin-bottom: 16px; position: relative; z-index: 1; }
.gy-num { font-size: 80px; font-weight: 900; line-height: 1; text-shadow: 0 4px 20px rgba(0,0,0,0.3); }
.gy-unit { font-size: 24px; font-weight: 600; opacity: 0.9; }
.game-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; position: relative; z-index: 1; }
.game-sub { font-size: 14px; opacity: 0.9; margin-bottom: 32px; position: relative; z-index: 1; }
.game-badges { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; position: relative; z-index: 1; }
.game-badges span { padding: 10px 18px; background: rgba(255,255,255,0.15); border-radius: 100px; font-size: 14px; font-weight: 500; backdrop-filter: blur(10px); }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.contact-left h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 12px; letter-spacing: -0.02em; line-height: 1.2; }
.contact-sub { font-size: 17px; color: var(--text-secondary); margin-bottom: 48px; }
.contact-info { display: flex; flex-direction: column; gap: 20px; }
.ci-item { display: flex; align-items: center; gap: 16px; padding: 20px 24px; background: var(--bg-input); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.ci-item:hover { border-color: rgba(0,113,227,0.2); }
.ci-icon { width: 48px; height: 48px; min-width: 48px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 14px; display: flex; align-items: center; justify-content: center; color: #fff; }
.ci-icon svg { width: 22px; height: 22px; }
.ci-label { font-size: 12px; color: var(--text-muted); display: block; margin-bottom: 2px; }
.ci-value { font-size: 15px; font-weight: 600; }

.form-card {
    background: var(--gradient-card);
    border-radius: var(--radius); padding: 40px; border: 1px solid var(--border);
    box-shadow: var(--shadow-card); backdrop-filter: blur(20px);
}
.form-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 14px 18px; background: var(--bg-input);
    border: 1px solid var(--border); border-radius: var(--radius-xs);
    color: var(--text); font-size: 15px; font-family: var(--font); outline: none; transition: var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--primary); background: rgba(0,113,227,0.04); box-shadow: 0 0 0 3px rgba(0,113,227,0.08);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }
.form-group select { cursor: pointer; appearance: none; color: var(--text-muted); }
.form-group select option { background: var(--bg-card-solid); color: var(--text); }
.form-group textarea { resize: vertical; min-height: 80px; }

/* ===== Footer ===== */
.footer { background: var(--footer-bg); padding: 40px 0 24px; border-top: 1px solid var(--border); transition: background-color 0.5s ease; }
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; flex-wrap: wrap; gap: 32px; }
.footer-brand .logo-text { font-size: 18px; font-weight: 700; letter-spacing: -0.5px; background: var(--gradient-title); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.footer-brand p { margin-top: 8px; font-size: 14px; color: var(--text-muted); }
.footer-links { display: flex; gap: 48px; }
.fl-group h4 { font-size: 12px; font-weight: 600; color: var(--text); margin-bottom: 12px; }
.fl-group a { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 8px; transition: color 0.3s; }
.fl-group a:hover { color: var(--text); }
.footer-bottom { padding-top: 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.footer-bottom p { font-size: 12px; color: var(--text-muted); }

/* ===== 滚动动画 ===== */
[data-aos] { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
[data-aos].aos-animate { opacity: 1; transform: translateY(0); }

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px;
    border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; border: none; font-size: 20px; cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,113,227,0.35); opacity: 0; transform: translateY(20px);
    transition: all 0.3s ease; z-index: 999; display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .biz-grid { grid-template-columns: 1fr; }
    .detail-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .detail-grid.reverse { direction: ltr; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed; top: 0; right: -100%; width: 80%; max-width: 320px; height: 100vh;
        background: var(--bg-card-solid); backdrop-filter: blur(20px); flex-direction: column;
        padding: 80px 32px 32px; gap: 24px; transition: right 0.3s ease; z-index: 999;
        border-left: 1px solid var(--border);
    }
    .nav-menu.active { right: 0; }
    .hamburger { display: flex; z-index: 1001; }
    .nav-cta { display: none; }
    .nav-actions { gap: 12px; }
    .hero-cta-group { flex-direction: column; align-items: center; }
    .btn { width: 100%; max-width: 280px; }
    .game-stats { flex-direction: column; gap: 16px; }
    .gs-divider { width: 60px; height: 1px; }
    .game-badges { flex-direction: column; align-items: center; }
    .footer-top { flex-direction: column; }
    .footer-links { gap: 40px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .gy-num { font-size: 60px; }
    .theme-toggle { width: 32px; height: 32px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .biz-card, .glass-card, .gradient-card, .form-card { padding: 28px 24px; }
    .section { padding: 80px 0; }
}