:root {
    --bg-color: #020617;
    --surface-color: #0f172a;
    --surface-glass: rgba(15, 23, 42, 0.5);
    --surface-border: rgba(255, 255, 255, 0.1);
    
    /* 核心主题色：AI科技绿 + 运动活力 */
    --neon-green: #ccff00;
    --neon-blue: #3b82f6;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 动态发光背景 */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.4;
    animation: pulse 10s infinite alternate;
}

.blur-1 {
    top: -10%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--neon-blue) 0%, transparent 70%);
}

.blur-2 {
    bottom: -10%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--neon-green) 0%, transparent 70%);
    animation-delay: -5s;
}

@keyframes pulse {
    0% { transform: scale(1) translate(0, 0); opacity: 0.3; }
    100% { transform: scale(1.1) translate(50px, 50px); opacity: 0.5; }
}

/* 导航栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--surface-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--neon-green);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--neon-green);
}

.btn-outline {
    border: 1px solid var(--surface-border);
    padding: 0.5rem 1.2rem;
    border-radius: 100px;
    background: var(--surface-glass);
}
.btn-outline:hover {
    border-color: var(--neon-green);
    box-shadow: 0 0 15px rgba(204, 255, 0, 0.2);
}

/* 按钮 */
.btn-primary {
    display: inline-block;
    background: var(--neon-green);
    color: #000;
    font-weight: 800;
    padding: 1rem 2rem;
    border-radius: 100px;
    text-decoration: none;
    box-shadow: 0 0 20px rgba(204, 255, 0, 0.3);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(204, 255, 0, 0.5);
}

/* 玻璃拟态卡片 */
.glass-card {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--surface-border);
    border-radius: 20px;
    padding: 2rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-5px);
}

/* 首屏区域 */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    gap: 4rem;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(204, 255, 0, 0.1);
    color: var(--neon-green);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(204, 255, 0, 0.2);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.text-gradient {
    background: linear-gradient(to right, var(--neon-green), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

/* 首屏右侧 3D 悬浮卡片 */
.hero-visual {
    flex: 1;
    position: relative;
    height: 500px;
    perspective: 1000px;
}

.float-1, .float-2, .float-3 {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    animation: float-anim 6s ease-in-out infinite;
}

.float-1 { top: 10%; right: 10%; width: 320px; transform: rotateY(-10deg) rotateX(10deg); z-index: 3; }
.float-2 { top: 40%; left: 0; width: 280px; transform: rotateY(15deg) rotateX(-5deg); animation-delay: -2s; z-index: 2; background: rgba(59, 130, 246, 0.1); border-color: rgba(59, 130, 246, 0.3);}
.float-3 { bottom: 10%; right: 20%; width: 300px; transform: rotateY(-5deg) rotateX(15deg); animation-delay: -4s; z-index: 1; }

.card-icon {
    font-size: 2rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.8rem;
    border-radius: 12px;
}

.card-text h4 {
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}
.card-text p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.score {
    margin-left: auto;
    color: var(--neon-green);
    font-weight: 800;
    font-size: 1.2rem;
}

@keyframes float-anim {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-15px) scale(1.02); }
}

/* 统一段落结构 */
.section {
    padding: 8rem 5%;
}

.bg-darker {
    background: rgba(0,0,0,0.2);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 痛点三列布局 */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: linear-gradient(145deg, var(--surface-color), transparent);
    border: 1px solid var(--surface-border);
    padding: 2.5rem;
    border-radius: 20px;
}

.icon-wrapper {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Bento Grid 功能墙 */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.bento-box.wide {
    grid-column: span 2;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bento-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--neon-green);
}

.bento-content p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 500px;
}

.mock-score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid var(--neon-green);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--neon-green);
    box-shadow: 0 0 30px rgba(204, 255, 0, 0.2);
}

.mock-score-circle span {
    font-size: 1rem;
    margin-left: 2px;
}

/* 未来愿景布局 */
.vision-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.vision-item {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    padding: 2rem;
    background: var(--surface-glass);
    border: 1px solid var(--surface-border);
    border-radius: 16px;
}

.vision-number {
    font-size: 3rem;
    font-weight: 800;
    color: rgba(255,255,255,0.1);
    line-height: 1;
}

.vision-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--neon-blue);
}

.vision-item p {
    color: var(--text-muted);
}

/* Footer */
.footer {
    border-top: 1px solid var(--surface-border);
    padding: 4rem 5%;
    text-align: center;
    background: #000;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
}
.footer-logo span { color: var(--neon-green); }

.footer p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--surface-border);
    border-radius: 100px;
    transition: all 0.3s ease;
}
.footer-links a:hover {
    background: var(--text-main);
    color: #000;
}

.copyright {
    margin-top: 4rem;
    font-size: 0.8rem;
    opacity: 0.5;
}

/* 简单的显示隐藏动画类 */
.hidden {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}
.show {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 768px) {
    .hero { flex-direction: column; text-align: center; justify-content: center; padding-top: 4rem; }
    .hero-visual { display: none; }
    .hero-title { font-size: 2.8rem; }
    .bento-grid { grid-template-columns: 1fr; }
    .bento-box.wide { grid-column: span 1; flex-direction: column; gap: 2rem; text-align: center; }
    .vision-item { flex-direction: column; gap: 1rem; }
}

.btn-lang { background: transparent; border: 1px solid var(--neon-green); color: var(--neon-green); padding: 0.5rem 1rem; border-radius: 100px; cursor: pointer; font-weight: 600; font-family: 'Inter', sans-serif; transition: all 0.3s ease; }
.btn-lang:hover { background: var(--neon-green); color: #000; box-shadow: 0 0 10px rgba(204, 255, 0, 0.4); }