/* --- CSS 变量与重置 --- */
:root {
    --primary-color: #48BE79; /* 金色 - 品牌色 */
    --primary-dark:#48BE79;
    --secondary-color: #48BE79; /* 深蓝 - 信任 */
    --accent-green: #4CAF50;
    --text-color: #333333;
    --text-light: #666666;
    --bg-light: #f4f7f6;
    --white: #ffffff;
    --border-radius: 12px;
    --shadow: 0 10px 30px rgba(0,0,0,0.08);
    --container-width: 1200px;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    scroll-behavior: smooth;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* --- 布局工具 --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* --- 头部导航 --- */
header {
    background-color: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 8px;
    width: 160px;
}

.nav-links { display: flex; gap: 30px; }
.nav-links a { font-weight: 600; font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-dark); }

.mobile-menu-btn { display: none; font-size: 1.5rem; cursor: pointer; }

/* --- Footer & Legal --- */
footer {
    background-color: var(--secondary-color);
    color: #fff;
    padding: 60px 0 30px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-logo { font-weight: 700; margin-bottom: 20px; display: block; width: 170px }
.footer-col h4 { margin-bottom: 20px; font-size: 1.1rem; color: #fff; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a:hover { opacity: 1; padding-left: 5px; }
.copyright { text-align: center; border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px; font-size: 1rem; }

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 179, 0, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(255, 179, 0, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 179, 0, 0); }
}

/* --- 响应式 --- */
@media (max-width: 992px) {
    .hero-layout, .app-download-section { flex-direction: column; text-align: center; }
    .hero-text h1 { font-size: 2.5rem; }
    .hero-image img { max-width: 80%; margin: 0 auto; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
    .process-steps { flex-direction: column; gap: 40px; }
    .process-steps::before { display: none; }
    .store-btns { justify-content: center; }
    .step-circle { margin: 0 auto 15px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
    .stats-grid { display: flex; flex-direction: column; gap: 30px; }
    .section { padding: 50px 0; }
}