/* 全局基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background-color: var(--bg-color-general);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: var(--font-size);
    font-weight: var(--font-weight);
    line-height: var(--font-line-height-sub);
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}

/* 顶部导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 5, 20, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color-light);
    z-index: 100;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    width: 48px;
    height: 48px;
}
.qrcode {
    width: 256px;
    height: 256px;
}
.nav-links {
    display: flex;
    gap: 30px;
}
.nav-links a:hover {
    color: var(--color-primary-sub);
}

/* Hero 视觉首屏 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 20% 80%, rgba(15, 198, 194, 0.1) 0%, transparent 50%);
    padding: 120px 20px 60px;
    text-align: center;
}
.hero-content {
    max-width: 800px;
}
.badge {
    background-color: var(--color-primary-light4);
    border: 1px solid var(--color-primary-light2);
    color: var(--color-primary-sub);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: var(--font-size-small);
    display: inline-block;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 700;
}
.hero h1 span {
    color: var(--color-primary-sub);
    text-shadow: 0 0 20px rgba(167, 139, 250, 0.4);
}
.hero p {
    font-size: var(--font-size-big);
    color: var(--text-color-sub);
    margin-bottom: 40px;
}
.btn-download {
    background-color: var(--color-primary);
    color: var(--white);
    padding: 16px 40px;
    border-radius: 50px;
    font-size: var(--font-size-middle);
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
    display: inline-block;
}
.btn-download:hover {
    background-color: var(--color-purple);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(176, 110, 237, 0.6);
}

/* 核心功能区 */
.features {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 20px;
}
.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: var(--font-size-large);
    color: var(--text-color);
    margin-bottom: 10px;
}
.section-title p {
    color: var(--text-color-general);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 100fr));
    gap: 30px;
}
.card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 20px; /* 兼容PC端非rpx体验 */
    padding: 40px 30px;
    transition: transform 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary-light2);
}
.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-big);
    margin-bottom: 24px;
}
/* 为卡片图标赋予不同的主题色 */
.icon-pin { background-color: var(--color-primary-light4); color: var(--color-primary-sub); }
.icon-find { background-color: rgba(15, 198, 194, 0.2); color: var(--color-ching); }
.icon-feed { background-color: rgba(247, 114, 52, 0.2); color: var(--color-orange); }

.card h3 {
    font-size: var(--font-size-big);
    margin-bottom: 16px;
    color: var(--text-color);
}
.card p {
    color: var(--text-color-sub);
    font-size: var(--font-size-middle);
}

/* 页脚 */
footer {
    background-color: var(--bg-color-sub);
    border-top: 1px solid var(--border-color-lighter);
    padding: 40px 20px;
    text-align: center;
    color: var(--text-color-sub);
    font-size: var(--font-size-small);
}

/* 移动端简单适配 */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .nav-links { display: none; }
}