* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
}
body {
    background-color: #ffffff;
    color: #333842;
}
.container {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 20px;
}
/* 导航栏 */
.header {
    background: #ffffff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    padding: 14px 0;
    position: sticky;
    top:0;
    z-index:10;
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(90deg, #4080ff, #926bff);
    -webkit-background-clip: text;
    color: transparent;
}
.nav a {
    color: #444955;
    text-decoration: none;
    margin-left: 24px;
    font-size: 15px;
    transition: color 0.2s;
}
.nav a:hover {
    color: #5b7cff;
}
/* 主区域 */
.main {
    padding: 40px 0;
    min-height: calc(100vh - 180px);
}
/* 品牌导航 */
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 1px;
    color: #23283a;
}
.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    object-fit: cover;
    border: 1px solid #eceef4;
}
.nav a.active {
    background: linear-gradient(90deg, #6f6bf2, #8f7bf5);
    color: #fff;
    padding: 8px 18px;
    border-radius: 999px;
}
/* 首屏横幅：直接采用设计效果图裁剪图 */
.hero {
    background: url("../images/hero-bg.jpg") center top / 100% auto no-repeat;
    aspect-ratio: 1259 / 306;
}
/* 功能区：功能总标题 + 四大功能卡片 */
.features {
    padding: 46px 0 34px;
}
.section-title {
    text-align: center;
    font-family: "Ma Shan Zheng", "STXingkai", "XingKai", "KaiTi", "STKaiti", serif;
    font-size: 34px;
    font-weight: 400;
    color: #1f2440;
    letter-spacing: 2px;
    margin-bottom: 4px;
}
.section-sub {
    text-align: center;
    color: #7b81a0;
    font-size: 13px;
    letter-spacing: 3px;
    margin-bottom: 26px;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.feature-card {
    border-radius: 16px;
    padding: 18px 18px 16px;
    border: 2px solid transparent;
    background-origin: border-box;
    background-clip: padding-box, border-box;
    box-shadow: 0 6px 16px rgba(90, 90, 150, 0.10);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 14px 26px rgba(90, 90, 150, 0.18);
}
.card-purple { background-image: linear-gradient(160deg, #f2effe, #e9e4fc), linear-gradient(130deg, #8f7bf5, #c9b7f7); }
.card-purple h3 { color: #6f5fe0; }
.card-cream { background-image: linear-gradient(160deg, #fdf7e9, #f6ecd4), linear-gradient(130deg, #e0b66a, #f0d9a8); }
.card-cream h3 { color: #a8823c; }
.card-blue { background-image: linear-gradient(160deg, #edf3fe, #e2e9fc), linear-gradient(130deg, #6f8ef2, #a8bcf7); }
.card-blue h3 { color: #4a6fbf; }
.card-lav { background-image: linear-gradient(160deg, #ebf6fd, #dcf0fa), linear-gradient(130deg, #4f9fc9, #8ecbe6); }
.card-lav h3 { color: #3d7fa6; }
.card-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.card-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    object-fit: cover;
    mix-blend-mode: multiply;
    flex-shrink: 0;
}
.feature-card h3 {
    font-size: 17px;
    color: #262b40;
}
.card-desc {
    font-size: 13px;
    color: #4a5068;
    line-height: 1.7;
    margin-bottom: 6px;
}
.card-tool {
    font-size: 12.5px;
    color: #5d6480;
    line-height: 1.65;
    margin-bottom: 6px;
}
.card-tool b {
    color: #6f5fe0;
}
.card-note {
    font-size: 12px;
    color: #98743e;
    line-height: 1.65;
    background: rgba(229, 165, 61, 0.10);
    border-radius: 8px;
    padding: 6px 9px;
}
/* 免责提示胶囊 */
.notice-wrap {
    display: flex;
    justify-content: center;
    padding: 2px 20px 48px;
}
.notice-pill {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    max-width: 92%;
    background: linear-gradient(90deg, #fdf4e3, #fbead0);
    border: 1px solid #f2ddba;
    border-radius: 999px;
    padding: 12px 26px;
    font-size: 13.5px;
    line-height: 1.6;
    color: #8a6a3a;
    box-shadow: 0 6px 16px rgba(210, 170, 110, 0.28);
}
.notice-ico {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #e5a53d;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
/* 轻量动效（纯 CSS，无外部库） */
@keyframes navSlide {
    from { transform: translateY(-100%); opacity: 0; }
    to   { transform: none; opacity: 1; }
}
@keyframes breathe {
    0%, 100% { box-shadow: 0 0 0 0 rgba(124,108,244,0); }
    50%      { box-shadow: 0 0 12px 2px rgba(124,108,244,0.5); }
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(26px); }
    to   { opacity: 1; transform: none; }
}
@keyframes pulseSoft {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.012); }
}
.header { animation: navSlide 0.6s ease-out both; }
.brand-logo { animation: breathe 2.8s ease-in-out infinite; }
.hero { animation: fadeUp 0.9s ease-out both; }
.section-title { animation: fadeUp 0.8s ease-out both; }
.section-sub { animation: fadeUp 0.8s ease-out 0.1s both; }
.feature-card { animation: fadeUp 0.8s ease-out backwards; }
.feature-card:nth-child(1) { animation-delay: 0.05s; }
.feature-card:nth-child(2) { animation-delay: 0.15s; }
.feature-card:nth-child(3) { animation-delay: 0.25s; }
.feature-card:nth-child(4) { animation-delay: 0.35s; }
.notice-pill { animation: fadeUp 0.8s ease-out backwards, pulseSoft 3.2s ease-in-out 1.4s infinite; }
/* 滚动到功能区再显现（支持的现代浏览器生效，不支持的直接显示） */
@supports (animation-timeline: view()) {
    .feature-card {
        animation: fadeUp 0.9s ease-out both;
        animation-timeline: view();
        animation-range: entry 0% entry 55%;
    }
    .notice-pill {
        animation: fadeUp 0.9s ease-out both, pulseSoft 3.2s ease-in-out infinite;
        animation-timeline: view(), auto;
        animation-range: entry 0% entry 60%;
    }
}
@media (prefers-reduced-motion: reduce) {
    .header, .brand-logo, .hero, .section-title, .section-sub,
    .feature-card, .notice-pill {
        animation: none !important;
        transition: none !important;
    }
}
@media (max-width: 768px) {
    .nav a { margin-left: 14px; font-size: 14px; }
    .nav a.active { padding: 6px 12px; }
    .section-title { font-size: 27px; }
    .feature-grid { grid-template-columns: 1fr; gap: 12px; }
    .notice-pill { font-size: 12.5px; border-radius: 18px; }
}
/* 文档页面（隐私、用户协议、关于）通用样式 */
.doc-page h1 {
    font-size:28px;
    color:#222733;
    margin-bottom:10px;
}
.doc-page h2 {
    font-size:20px;
    color:#2c3240;
    margin:32px 0 8px;
    padding-left:10px;
    border-left:3px solid #6388ff;
}
.doc-page p, .doc-page li {
    line-height:1.8;
    font-size:15px;
    color:#444955;
    margin:8px 0;
}
.doc-page ol, .doc-page ul {
    padding-left:24px;
    margin:10px 0;
}
/* 页脚 */
.footer {
    background:#f7f8fa;
    padding:24px 0;
    text-align:center;
    font-size:14px;
    color:#707582;
}
.footer a {
    color:#5b7cff;
    text-decoration:none;
}
.footer a.icp {
    color:#707582;
}
.footer a.icp:hover {
    color:#5b7cff;
}