:root {
    --bg-main: #f4f7f8;
    --bg-soft: #ebf3f4;
    --panel: #ffffff;
    --text-strong: #12212b;
    --text-body: #52606d;
    --primary: #229ed9;
    --secondary: #1e8b63;
    --line: #d9e4e8;
    --shadow: 0 10px 30px rgba(18, 33, 43, 0.08);
    --radius-lg: 8px;
    --radius-md: 8px;
    --radius-sm: 6px;
}

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

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-body);
    line-height: 1.7;
    background: var(--bg-main);
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1180px, calc(100% - 36px));
    margin: 0 auto;
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
}

.nav-wrap {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--primary);
    font-size: 22px;
    font-weight: 700;
}

.logo img {
    width: 34px;
    height: 34px;
}

.nav-links {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-strong);
    font-weight: 700;
    opacity: 0.85;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
    color: var(--primary);
    opacity: 1;
}

.hero,
.section {
    padding: 64px 0;
}

.hero-grid,
.split-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
    gap: 34px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    padding: 6px 10px;
    margin-bottom: 16px;
    border-radius: var(--radius-sm);
    background: #e6f5fb;
    color: var(--primary);
    font-weight: 700;
    font-size: 14px;
}

h1,
h2,
h3 {
    color: var(--text-strong);
    line-height: 1.15;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    margin-bottom: 16px;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 14px;
}

p {
    color: var(--text-body);
}

.hero-copy p,
.section-head p {
    font-size: 1.08rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 22px;
    border-radius: var(--radius-md);
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 10px 22px rgba(34, 158, 217, 0.18);
}

.btn-secondary {
    color: var(--secondary);
    background: #e8f6f0;
}

.btn-wide {
    width: 100%;
    min-height: 52px;
    font-size: 16px;
}

.hero-points,
.site-footer ul,
.faq-list {
    list-style: none;
}

.hero-points {
    display: grid;
    gap: 12px;
    margin-top: 24px;
}

.hero-points li,
.mini-list li {
    position: relative;
    padding-left: 22px;
}

.hero-points li::before,
.mini-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--primary);
}

.card,
.faq-item,
.notice-box,
.download-card,
.hero-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.hero-panel {
    display: flex;
    justify-content: flex-end;
}

.hero-card {
    width: 100%;
    max-width: 380px;
    padding: 32px;
}

.hero-icon {
    width: 72px;
    height: 72px;
    display: block;
    margin-bottom: 18px;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.tag {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--text-strong);
    background: #f8fbfc;
    font-size: 14px;
    font-weight: 600;
}

.section-soft {
    background: var(--bg-soft);
}

.section-head {
    max-width: 760px;
    margin-bottom: 34px;
}

.grid-3,
.download-grid,
.faq-grid {
    display: grid;
    gap: 22px;
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.download-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card,
.download-card,
.notice-box {
    padding: 28px;
}

.mini-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
    list-style: none;
}

.faq-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.faq-item {
    padding: 24px;
}

.site-footer {
    padding: 48px 0 24px;
    background: #15262f;
    color: rgba(255, 255, 255, 0.82);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 26px;
}

.site-footer h3,
.site-footer a:hover {
    color: #fff;
}

.site-footer ul {
    display: grid;
    gap: 10px;
}

.footer-bottom {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    font-size: 14px;
}

@media (max-width: 900px) {
    .hero-grid,
    .split-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .nav-wrap {
        padding: 14px 0;
        align-items: flex-start;
        flex-direction: column;
    }

    .hero,
    .section {
        padding: 48px 0;
    }

    .btn,
    .btn-wide {
        width: 100%;
    }
}