:root {
    --bg-main: linear-gradient(135deg, #eef6ff 0%, #f7fbff 55%, #ffffff 100%);
    --bg-soft: linear-gradient(135deg, #f4f9ff 0%, #ffffff 100%);
    --panel: rgba(255, 255, 255, 0.92);
    --card: #ffffff;
    --text-strong: #18354f;
    --text-body: #5e7183;
    --primary: #229ed9;
    --accent: #3556f5;
    --line: rgba(34, 158, 217, 0.12);
    --shadow: 0 20px 50px rgba(31, 78, 112, 0.12);
    --radius-lg: 26px;
    --radius-md: 18px;
    --radius-sm: 12px;
}

* {
    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;
    backdrop-filter: blur(14px);
    background: rgba(255, 255, 255, 0.82);
    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: 24px;
    font-weight: 800;
}

.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: 76px 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: 7px 14px;
    margin-bottom: 16px;
    border-radius: 999px;
    background: rgba(34, 158, 217, 0.12);
    color: var(--primary);
    font-weight: 800;
    font-size: 14px;
    letter-spacing: 0.04em;
}

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

h1 {
    font-size: clamp(2.6rem, 6vw, 4.4rem);
    margin-bottom: 18px;
}

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: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 58px;
    padding: 0 30px;
    border-radius: 999px;
    font-weight: 800;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 16px 34px rgba(34, 158, 217, 0.24);
}

.btn-secondary {
    color: var(--primary);
    background: rgba(34, 158, 217, 0.1);
}

.btn-wide {
    width: 100%;
    min-height: 60px;
    font-size: 18px;
}

.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: linear-gradient(135deg, var(--primary), var(--accent));
}

.visual-box,
.metric-box,
.card,
.faq-item,
.notice-box,
.download-card {
    background: var(--panel);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.visual-box {
    min-height: 360px;
    padding: 28px;
    position: relative;
    overflow: hidden;
}

.visual-box::before,
.visual-box::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(34, 158, 217, 0.18), rgba(53, 86, 245, 0.08));
}

.visual-box::before {
    width: 210px;
    height: 210px;
    right: -30px;
    top: -30px;
}

.visual-box::after {
    width: 160px;
    height: 160px;
    left: 24px;
    bottom: -34px;
}

.visual-stack {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 16px;
}

.bubble {
    padding: 18px 20px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}

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

.card-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: rgba(34, 158, 217, 0.12);
    font-size: 28px;
}

.mini-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

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

.faq-item {
    padding: 24px;
}

.site-footer {
    padding: 48px 0 24px;
    background: #173246;
    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: 58px 0;
    }

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