:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eef6ff;
    --text: #18263a;
    --muted: #637184;
    --line: #dce8f7;
    --white: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 14px 40px rgba(35, 92, 156, 0.10);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f2f8ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,247,0.85);
}

.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #163962;
    letter-spacing: 0.2px;
}

.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--white);
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0 12px;
    cursor: pointer;
}

.nav-toggle span {
    height: 2px;
    width: 100%;
    background: var(--primary-dark);
    border-radius: 99px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.site-nav.is-open {
    display: flex;
}

.site-nav a {
    padding: 11px 12px;
    color: #43536a;
    border-radius: 12px;
    font-size: 15px;
}

.site-nav a.active,
.site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.section,
.hero,
.page-hero {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}

.hero {
    padding: 42px 0 34px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    align-items: center;
}

.hero-content {
    display: grid;
    gap: 18px;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: #e8f3ff;
    border: 1px solid #cfe5ff;
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    color: #10253e;
    margin: 0;
}

h1 {
    font-size: clamp(32px, 9vw, 60px);
    letter-spacing: -1.2px;
}

h2 {
    font-size: clamp(26px, 6vw, 38px);
    margin-bottom: 14px;
}

h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

.lead {
    font-size: 17px;
    color: #4a5c73;
}

.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 4px 0 4px;
}

.hero-tags span,
.inline-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    color: #1f5fae;
    background: rgba(70,139,223,0.10);
    border: 1px solid rgba(70,139,223,0.20);
    font-size: 13px;
    font-weight: 700;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 148px;
    width: fit-content;
    padding: 13px 22px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--white);
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70,139,223,0.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 34px rgba(70,139,223,0.32);
}

.hero-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at 50% 20%, #dcebff 0%, rgba(220,235,255,0.65) 38%, rgba(255,255,255,0) 68%);
}

.hero-visual::before,
.hero-visual::after {
    content: '';
    position: absolute;
    border-radius: 999px;
    background: rgba(70,139,223,0.14);
    filter: blur(1px);
}

.hero-visual::before {
    width: 96px;
    height: 96px;
    left: 4%;
    top: 10%;
}

.hero-visual::after {
    width: 140px;
    height: 140px;
    right: 0;
    bottom: 12%;
}

.app-preview {
    width: min(280px, 78vw);
    border-radius: 34px;
    box-shadow: 0 30px 70px rgba(31,95,174,0.24);
    position: relative;
    z-index: 1;
}

.section {
    padding: 38px 0;
}

.section-heading {
    max-width: 760px;
    margin-bottom: 22px;
}

.card,
.info-card,
.faq-item,
.step-item {
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(220,232,247,0.95);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.card,
.info-card {
    padding: 22px;
}

.feature-grid,
.card-grid,
.steps-grid,
.faq-grid,
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.card-icon {
    width: 46px;
    height: 46px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    color: var(--primary-dark);
    background: linear-gradient(135deg, #e8f3ff, #ffffff);
    border: 1px solid #d6e9ff;
    font-weight: 900;
}

.split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: stretch;
}

.panel {
    padding: 24px;
    border-radius: 24px;
    background: linear-gradient(145deg, #ffffff, #eef6ff);
    border: 1px solid #dce8f7;
}

.stats-grid {
    margin-top: 12px;
}

.stat {
    padding: 18px;
    border-radius: 18px;
    background: rgba(70,139,223,0.08);
    border: 1px solid rgba(70,139,223,0.18);
}

.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 24px;
}

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    font-size: 18px;
}

.page-hero {
    padding: 42px 0 22px;
}

.page-hero-inner {
    display: grid;
    gap: 18px;
    padding: 28px;
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #eef6ff 100%);
    border: 1px solid #dce8f7;
    box-shadow: var(--shadow);
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.article-body {
    padding: 24px;
    border-radius: 26px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.note-box {
    padding: 20px;
    border-radius: 22px;
    background: #eef6ff;
    border: 1px solid #cfe5ff;
}

.note-box ul,
.article-body ul,
.article-body ol {
    margin: 10px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.note-box li,
.article-body li {
    margin: 8px 0;
}

.step-item {
    padding: 20px;
    display: flex;
    gap: 14px;
}

.step-number {
    flex: 0 0 38px;
    height: 38px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: var(--white);
    font-weight: 900;
}

.cta-band {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgb(70,139,223), #2b6ebe);
    color: var(--white);
    box-shadow: 0 20px 44px rgba(70,139,223,0.24);
}

.cta-band p,
.cta-band h2 {
    color: var(--white);
}

.site-footer {
    margin-top: 32px;
    padding: 34px 0;
    background: #10253e;
    color: #dce8f7;
}

.footer-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 20px;
}

.footer-brand {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 12px;
    align-items: center;
}

.footer-logo {
    width: 44px;
    height: 44px;
    border-radius: 14px;
}

.footer-brand p,
.copyright {
    color: #aebbd0;
    margin: 4px 0 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
}

.footer-links a {
    color: #dce8f7;
}

@media (min-width: 700px) {
    .feature-grid,
    .card-grid,
    .steps-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .stats-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .page-hero-inner {
        padding: 36px;
    }
}

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        background: transparent;
        border: none;
        border-radius: 0;
        box-shadow: none;
    }
    .site-nav a {
        padding: 8px 12px;
    }
    .hero {
        grid-template-columns: 1.04fr 0.96fr;
        padding: 72px 0 58px;
        gap: 44px;
    }
    .hero-visual {
        min-height: 500px;
    }
    .app-preview {
        width: 330px;
    }
    .section {
        padding: 56px 0;
    }
    .feature-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .split,
    .article-layout {
        grid-template-columns: 1.35fr 0.65fr;
        gap: 24px;
    }
    .footer-inner {
        grid-template-columns: 1.1fr 0.9fr;
        align-items: center;
    }
    .copyright {
        grid-column: 1 / -1;
    }
}