:root {
    --ink: #102f35;
    --muted: #5d7679;
    --paper: #f7fbf8;
    --mint: #dff4ed;
    --mint-strong: #9edecb;
    --wind: #3b9c94;
    --coral: #ef846a;
    --sun: #f4bd66;
    --line: #cfe4dd;
    --white: #ffffff;
    --shadow: 0 18px 50px rgba(20, 69, 68, .12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--coral); }

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(247, 251, 248, .94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}

.nav-wrap {
    width: min(1160px, calc(100% - 40px));
    min-height: 76px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    letter-spacing: .04em;
    white-space: nowrap;
}

.brand img { width: 42px; height: 42px; object-fit: cover; border-radius: 12px; border: 1px solid var(--line); }
.brand-name { font-size: 18px; }
.brand-sub { display: block; color: var(--muted); font-size: 10px; letter-spacing: .16em; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; color: var(--muted); }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; }
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--ink); border-color: var(--coral); }

.nav-download, .button-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 20px;
    border: 0;
    border-radius: 999px;
    color: var(--white);
    background: var(--ink);
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(16, 47, 53, .18);
    transition: transform .2s ease, background .2s ease;
}
.nav-download:hover, .button-primary:hover { color: var(--white); background: var(--coral); transform: translateY(-2px); }

.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 19px;
    border: 1px solid var(--ink);
    border-radius: 999px;
    color: var(--ink);
    font-size: 14px;
    font-weight: 700;
}
.button-secondary:hover { color: var(--ink); border-color: var(--coral); background: #fff3ee; }

.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 92px 0; }
.section-tight { padding: 64px 0; }
.eyebrow { margin: 0 0 12px; color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; }
h1 { margin-bottom: 22px; font-size: clamp(38px, 6vw, 70px); max-width: 640px; }
h2 { margin-bottom: 22px; font-size: clamp(28px, 4vw, 46px); }
h3 { margin-bottom: 10px; font-size: 20px; }
.lead { max-width: 650px; color: var(--muted); font-size: 18px; }

.hero { padding: 82px 0 72px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 72px; }
.hero-copy { position: relative; }
.hero-copy::before { content: ""; position: absolute; left: -70px; top: 4px; width: 10px; height: 170px; background: var(--sun); border-radius: 12px; transform: rotate(9deg); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0; }
.chip { display: inline-flex; align-items: center; min-height: 30px; padding: 0 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--white); font-size: 12px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-art { position: relative; min-height: 480px; display: grid; place-items: center; }
.hero-art::before { content: ""; position: absolute; width: 370px; height: 370px; border-radius: 50%; border: 1px solid var(--mint-strong); background: var(--mint); }
.hero-card { position: relative; width: min(330px, 85%); padding: 14px; border: 1px solid var(--line); border-radius: 26px; background: var(--white); box-shadow: var(--shadow); transform: rotate(4deg); }
.hero-card img { width: 100%; max-height: 420px; object-fit: cover; border-radius: 16px; }
.hero-sticker { position: absolute; right: -25px; bottom: 48px; width: 120px; padding: 15px 14px; border: 1px solid #e8c27e; border-radius: 16px; color: var(--ink); background: var(--sun); font-size: 12px; font-weight: 800; line-height: 1.35; transform: rotate(-8deg); }

.signal-bar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--white); }
.signal-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.signal-item { padding: 22px 20px; border-right: 1px solid var(--line); }
.signal-item:last-child { border-right: 0; }
.signal-value { display: block; color: var(--ink); font-size: 23px; font-weight: 800; }
.signal-label { color: var(--muted); font-size: 12px; }

.section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section-head p { max-width: 480px; margin-bottom: 0; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card { min-height: 220px; padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: var(--white); }
.feature-card:nth-child(2) { background: #fff4ee; border-color: #f5c9b8; transform: translateY(22px); }
.feature-card:nth-child(3) { background: #edf8f3; }
.feature-index { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; margin-bottom: 32px; border-radius: 50%; color: var(--white); background: var(--wind); font-size: 12px; font-weight: 800; }
.feature-card:nth-child(2) .feature-index { background: var(--coral); }
.feature-card:nth-child(3) .feature-index { background: var(--sun); color: var(--ink); }
.feature-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }

.visual-layout { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: 60px; }
.visual-note { padding-top: 10px; }
.visual-note p { color: var(--muted); }
.visual-note ul { margin: 24px 0 0; padding: 0; list-style: none; }
.visual-note li { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.visual-note li::before { content: "↗"; margin-right: 10px; color: var(--coral); font-weight: 800; }
.visual-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; align-items: start; }
.visual-frame { margin: 0; padding: 10px; border: 1px solid var(--line); border-radius: 17px; background: var(--white); box-shadow: 0 10px 25px rgba(20, 69, 68, .07); }
.visual-frame:nth-child(2) { margin-top: 42px; }
.visual-frame:nth-child(3) { margin-top: 84px; }
.visual-frame img { width: 100%; max-width: 400px; max-height: 300px; object-fit: cover; border-radius: 10px; }
.visual-frame figcaption { padding: 10px 2px 2px; color: var(--muted); font-size: 11px; }

.deep-section { background: var(--ink); color: var(--white); }
.deep-section .eyebrow { color: var(--sun); }
.deep-section .section-head p { color: #b6d1cb; }
.deep-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.deep-card { display: flex; align-items: end; justify-content: space-between; min-height: 190px; padding: 26px; border: 1px solid rgba(223, 244, 237, .25); border-radius: 18px; background: rgba(255, 255, 255, .07); }
.deep-card h3 { max-width: 240px; margin-bottom: 6px; }
.deep-card p { max-width: 310px; margin-bottom: 0; color: #b6d1cb; font-size: 14px; }
.deep-arrow { display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid var(--mint-strong); border-radius: 50%; color: var(--mint-strong); font-size: 21px; }

.review-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.review-card { padding: 24px; border-top: 3px solid var(--coral); background: var(--white); }
.review-card:nth-child(2) { border-color: var(--wind); }
.review-card:nth-child(3) { border-color: var(--sun); }
.review-card blockquote { margin: 0 0 18px; font-size: 16px; }
.review-card cite { color: var(--muted); font-size: 12px; font-style: normal; }

.cta-band { padding: 70px 0; background: var(--mint); }
.cta-box { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta-box h2 { max-width: 590px; margin-bottom: 0; }

.page-hero { padding: 74px 0 62px; border-bottom: 1px solid var(--line); background: var(--mint); }
.page-hero h1 { max-width: 760px; font-size: clamp(36px, 5vw, 58px); }
.page-hero p { max-width: 700px; color: var(--muted); font-size: 17px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 72px; }
.article-content { max-width: 760px; }
.article-content h2 { margin-top: 48px; font-size: 30px; }
.article-content h3 { margin-top: 30px; font-size: 21px; }
.article-content p { color: #3f5b5d; }
.article-content ul, .article-content ol { padding-left: 22px; color: #3f5b5d; }
.article-content li { margin-bottom: 10px; }
.note-box { margin: 30px 0; padding: 20px 22px; border-left: 4px solid var(--coral); background: #fff3ee; color: #5a4e4a; }
.article-aside { position: sticky; top: 102px; align-self: start; padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--white); }
.article-aside h3 { font-size: 17px; }
.article-aside a { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.article-aside a:last-child { border-bottom: 0; }

.faq-list { margin: 0; padding: 0; list-style: none; }
.faq-item { padding: 20px 0; border-bottom: 1px solid var(--line); }
.faq-item h3 { display: flex; gap: 12px; margin-bottom: 8px; font-size: 19px; }
.faq-item h3::before { content: "Q"; display: inline-grid; flex: 0 0 28px; height: 28px; place-items: center; border-radius: 50%; color: var(--white); background: var(--wind); font-size: 12px; }
.faq-item p { margin-left: 40px; margin-bottom: 0; }

.site-footer { padding: 42px 0 28px; color: #b6d1cb; background: #0a2429; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 40px; padding-bottom: 34px; border-bottom: 1px solid rgba(223, 244, 237, .2); }
.site-footer .brand { color: var(--white); }
.site-footer .brand-sub { color: #8eb2aa; }
.site-footer h3 { color: var(--white); font-size: 15px; }
.site-footer p, .site-footer a { color: #b6d1cb; font-size: 13px; }
.footer-links a { display: block; margin-bottom: 7px; }
.disclaimer { margin: 22px 0 0; color: #8eb2aa; font-size: 12px; }
.copyright { margin: 20px 0 0; color: #71928c; font-size: 11px; }

@media (max-width: 900px) {
    .nav-wrap { min-height: 68px; }
    .nav-links { gap: 13px; }
    .nav-download { display: none; }
    .hero-grid, .visual-layout, .article-layout { grid-template-columns: 1fr; gap: 42px; }
    .hero { padding-top: 60px; }
    .hero-art { min-height: 390px; }
    .article-aside { position: static; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
    .container, .nav-wrap { width: min(100% - 28px, 1160px); }
    .nav-wrap { flex-wrap: wrap; padding: 9px 0 6px; gap: 4px; }
    .nav-links { display: grid; grid-template-columns: repeat(3, max-content); flex: 0 0 100%; width: 100%; max-width: 360px; justify-content: space-between; gap: 10px; font-size: 12px; }
    .nav-links a { padding: 5px 0; }
    .brand-sub { display: none; }
    .brand-name { font-size: 16px; }
    .section { padding: 66px 0; }
    .section-head, .cta-box { display: block; }
    .section-head p { margin-top: 14px; }
    .signal-grid { grid-template-columns: repeat(2, 1fr); }
    .signal-item:nth-child(2) { border-right: 0; }
    .signal-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
    .feature-grid, .deep-grid, .review-grid, .visual-grid { grid-template-columns: 1fr; }
    .feature-card:nth-child(2), .visual-frame:nth-child(2), .visual-frame:nth-child(3) { transform: none; margin-top: 0; }
    .visual-frame img { max-height: 340px; margin: 0 auto; }
    .cta-box .button-primary { margin-top: 20px; }
    .footer-grid { grid-template-columns: 1fr; gap: 22px; }
    h1 { font-size: 42px; }
}