:root {
  --ink: #17223b;
  --muted: #627087;
  --line: #e7eaf0;
  --soft: #f7f8fb;
  --paper: #fffdfa;
  --white: #ffffff;
  --red: #ee4d50;
  --red-dark: #d83e42;
  --red-soft: #fff0ef;
  --teal: #15a99a;
  --navy: #14213f;
  --gold: #ffb642;
  --radius: 24px;
  --shadow: 0 18px 55px rgba(24, 34, 58, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; top: -80px; left: 20px; z-index: 99; padding: 10px 16px; border-radius: 10px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(226, 229, 236, .85); background: rgba(255, 253, 250, .9); backdrop-filter: blur(18px); }
.nav-wrap { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 800; line-height: 1.15; }
.brand img { border-radius: 11px; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; font-weight: 600; letter-spacing: .08em; }
.nav-links { display: flex; align-items: center; gap: 24px; color: #46536b; font-size: 14px; font-weight: 650; }
.nav-links a:hover { color: var(--red); }
.nav-links .nav-cta { padding: 10px 17px; border-radius: 999px; background: var(--red); color: #fff; box-shadow: 0 10px 25px rgba(238, 77, 80, .2); }

.hero { position: relative; overflow: hidden; padding: 82px 0 62px; background: radial-gradient(circle at 12% 15%, #fff0ed 0, transparent 34%), var(--paper); }
.hero::before { content: ""; position: absolute; inset: auto auto -170px -120px; width: 380px; height: 380px; border: 1px solid rgba(238, 77, 80, .16); border-radius: 50%; }
.hero-grid { display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 64px; }
.eyebrow, .section-kicker { color: var(--red); font-size: 12px; font-weight: 850; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { margin: 18px 0 22px; font-size: clamp(48px, 6.1vw, 80px); line-height: 1.06; letter-spacing: -.055em; }
.hero h1 span { color: var(--red); }
.hero-copy > p { max-width: 620px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 31px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 13px 21px; border: 1px solid transparent; border-radius: 14px; font-weight: 800; transition: .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--red); color: #fff; box-shadow: 0 13px 32px rgba(238, 77, 80, .24); }
.button-primary:hover { background: var(--red-dark); }
.button-secondary { border-color: var(--line); background: rgba(255,255,255,.85); }
.button-light { background: #fff; color: var(--navy); }
.hero-notes { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 25px; color: #536178; font-size: 12px; font-weight: 700; }
.hero-notes span::before { content: "✓"; margin-right: 7px; color: var(--teal); }
.hero-art { position: relative; border: 10px solid #fff; border-radius: 30px; box-shadow: 0 30px 75px rgba(32, 40, 60, .16); overflow: hidden; transform: rotate(1deg); }
.hero-art img { width: 100%; aspect-ratio: 1200/630; object-fit: cover; }
.hero-badge { position: absolute; left: 22px; bottom: 20px; display: grid; gap: 2px; padding: 12px 16px; border: 1px solid rgba(255,255,255,.75); border-radius: 14px; background: rgba(255,255,255,.86); box-shadow: 0 12px 26px rgba(25,35,57,.1); backdrop-filter: blur(12px); transform: rotate(-1deg); }
.hero-badge strong { font-size: 14px; }
.hero-badge span { color: var(--muted); font-size: 10px; font-weight: 700; }

.trust-strip { border-block: 1px solid var(--line); background: #fff; }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { padding: 26px 28px; border-right: 1px solid var(--line); }
.trust-item:first-child { border-left: 1px solid var(--line); }
.trust-item strong, .trust-item span { display: block; }
.trust-item strong { font-size: 17px; }
.trust-item span { margin-top: 4px; color: var(--muted); font-size: 12px; }

.rating-section { padding: 34px 0 0; }
.rating-card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; padding: 24px 30px; border: 1px solid #ffe0c3; border-radius: 20px; background: linear-gradient(110deg, #fff8eb, #fffefd); box-shadow: 0 12px 35px rgba(120, 81, 23, .06); }
.rating-score { display: flex; align-items: baseline; gap: 4px; min-width: 105px; color: var(--ink); }
.rating-score span { font-size: 42px; font-weight: 900; line-height: 1; }
.rating-score small { color: var(--muted); font-size: 15px; }
.stars { margin: 0; color: var(--gold); font-size: 17px; letter-spacing: .09em; }
.rating-card h2 { margin: 3px 0 1px; font-size: 17px; }
.rating-card p { margin-top: 0; margin-bottom: 0; color: var(--muted); font-size: 12px; }
.rating-card a { color: var(--red); text-decoration: underline; text-underline-offset: 3px; }
.rating-note { max-width: 280px; padding-left: 24px; border-left: 1px solid #ead9bf; }

.section { padding: 96px 0; }
.section-soft { background: var(--soft); }
.section-head { display: grid; grid-template-columns: 1fr minmax(300px, 500px); align-items: end; gap: 50px; margin-bottom: 38px; }
.section-kicker { margin: 0 0 8px; }
.section h2 { margin: 0; font-size: clamp(32px, 4vw, 48px); line-height: 1.2; letter-spacing: -.04em; }
.section-head > p { margin: 0; color: var(--muted); }

.download-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.download-card { position: relative; grid-column: span 2; min-height: 315px; display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; transition: .25s ease; }
.download-card:nth-child(4), .download-card:nth-child(5) { grid-column: span 3; min-height: 280px; }
.download-card:hover { transform: translateY(-5px); border-color: #f4b9b8; box-shadow: var(--shadow); }
.download-card.featured { border-color: #ffcecc; background: linear-gradient(145deg, #fff7f5, #fff); }
.platform-icon { width: 55px; height: 55px; display: grid; place-items: center; border-radius: 16px; background: var(--navy); color: #fff; font-size: 11px; font-weight: 900; letter-spacing: .04em; }
.download-card:nth-child(2) .platform-icon { background: #333; }
.download-card:nth-child(3) .platform-icon { background: #664ed0; }
.download-card:nth-child(4) .platform-icon { background: var(--teal); }
.download-card:nth-child(5) .platform-icon { background: #3186e8; }
.card-tag { position: absolute; top: 24px; right: 24px; padding: 5px 10px; border-radius: 999px; background: var(--red-soft); color: var(--red); font-size: 10px; font-weight: 850; }
.download-card h3 { margin: 22px 0 8px; font-size: 20px; }
.download-card p { margin: 0; color: var(--muted); font-size: 14px; }
.card-meta { margin-top: 14px; color: #8a94a6; font-size: 11px; font-weight: 700; }
.card-link { display: flex; justify-content: space-between; margin-top: auto; padding-top: 20px; color: var(--red); font-size: 13px; font-weight: 850; }
.source-note { display: flex; gap: 15px; margin-top: 25px; padding: 20px 23px; border: 1px solid #cde9e4; border-radius: 16px; background: #f2fbf9; color: #4f6661; font-size: 13px; }
.source-note > span { flex: 0 0 30px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--teal); color: #fff; font-weight: 900; }

.module-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 17px; }
.module-card { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.module-letter { width: 52px; height: 52px; display: grid; place-items: center; border-radius: 14px; color: #fff; font-weight: 900; }
.writer .module-letter { background: #3978dc; }
.sheets .module-letter { background: #0ca677; }
.slides .module-letter { background: #ed6542; }
.pdf .module-letter { background: #ea4050; font-size: 11px; }
.module-card h3 { margin: 21px 0 8px; font-size: 18px; }
.module-card p { color: var(--muted); font-size: 13px; }
.module-card ul { margin: 18px 0 0; padding: 18px 0 0; border-top: 1px solid var(--line); list-style: none; }
.module-card li { color: #48566d; font-size: 12px; }
.module-card li::before { content: "•"; margin-right: 7px; color: var(--red); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.feature-grid article { min-height: 235px; padding: 32px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid article:nth-child(3n) { border-right: 0; }
.feature-grid article:nth-child(n+4) { border-bottom: 0; }
.feature-grid span { color: var(--red); font-size: 11px; font-weight: 900; }
.feature-grid h3 { margin: 45px 0 8px; font-size: 19px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.requirements-grid { display: grid; grid-template-columns: 1.45fr .75fr; gap: 22px; }
.requirements-table { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.requirements-table div { display: grid; grid-template-columns: 190px 1fr; gap: 30px; padding: 21px 26px; border-bottom: 1px solid var(--line); }
.requirements-table div:last-child { border: 0; }
.requirements-table span { color: var(--muted); font-size: 13px; }
.requirements-table strong { font-size: 14px; }
.requirements-aside { padding: 34px; border-radius: var(--radius); background: var(--navy); color: #fff; }
.aside-label, .security-badge { display: inline-block; padding: 6px 10px; border-radius: 999px; background: rgba(255,255,255,.12); font-size: 10px; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.requirements-aside h3 { margin: 50px 0 12px; font-size: 25px; line-height: 1.3; }
.requirements-aside p { color: #c0c8d8; font-size: 13px; }
.requirements-aside a { display: inline-block; margin-top: 20px; color: #fff; font-size: 13px; font-weight: 850; }

.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 13px; }
.steps article { position: relative; min-height: 240px; padding: 26px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.steps article:not(:last-child)::after { content: "→"; position: absolute; z-index: 2; top: 44px; right: -18px; width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); color: var(--red); font-weight: 900; }
.steps span { color: var(--red); font-size: 30px; font-weight: 900; opacity: .28; }
.steps h3 { margin: 44px 0 10px; font-size: 17px; }
.steps p { margin: 0; color: var(--muted); font-size: 12px; }

.section-dark { background: var(--navy); color: #fff; }
.security-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; align-items: center; }
.security-grid h2 { margin-top: 20px; }
.security-grid > div:first-child > p { color: #b7c1d3; }
.security-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.security-list article { display: flex; gap: 13px; padding: 22px; border: 1px solid rgba(255,255,255,.12); border-radius: 18px; background: rgba(255,255,255,.05); }
.security-list article > span { flex: 0 0 27px; width: 27px; height: 27px; display: grid; place-items: center; border-radius: 50%; background: var(--teal); font-size: 12px; font-weight: 900; }
.security-list h3 { margin: 0 0 6px; font-size: 15px; }
.security-list p { margin: 0; color: #aeb9cb; font-size: 12px; }

.scenario-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.scenario-grid article { min-height: 235px; padding: 29px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(155deg, #fff, #fbfbfd); }
.scenario-grid span { display: inline-block; padding: 5px 10px; border-radius: 999px; background: var(--red-soft); color: var(--red); font-size: 10px; font-weight: 850; }
.scenario-grid h3 { margin: 58px 0 10px; font-size: 18px; }
.scenario-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.faq-list { max-width: 920px; margin: 0 auto; }
.faq-list details { border-bottom: 1px solid var(--line); background: transparent; }
.faq-list summary { position: relative; padding: 23px 52px 23px 0; cursor: pointer; list-style: none; font-size: 16px; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; top: 19px; right: 5px; width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--red); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: 0; padding: 0 52px 22px 0; color: var(--muted); font-size: 14px; }

.resource-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.resource-grid a { display: flex; justify-content: space-between; padding: 22px 24px; border: 1px solid var(--line); border-radius: 16px; background: #fff; font-size: 14px; font-weight: 800; transition: .2s ease; }
.resource-grid a:hover { border-color: #f4b9b8; color: var(--red); transform: translateY(-2px); }

.final-cta { padding: 24px 0 80px; }
.cta-panel { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 50px 56px; border-radius: 30px; background: linear-gradient(125deg, #ed4b4e, #db3439); color: #fff; box-shadow: 0 28px 65px rgba(218, 49, 54, .2); }
.cta-panel span { font-size: 11px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.cta-panel h2 { max-width: 720px; margin: 8px 0 4px; font-size: clamp(30px, 4vw, 47px); line-height: 1.2; letter-spacing: -.04em; }
.cta-panel p { margin: 0; color: #ffe5e4; }

.site-footer { padding: 62px 0 28px; background: #10192e; color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.8fr .7fr .7fr; gap: 70px; }
.footer-grid > div:first-child p { max-width: 620px; margin-top: 20px; color: #94a0b6; font-size: 12px; }
.footer-grid h3 { margin: 0 0 16px; font-size: 13px; }
.footer-grid > div:not(:first-child) a { display: block; margin: 8px 0; color: #9ca8bb; font-size: 12px; }
.footer-grid > div:not(:first-child) a:hover { color: #fff; }
.site-footer .brand small { color: #8591a8; }
.copyright { margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.1); color: #738198; font-size: 11px; }

@media (max-width: 1050px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-copy { max-width: 760px; }
  .hero-art { max-width: 860px; }
  .module-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .steps article:not(:last-child)::after { display: none; }
  .security-grid { gap: 50px; }
}

@media (max-width: 780px) {
  .container { width: min(100% - 28px, 1180px); }
  .site-header { position: relative; }
  .nav-wrap { min-height: 68px; }
  .nav-links { display: none; }
  .hero { padding: 58px 0 42px; }
  .hero h1 { font-size: clamp(42px, 13vw, 62px); }
  .hero-copy > p { font-size: 16px; }
  .hero-art { border-width: 6px; border-radius: 22px; transform: none; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-item:nth-child(2) { border-right: 0; }
  .rating-card { grid-template-columns: auto 1fr; padding: 22px; }
  .rating-note { grid-column: 1 / -1; max-width: none; padding: 15px 0 0; border-left: 0; border-top: 1px solid #ead9bf; }
  .section { padding: 72px 0; }
  .section-head { grid-template-columns: 1fr; gap: 16px; }
  .download-grid { grid-template-columns: 1fr; }
  .download-card, .download-card:nth-child(4), .download-card:nth-child(5) { grid-column: auto; min-height: 270px; }
  .module-grid, .feature-grid, .scenario-grid, .resource-grid { grid-template-columns: 1fr; }
  .feature-grid article, .feature-grid article:nth-child(3n), .feature-grid article:nth-child(n+4) { border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-grid article:last-child { border-bottom: 0; }
  .requirements-grid, .security-grid { grid-template-columns: 1fr; }
  .requirements-table div { grid-template-columns: 1fr; gap: 5px; }
  .steps { grid-template-columns: 1fr; }
  .security-list { grid-template-columns: 1fr; }
  .cta-panel { align-items: flex-start; flex-direction: column; padding: 38px 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 38px; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .button { width: 100%; }
  .hero-notes { display: grid; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-item, .trust-item:first-child { border-left: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .rating-card { grid-template-columns: 1fr; }
  .rating-note { grid-column: auto; }
  .module-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid > div:first-child { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}