:root {
  color-scheme: dark;
  --bg: #030814;
  --panel: rgba(10, 20, 42, 0.72);
  --panel-strong: #091329;
  --line: rgba(138, 176, 255, 0.16);
  --text: #f5f8ff;
  --muted: #9aa9c7;
  --cyan: #20d8ff;
  --blue: #387dff;
  --violet: #8b4cff;
  --shell: min(1180px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 8% 12%, rgba(0, 156, 255, .12), transparent 31%),
    radial-gradient(circle at 92% 22%, rgba(112, 34, 255, .14), transparent 34%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.section-shell { width: var(--shell); margin-inline: auto; }
.site-glow { position: fixed; z-index: -1; width: 420px; height: 420px; border-radius: 50%; filter: blur(120px); opacity: .12; pointer-events: none; }
.site-glow-a { left: -220px; top: 28vh; background: var(--cyan); }
.site-glow-b { right: -240px; top: 58vh; background: var(--violet); }

.site-header {
  position: sticky; top: 0; z-index: 50;
  width: 100%; height: 82px; padding: 0 max(24px, calc((100vw - 1180px)/2));
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(3, 8, 20, .72); border-bottom: 1px solid rgba(160, 190, 255, .1);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 680; letter-spacing: .08em; }
.brand-mark { position: relative; width: 38px; height: 38px; border: 1px solid rgba(58, 180, 255, .6); border-radius: 12px; background: linear-gradient(145deg, rgba(14, 83, 154, .45), rgba(81, 25, 157, .55)); box-shadow: 0 0 24px rgba(40, 159, 255, .25); overflow: hidden; }
.brand-mark i { position: absolute; inset: 8px 7px; border: 2px solid var(--cyan); border-block-color: transparent; border-radius: 50%; transform: skewX(-8deg); filter: drop-shadow(0 0 6px var(--cyan)); }
.brand-mark i:last-child { border-color: var(--violet); border-block-color: transparent; transform: rotate(180deg) skewX(-8deg); }
.site-nav { display: flex; align-items: center; gap: 34px; color: #b6c2d9; font-size: 14px; }
.site-nav a { transition: color .25s, transform .25s; }
.site-nav a:hover { color: #fff; transform: translateY(-1px); }
.site-nav .nav-cta { padding: 11px 18px; color: #fff; border: 1px solid rgba(103, 163, 255, .3); border-radius: 999px; background: linear-gradient(120deg, rgba(25, 125, 255, .22), rgba(126, 59, 255, .18)); }
.menu-button { display: none; border: 0; background: none; padding: 10px; }
.menu-button span { display: block; width: 24px; height: 1px; margin: 6px; background: #fff; }

.hero { min-height: 760px; padding: 90px 0 70px; display: grid; grid-template-columns: .95fr 1.05fr; align-items: center; gap: 68px; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 24px; color: #91a6cd; font-size: 12px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; }
.eyebrow > span { width: 27px; height: 1px; background: linear-gradient(90deg, var(--cyan), var(--violet)); box-shadow: 0 0 8px var(--cyan); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 28px; font-size: clamp(48px, 6vw, 82px); font-weight: 640; line-height: 1.12; letter-spacing: -.055em; }
h1 em, h2 em { color: transparent; font-style: normal; background: linear-gradient(100deg, #fff 10%, #aadaff 48%, #ad87ff 92%); -webkit-background-clip: text; background-clip: text; filter: drop-shadow(0 0 18px rgba(89, 169, 255, .18)); }
.hero-intro { max-width: 570px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.search-box { max-width: 600px; margin-top: 36px; padding: 8px 8px 8px 19px; display: flex; align-items: center; gap: 11px; border: 1px solid rgba(138, 176, 255, .22); border-radius: 17px; background: rgba(9, 19, 41, .75); box-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 20px 60px rgba(0,0,0,.2); }
.search-box:focus-within { border-color: rgba(53, 208, 255, .62); box-shadow: 0 0 0 3px rgba(32, 216, 255, .08); }
.search-box svg { width: 20px; fill: none; stroke: #7588aa; stroke-width: 1.7; }
.search-box input { min-width: 0; flex: 1; padding: 11px 0; color: #fff; border: 0; outline: 0; background: none; }
.search-box input::placeholder { color: #657594; }
.search-box button { padding: 12px 18px; color: #fff; border: 0; border-radius: 12px; background: linear-gradient(130deg, #167bff, #7353ff); cursor: pointer; box-shadow: 0 8px 24px rgba(55, 105, 255, .28); }
.search-feedback { min-height: 21px; margin: 9px 0 0; color: #77dfff; font-size: 13px; }
.response-note { display: flex; align-items: center; gap: 8px; margin-top: 14px; color: #7789aa; font-size: 12px; }
.response-note span { width: 6px; height: 6px; border-radius: 50%; background: #42f5c0; box-shadow: 0 0 9px #42f5c0; }

.hero-visual { position: relative; min-height: 620px; display: grid; place-items: center; }
.visual-halo { position: absolute; inset: 14% 4% 8%; background: radial-gradient(circle, rgba(46, 172, 255, .25), transparent 47%), radial-gradient(circle at 75% 55%, rgba(131, 56, 255, .24), transparent 45%); filter: blur(20px); }
.hero-image-frame { position: relative; z-index: 1; width: min(475px, 100%); margin: 0; overflow: hidden; aspect-ratio: .8; border: 1px solid rgba(134, 179, 255, .28); border-radius: 38px; transform: perspective(1200px) rotateY(-4deg) rotateX(1deg); box-shadow: 0 40px 100px rgba(0,0,0,.48), -16px 12px 60px rgba(0,159,255,.16), 16px 8px 60px rgba(125,41,255,.13); }
.hero-image-frame::after { content: ""; position: absolute; inset: 0; background: linear-gradient(120deg, rgba(255,255,255,.12), transparent 24%, transparent 76%, rgba(128,74,255,.12)); pointer-events: none; }
.hero-image-frame img { width: 100%; height: 100%; object-fit: cover; }
.floating-chip { position: absolute; z-index: 3; min-width: 126px; padding: 13px 16px; border: 1px solid rgba(145, 187, 255, .22); border-radius: 16px; background: rgba(5, 15, 36, .74); backdrop-filter: blur(16px); box-shadow: 0 18px 45px rgba(0,0,0,.35); }
.floating-chip b, .floating-chip span { display: block; }
.floating-chip b { margin-bottom: 3px; font-size: 15px; }
.floating-chip span { color: #8192b2; font-size: 11px; }
.floating-chip-a { left: -2%; top: 22%; }
.floating-chip-b { right: -1%; bottom: 17%; }

.support-strip { width: 100%; display: grid; grid-template-columns: repeat(4,1fr); border-block: 1px solid var(--line); background: rgba(7,16,34,.5); }
.support-strip div { min-height: 104px; display: flex; align-items: center; justify-content: center; gap: 14px; border-right: 1px solid var(--line); }
.support-strip div:last-child { border-right: 0; }
.support-strip strong { color: #59709b; font-size: 11px; letter-spacing: .1em; }
.support-strip span { font-size: 14px; color: #c7d2e7; }

.guides, .showcase { padding-block: 132px; }
.section-heading { max-width: 670px; margin-bottom: 50px; }
.section-heading h2, .feature h2, .privacy h2, .contact h2 { margin-bottom: 22px; font-size: clamp(38px, 5vw, 64px); line-height: 1.1; letter-spacing: -.045em; }
.section-heading > p:last-child, .feature-copy > p, .privacy-intro > p, .contact-panel > div > p:last-child { color: var(--muted); line-height: 1.85; }
.topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.topic-card { position: relative; min-height: 300px; padding: 28px; overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: linear-gradient(160deg, rgba(14, 28, 58, .78), rgba(6, 13, 29, .82)); transition: transform .35s, border-color .35s, box-shadow .35s; }
.topic-card::before { content: ""; position: absolute; width: 150px; height: 150px; right: -90px; top: -90px; border-radius: 50%; background: var(--cyan); filter: blur(70px); opacity: .12; transition: opacity .35s; }
.topic-card:nth-child(2)::before, .topic-card:nth-child(4)::before { background: var(--violet); }
.topic-card:hover, .topic-card.search-hit { transform: translateY(-7px); border-color: rgba(74, 188, 255, .48); box-shadow: 0 28px 70px rgba(0,0,0,.25); }
.topic-card:hover::before, .topic-card.search-hit::before { opacity: .3; }
.topic-index { display: inline-grid; place-items: center; width: 46px; height: 46px; color: #8fcfff; border: 1px solid rgba(69, 180, 255, .24); border-radius: 14px; background: rgba(27, 93, 170, .16); }
.topic-tag { position: absolute; right: 25px; top: 29px; color: #7285a9; font-size: 11px; letter-spacing: .1em; }
.topic-card h3 { margin: 45px 0 12px; font-size: 21px; }
.topic-card p { min-height: 48px; color: #8697b7; font-size: 14px; line-height: 1.7; }
.topic-card button { padding: 0; color: #9bb8ea; border: 0; background: none; cursor: pointer; font-size: 13px; }
.topic-card button span { margin-left: 5px; color: var(--cyan); }

.feature { padding: 40px 0 130px; display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: 92px; }
.feature-image { position: relative; }
.feature-image img { width: 100%; max-height: 660px; object-fit: cover; border: 1px solid rgba(98, 160, 255, .23); border-radius: 28px; box-shadow: 0 32px 90px rgba(0,0,0,.38); }
.feature-image > span { position: absolute; left: 25px; bottom: 23px; padding: 9px 12px; border-radius: 999px; color: #a9b8d1; background: rgba(3,8,20,.72); backdrop-filter: blur(12px); font-size: 9px; letter-spacing: .18em; }
.feature-copy > p { max-width: 500px; }
.feature-points { margin-top: 38px; border-top: 1px solid var(--line); }
.feature-points div { padding: 19px 0; display: grid; grid-template-columns: 74px 1fr; border-bottom: 1px solid var(--line); }
.feature-points b { color: #dfe8fa; font-size: 14px; }
.feature-points span { color: #7d8dad; font-size: 13px; }

.showcase { border-top: 1px solid var(--line); }
.showcase-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 18px; }
.showcase-main { position: relative; min-height: 650px; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 28px; background: #050b19; }
.showcase-main img { width: 100%; height: 100%; object-fit: cover; object-position: center 38%; }
.showcase-main::after { content: ""; position: absolute; inset: 50% 0 0; background: linear-gradient(transparent, rgba(1,5,14,.86)); }
.showcase-main figcaption { position: absolute; z-index: 2; left: 30px; right: 30px; bottom: 27px; display: flex; align-items: center; gap: 14px; font-size: 17px; }
.showcase-main figcaption span { color: #65dfff; font-size: 11px; }
.showcase-copy { padding: 45px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--line); border-radius: 28px; background: linear-gradient(155deg, rgba(16,30,63,.8), rgba(7,14,30,.9)); }
.showcase-copy > p { font-size: clamp(25px, 3vw, 39px); line-height: 1.5; letter-spacing: -.025em; }
.showcase-copy dl { margin: 0; }
.showcase-copy dl div { padding: 18px 0; display: grid; grid-template-columns: 70px 1fr; border-top: 1px solid var(--line); }
.showcase-copy dt { color: #6f82a6; font-size: 12px; }
.showcase-copy dd { margin: 0; color: #c2cde1; font-size: 13px; }

.privacy { padding-block: 130px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; border-top: 1px solid var(--line); }
.privacy-intro { align-self: start; position: sticky; top: 125px; }
.privacy-intro > a { display: inline-flex; margin-top: 20px; color: #82b8ff; font-size: 13px; }
.accordion { border-top: 1px solid var(--line); }
.accordion article { border-bottom: 1px solid var(--line); }
.accordion button { width: 100%; padding: 25px 4px; display: grid; grid-template-columns: 55px 1fr 20px; align-items: center; text-align: left; color: #e6ecf8; border: 0; background: none; cursor: pointer; }
.accordion button span { color: #597099; font-size: 11px; }
.accordion button i { position: relative; width: 16px; height: 16px; }
.accordion button i::before, .accordion button i::after { content: ""; position: absolute; left: 1px; top: 7px; width: 14px; height: 1px; background: #9eb0ce; transition: transform .25s; }
.accordion button i::after { transform: rotate(90deg); }
.accordion button[aria-expanded="true"] i::after { transform: rotate(0); }
.accordion-panel { padding: 0 30px 25px 59px; color: #8fa0bd; font-size: 14px; line-height: 1.85; }

.contact { padding: 70px 0 130px; }
.contact-panel { position: relative; padding: 68px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; overflow: hidden; border: 1px solid rgba(109, 168, 255, .25); border-radius: 32px; background: linear-gradient(135deg, rgba(12, 36, 72, .9), rgba(23, 11, 58, .82)); box-shadow: 0 40px 100px rgba(0,0,0,.26); }
.contact-panel::before { content: ""; position: absolute; width: 400px; height: 400px; left: -150px; bottom: -250px; border-radius: 50%; background: var(--cyan); opacity: .1; filter: blur(70px); }
.contact-form { position: relative; z-index: 1; }
.contact-form label { display: block; margin: 15px 0 8px; color: #9cadc8; font-size: 12px; }
.contact-form label:first-child { margin-top: 0; }
.contact-form input, .contact-form textarea { width: 100%; padding: 15px 16px; color: #fff; border: 1px solid rgba(150,180,240,.2); border-radius: 13px; outline: 0; resize: vertical; background: rgba(2,8,21,.48); }
.contact-form input:focus, .contact-form textarea:focus { border-color: rgba(57,207,255,.6); box-shadow: 0 0 0 3px rgba(32,216,255,.07); }
.contact-form button { margin-top: 17px; padding: 15px 20px; color: #fff; border: 0; border-radius: 13px; background: linear-gradient(125deg,#147eff,#704cff); cursor: pointer; }
.contact-form button span { margin-left: 7px; }
.form-note { margin: 12px 0 0; color: #7485a4; font-size: 11px; }

.site-footer { padding: 45px 0 60px; display: grid; grid-template-columns: auto 1fr auto; gap: 25px 45px; align-items: center; border-top: 1px solid var(--line); color: #7586a4; }
.site-footer .brand { color: #dce6f7; }
.site-footer p, .site-footer small { margin: 0; font-size: 12px; }
.site-footer nav { display: flex; gap: 25px; font-size: 12px; }
.site-footer small { grid-column: 2 / -1; }

.guide-dialog { width: min(620px, calc(100vw - 34px)); padding: 40px; color: var(--text); border: 1px solid rgba(99, 174, 255, .34); border-radius: 24px; background: #081329; box-shadow: 0 40px 120px rgba(0,0,0,.65); }
.guide-dialog::backdrop { background: rgba(0,3,11,.75); backdrop-filter: blur(8px); }
.guide-dialog h2 { margin-bottom: 20px; font-size: 32px; }
.guide-dialog .dialog-content { color: #9aaac6; line-height: 1.8; }
.guide-dialog .dialog-content ol { padding-left: 22px; }
.guide-dialog > a { display: inline-flex; margin-top: 15px; color: #70dfff; font-size: 13px; }
.dialog-close { position: absolute; right: 18px; top: 14px; color: #9bacc8; border: 0; background: none; font-size: 29px; cursor: pointer; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease, transform .75s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 960px) {
  :root { --shell: min(100% - 34px, 760px); }
  .site-header { height: 72px; padding-inline: 18px; }
  .menu-button { display: block; }
  .site-nav { position: absolute; left: 16px; right: 16px; top: 69px; padding: 20px; display: none; flex-direction: column; align-items: stretch; gap: 5px; border: 1px solid var(--line); border-radius: 18px; background: rgba(4,10,23,.96); box-shadow: 0 24px 70px rgba(0,0,0,.4); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 11px; }
  .site-nav .nav-cta { text-align: center; margin-top: 8px; }
  .hero { min-height: auto; padding-top: 70px; grid-template-columns: 1fr; gap: 65px; }
  .hero-copy { text-align: center; }
  .eyebrow, .response-note { justify-content: center; }
  .hero-intro, .search-box { margin-inline: auto; }
  .hero-visual { min-height: 590px; }
  .topic-grid { grid-template-columns: repeat(2,1fr); }
  .feature, .privacy { grid-template-columns: 1fr; gap: 60px; }
  .feature { padding-top: 10px; }
  .feature-image img { max-height: none; }
  .privacy-intro { position: static; }
  .showcase-grid { grid-template-columns: 1fr; }
  .showcase-copy { min-height: 420px; }
  .contact-panel { grid-template-columns: 1fr; padding: 45px; gap: 36px; }
}

@media (max-width: 620px) {
  :root { --shell: calc(100% - 28px); }
  .brand { font-size: 17px; }
  .brand-mark { width: 34px; height: 34px; }
  .hero { padding-top: 58px; gap: 42px; }
  h1 { font-size: 47px; }
  .hero-intro { font-size: 15px; line-height: 1.8; }
  .search-box { display: grid; grid-template-columns: 20px 1fr; padding: 10px 11px 10px 15px; }
  .search-box button { grid-column: 1 / -1; }
  .hero-visual { min-height: 510px; }
  .hero-image-frame { width: 88%; border-radius: 28px; transform: none; }
  .floating-chip { min-width: 106px; padding: 10px 12px; }
  .floating-chip-a { left: 0; top: 20%; }
  .floating-chip-b { right: 0; bottom: 12%; }
  .support-strip { grid-template-columns: repeat(2,1fr); }
  .support-strip div:nth-child(2) { border-right: 0; }
  .support-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .guides, .showcase { padding-block: 90px; }
  .section-heading { margin-bottom: 34px; }
  .section-heading h2, .feature h2, .privacy h2, .contact h2 { font-size: 39px; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { min-height: 260px; }
  .feature { padding-bottom: 90px; gap: 45px; }
  .feature-image img { border-radius: 20px; }
  .showcase-main { min-height: 540px; border-radius: 20px; }
  .showcase-copy { min-height: 360px; padding: 30px; border-radius: 20px; }
  .privacy { padding-block: 90px; }
  .contact { padding-bottom: 90px; }
  .contact-panel { padding: 30px 22px; border-radius: 23px; }
  .site-footer { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .site-footer nav { flex-wrap: wrap; justify-content: center; }
  .site-footer small { grid-column: auto; }
  .guide-dialog { padding: 34px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .reveal { opacity: 1; transform: none; }
}