@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Source+Han+Sans+SC:wght@400;500;600;700;800&display=swap');

:root {
  --ink: #e7f3ff;
  --ink-deep: #071126;
  --teal: #43d7c2;
  --teal-dark: #1ea28f;
  --champagne: #b9d7ff;
  --paper: #0b1630;
  --surface: #101f3e;
  --surface-soft: #13294a;
  --muted: #9cafc8;
  --line: #253a61;
  --shadow: 0 18px 50px rgba(0, 0, 0, .28);
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: Inter, 'Source Han Sans SC', system-ui, sans-serif; color: var(--ink); background: radial-gradient(circle at 10% -10%, #17335e 0, transparent 35%), var(--paper); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(7,17,38,.86); backdrop-filter: blur(16px); border-bottom: 1px solid rgba(67,215,194,.18); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand img { width: 150px; height: auto; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; color: #9cafc8; }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; transition: .2s ease; }
.nav-links a:hover, .nav-links a[aria-current='page'] { color: var(--teal); border-color: var(--teal); }
.menu-toggle { display:none; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; width: 44px; height: 44px; font-size: 20px; }
.hero { position: relative; overflow: hidden; background: linear-gradient(135deg,#071126 0%,#0e2346 56%,#0b3a49 100%); color: white; min-height: 560px; display: grid; align-items: center; border-bottom: 1px solid rgba(67,215,194,.22); }
.hero:before, .hero:after { content: ''; position: absolute; inset: 0; pointer-events:none; }
.hero:before { background: radial-gradient(circle at 78% 30%, rgba(67,215,194,.22), transparent 34%), radial-gradient(circle at 12% 70%, rgba(185,215,255,.12), transparent 30%); }
.hero:after { opacity: .3; background-image: linear-gradient(120deg, transparent 0 47%, rgba(185,215,255,.3) 48% 48.5%, transparent 49%), linear-gradient(35deg, transparent 0 55%, rgba(67,215,194,.35) 56% 56.5%, transparent 57%); background-size: 260px 180px, 220px 180px; }
.hero-grid { position: relative; z-index: 1; display:grid; grid-template-columns: minmax(0,1.1fr) minmax(360px,.9fr); gap: 60px; align-items:center; padding: 72px 0; }
.eyebrow { display:inline-flex; align-items:center; gap:8px; color: var(--champagne); letter-spacing:.15em; text-transform: uppercase; font-size: 12px; font-weight:700; }
.eyebrow:before { content:''; width:32px; height:1px; background:var(--champagne); }
h1,h2,h3 { margin: 0 0 16px; line-height:1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(38px, 5vw, 72px); max-width: 680px; }
h2 { font-size: clamp(26px, 3vw, 40px); }
h3 { font-size: 19px; }
.hero-copy { color: rgba(255,255,255,.78); font-size: 17px; max-width: 600px; margin: 0 0 30px; }
.hero-actions { display:flex; flex-wrap:wrap; gap:12px; }
.btn { display:inline-flex; align-items:center; justify-content:center; gap:8px; min-height:46px; padding: 0 18px; border-radius: 8px; border: 1px solid transparent; font-weight:700; font-size:14px; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--teal); color: #06172a; }
.btn-primary:hover { background: var(--teal-dark); }
.btn-ghost { border-color: rgba(255,255,255,.25); color: white; }
.btn-ghost:hover { border-color: var(--champagne); color: var(--champagne); }
.hero-visual { position: relative; min-height: 340px; }
.staircase { position:absolute; width: 350px; height: 260px; right: 18px; top: 32px; transform: skewY(-18deg) rotate(-9deg); }
.staircase span { position:absolute; width: 210px; height: 36px; border:1px solid rgba(212,180,131,.7); background: linear-gradient(90deg, rgba(31,154,138,.1), rgba(212,180,131,.26)); box-shadow: 0 0 24px rgba(31,154,138,.15); }
.staircase span:nth-child(1){right:0;bottom:0}.staircase span:nth-child(2){right:22px;bottom:46px}.staircase span:nth-child(3){right:44px;bottom:92px}.staircase span:nth-child(4){right:66px;bottom:138px}.staircase span:nth-child(5){right:88px;bottom:184px}.staircase span:nth-child(6){right:110px;bottom:230px}
.visual-tag { position:absolute; bottom:4px; left: 12px; background: rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.16); padding: 14px 16px; border-radius: 8px; width: 210px; }
.visual-tag strong { display:block; font-size: 28px; color: var(--champagne); }
.visual-tag span { color: rgba(255,255,255,.68); font-size:12px; }
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
.section-head { display:flex; justify-content:space-between; gap:24px; align-items:flex-end; margin-bottom:30px; }
.section-head p { max-width: 530px; margin:0; color: var(--muted); }
.kicker { color: var(--teal-dark); font-size: 12px; font-weight:800; letter-spacing:.12em; text-transform:uppercase; }
.grid-3 { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:18px; }
.grid-4 { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px; }
.card { background: linear-gradient(145deg, rgba(16,31,62,.98), rgba(14,37,68,.98)); border:1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 0 8px 26px rgba(0,0,0,.14); }
.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); transition:.25s ease; }
.card p { margin:0; color:var(--muted); font-size:14px; }
.card .meta { color: var(--teal-dark); font-size:12px; font-weight:700; margin-bottom: 10px; }
.feature-band { background: #08142d; color:white; border-top: 1px solid rgba(67,215,194,.12); border-bottom: 1px solid rgba(67,215,194,.12); }
.feature-band .card { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.14); }
.feature-band .card p { color: rgba(255,255,255,.68); }
.feature-band .card h3 { color: white; }
.split { display:grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items:center; }
.list-clean { list-style:none; margin:0; padding:0; display:grid; gap:12px; }
.list-clean li { display:flex; gap:12px; align-items:flex-start; color:var(--muted); }
.list-clean li:before { content:'+'; color:var(--teal); font-weight:800; }
.stat-row { display:grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--line); border:1px solid var(--line); border-radius:8px; overflow:hidden; }
.stat { background:var(--surface); padding:20px; }.stat strong{display:block;font-size:30px;color:var(--teal)}.stat span{font-size:12px;color:var(--muted)}
.article-grid { display:grid; grid-template-columns: 1.1fr .9fr; gap: 30px; }
.article-card { display:grid; grid-template-columns: 100px 1fr; gap: 18px; align-items:start; }
.article-num { font-size:40px; font-weight:800; color: var(--teal); line-height:1; }
.article-card h3 { margin-bottom:8px; font-size:17px; }
.article-card p { font-size:13px; }
.faq-list { display:grid; gap:10px; }.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:0 18px}.faq-item summary{cursor:pointer;list-style:none;font-weight:700;padding:18px 0;position:relative;padding-right:28px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:'+';position:absolute;right:0;color:var(--teal);font-size:22px;top:14px}.faq-item[open] summary:after{content:'−'}.faq-item p{color:var(--muted);font-size:14px;padding:0 0 18px;margin:0}
.page-hero { background: linear-gradient(120deg,#071126,#102750); color: white; padding: 68px 0 58px; border-bottom:1px solid rgba(67,215,194,.2); }.page-hero p { color: rgba(255,255,255,.7); max-width: 700px; margin:0; }
.breadcrumb { display:flex; gap:8px; flex-wrap:wrap; align-items:center; color:var(--muted); font-size:13px; margin: 24px 0; }.breadcrumb a:hover{color:var(--teal)}
.article-layout { display:grid; grid-template-columns:minmax(0,1fr) 280px; gap:42px; align-items:start; }
.prose { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding: clamp(24px,4vw,52px); }.prose .article-meta{color:var(--muted);font-size:13px;margin-bottom:30px}.prose h2{font-size:28px;margin-top:36px}.prose h3{font-size:19px;margin-top:28px}.prose p,.prose li{color:#b3c4db}.prose ul{padding-left:20px}.prose blockquote{margin:24px 0;padding:18px 20px;border-left:3px solid var(--teal);background:var(--surface-soft);color:var(--ink);font-weight:600}.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px}.tag{padding:6px 10px;background:var(--surface-soft);color:var(--teal);border-radius:999px;font-size:12px;font-weight:700}.side-card{position:sticky;top:100px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}.side-card h3{font-size:16px}.side-card ul{margin:0;padding-left:18px;color:var(--muted);font-size:13px;display:grid;gap:7px}.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}.article-nav a{background:var(--surface);border:1px solid var(--line);padding:16px;border-radius:8px}.article-nav small{display:block;color:var(--muted);font-size:11px;margin-bottom:5px}.article-nav strong{font-size:14px}
.site-footer{background:#050d1d;color:white;padding:58px 0 24px;margin-top:70px;border-top:1px solid rgba(67,215,194,.16)}.footer-grid{display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:30px}.site-footer p,.site-footer a{color:rgba(255,255,255,.6);font-size:13px}.site-footer h3{font-size:14px;color:white}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;display:flex;justify-content:space-between;gap:20px;color:rgba(255,255,255,.45);font-size:12px}
.notice { border-left: 3px solid var(--teal); background: #102746; padding: 16px 18px; color: #b9d7ff; border-radius: 0 8px 8px 0; }
.search-box{display:flex;gap:10px;margin-top:18px}.search-box input{flex:1;min-height:46px;border:1px solid var(--line);border-radius:8px;padding:0 14px;font:inherit;background:#0b1730;color:var(--ink)}.search-box button{border:0;background:var(--teal);color:#06172a;padding:0 18px;border-radius:8px;font-weight:700}
@media (max-width: 900px){.nav-links{gap:13px;font-size:13px}.hero-grid{grid-template-columns:1fr;gap:20px}.hero-visual{min-height:270px}.staircase{right:8%;transform:scale(.82) skewY(-18deg) rotate(-9deg)}.grid-4{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:1fr}.side-card{position:static}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width: 640px){.container{width:min(100% - 28px,1160px)}.nav-wrap{min-height:68px}.brand img{width:132px}.menu-toggle{display:block}.nav-links{display:none;position:absolute;left:14px;right:14px;top:68px;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.nav-links.open{display:flex}.nav-links a{padding:10px 8px}.hero{min-height:620px}.hero-grid{padding:56px 0}.hero-copy{font-size:16px}.hero-visual{min-height:230px}.staircase{right:-18px;top:28px;transform:scale(.68) skewY(-18deg) rotate(-9deg)}.visual-tag{left:0;bottom:0}.section{padding:64px 0}.section-head{display:block}.section-head p{margin-top:12px}.grid-3,.grid-4,.split,.stat-row,.article-grid,.article-nav{grid-template-columns:1fr}.card{padding:20px}.footer-grid{grid-template-columns:1fr}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:8px}}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}