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/* Ultramarine terminal theme */
:root{--ink:#0A1128;--panel:#0038A8;--panel-2:rgba(0,56,168,.22);--line:rgba(77,150,255,.42);--blue:#4D96FF;--ultra:#0038A8;--aqua:#00FFCC;--dusk:#FFB347;--text:#F3F7FF;--muted:#B8C9E8}
body{background-color:var(--ink);background-image:radial-gradient(ellipse at 50% 0,rgba(0,56,168,.18),transparent 58%);font-family:"Microsoft YaHei",system-ui,sans-serif}
body:before{background-image:linear-gradient(rgba(77,150,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(77,150,255,.05) 1px,transparent 1px);background-size:24px 24px;opacity:.45}
body:after{content:"";position:fixed;inset:0;z-index:30;pointer-events:none;opacity:.045;background:repeating-linear-gradient(0deg,transparent 0 3px,rgba(77,150,255,.5) 4px)}
.site-header{background:#0A1128;border-bottom:1px solid var(--blue);backdrop-filter:none}
.site-header:before{content:"夜间观测 // 群青信号稳定";display:block;padding:3px max(20px,calc((100% - var(--max))/2));border-bottom:1px solid rgba(77,150,255,.25);color:var(--aqua);font:700 10px/1.4 monospace;letter-spacing:.12em}
.nav{height:66px}
.brand{letter-spacing:.04em}
.brand-mark{width:34px;height:34px;display:block;object-fit:cover;border:1px solid var(--aqua);border-radius:0;transform:none;box-shadow:0 0 14px rgba(0,255,204,.55);image-rendering:auto}
.nav-links{font-family:monospace;letter-spacing:.03em}
.nav-links a{padding:8px 0;border-bottom:1px solid transparent}
.nav-links a:hover{border-color:var(--aqua)}
.menu-button{border-radius:0;border-color:var(--blue);font-family:monospace}
.hero{min-height:720px;border-bottom:1px solid var(--blue);background:#0A1128}
.hero:before{z-index:-1;background:linear-gradient(90deg,rgba(10,17,40,.94) 0%,rgba(10,17,40,.72) 42%,rgba(10,17,40,.18) 100%)}
.hero-art{transform:scale(1.035) translate(var(--parallax-x,0px),var(--parallax-y,0px));transition:transform .18s ease-out;object-position:62% center;image-rendering:auto}
.hero:after{width:min(46vw,560px);height:min(46vw,560px);right:4%;top:16%;border:1px solid rgba(0,255,204,.54);border-radius:50%;background:repeating-conic-gradient(from 0deg,rgba(77,150,255,.12) 0deg 1deg,transparent 1deg 15deg);box-shadow:inset 0 0 0 18px rgba(10,17,40,.2),inset 0 0 0 19px rgba(255,179,71,.28),0 0 50px rgba(0,56,168,.5);animation:float 12s ease-in-out infinite}
.hero .shell{position:relative;padding-top:64px;padding-bottom:44px}
.hero .shell:before{content:"TERMINAL 01 / COASTAL ARCHIVE";position:absolute;top:18px;left:0;padding:5px 10px;border:1px solid rgba(77,150,255,.55);color:var(--aqua);background:rgba(10,17,40,.72);font:700 11px/1.4 monospace;letter-spacing:.12em}
.eyebrow{letter-spacing:.14em;font-family:monospace}
.hero h1{letter-spacing:.06em}
.download-btn,.button{border-radius:0;background:var(--aqua);color:#0A1128;border:1px solid var(--aqua);box-shadow:4px 4px 0 rgba(0,56,168,.75);clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px))}
.download-btn:hover,.button:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(0,56,168,.8)}
.button.ghost{background:rgba(0,56,168,.12);border:1px solid var(--blue);color:var(--text);box-shadow:none}
.hero-meta span{border-radius:0;border-color:rgba(77,150,255,.55);background:rgba(10,17,40,.78);font-family:monospace}
.section{padding:74px 0;position:relative}
.section.alt{background:rgba(0,56,168,.08);border-block:1px solid rgba(77,150,255,.35)}
.section-head{border-bottom:1px solid rgba(77,150,255,.35);padding-bottom:16px;margin-bottom:26px}
.section h2,.page-hero h1{letter-spacing:.03em}
.card{background:rgba(0,56,168,.14);border:1px solid rgba(77,150,255,.42);border-radius:0;box-shadow:inset 0 0 0 1px rgba(10,17,40,.75)}
.card:before{width:48px;border-color:var(--aqua)}
.card:after{pointer-events:none}
.card h3{color:var(--text)}
.image-card:after{background:linear-gradient(transparent,rgba(10,17,40,.94))}
.timeline{border-left:1px dashed var(--blue)}
.timeline article:before{border-radius:0;transform:rotate(45deg);background:var(--dusk);box-shadow:0 0 12px rgba(255,179,71,.6)}
.faq details{background:rgba(0,56,168,.12);border:1px solid rgba(77,150,255,.38);border-radius:0}
.faq summary{color:var(--text)}
.archive-link{background:rgba(0,56,168,.12);border:1px solid rgba(77,150,255,.42);border-radius:0;position:relative}
.archive-link:before{content:"";position:absolute;left:0;top:0;width:14px;border-top:2px solid var(--aqua)}
.archive-link:hover{border-color:var(--aqua);background:rgba(0,56,168,.26)}
.page-hero{background:linear-gradient(180deg,rgba(0,56,168,.32),rgba(10,17,40,.96));border-bottom:1px solid var(--blue);position:relative}
.page-hero:after{content:"";position:absolute;right:0;bottom:0;width:100%;height:1px;background:var(--dusk);opacity:.55}
.breadcrumbs{font-family:monospace}
.callout{border-left:3px solid var(--dusk);background:rgba(255,179,71,.07);border-radius:0}
.fact-grid,.fact{border-color:rgba(77,150,255,.4)}
.fact b{color:var(--aqua)}
.site-footer{background:#0A1128;border-top:1px solid var(--blue)}
.friend-links a{border-radius:0;border-color:rgba(77,150,255,.42)}
.toast{border-radius:0;background:#F3F7FF;color:#0A1128;border-left-color:var(--aqua)}
@media(max-width:980px){.nav-links{top:82px}.home-main{display:block;padding:0}.home-main>.section{margin:0;border-left:0;border-right:0}.home-main>#guide,.home-main>#features,.home-main>#updates,.home-main>.section:has(.faq){grid-column:auto}.home-main>#updates .shell.grid-2{grid-template-columns:1fr}.site-header:before{padding-left:14px}.nav{height:62px}.hero{min-height:640px}.hero:before{background:linear-gradient(180deg,rgba(10,17,40,.52),rgba(10,17,40,.96))}.hero:after{width:82vw;height:82vw;right:-24vw;top:10%}.hero-art{object-position:64% center}.hero .shell{padding-top:76px}.section{padding:54px 0}.grid-2,.grid-3,.footer-grid{grid-template-columns:1fr}}
@media(max-width:430px){.site-header:before{font-size:9px}.hero{min-height:600px}.hero h1{font-size:2.55rem}.hero-meta{grid-template-columns:1fr 1fr}.nav-links{background:#0A1128;border-bottom:1px solid var(--blue)}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}.hero-art{transform:none}}

.home-main{max-width:1600px;margin:0 auto;padding:12px;display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:12px}
.home-main>.hero{grid-column:1/-1}
.home-main>.section{margin:0;min-width:0;border:1px solid rgba(77,150,255,.38);background-color:rgba(0,56,168,.055);padding:38px 28px}
.home-main>#intro,.home-main>#content,.home-main>.section:has(.archive-list){grid-column:1/-1}
.home-main>#guide,.home-main>#features{grid-column:span 6}
.home-main>#updates{grid-column:span 7}
.home-main>.section:has(.faq){grid-column:span 5}
.home-main .shell{width:100%;max-width:none}
.home-main .section-head{align-items:center}
.home-main>.section.alt{background-color:rgba(0,56,168,.09)}
.home-main>#guide .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.home-main>#features .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.home-main>#updates .shell.grid-2{grid-template-columns:minmax(0,1.2fr) minmax(220px,.8fr)}
.home-main>.section:has(.faq) .section-head{align-items:center}
@media(max-width:980px){.home-main{display:block;padding:0}.home-main>.section{margin:0;border-left:0;border-right:0}.home-main>#guide,.home-main>#features,.home-main>#updates,.home-main>.section:has(.faq){grid-column:auto}.home-main>#updates .shell.grid-2{grid-template-columns:1fr}}
@media(max-width:680px){.home-main{padding:0}.home-main>.section{padding:48px 18px}.home-main>#guide .grid-3,.home-main>#features .grid-2{grid-template-columns:1fr}}

/* Managed download confirmation; the static href remains available without JavaScript. */
.download-guard-overlay{position:fixed;z-index:10020;inset:0;display:grid;place-items:center;padding:20px;background:rgba(4,7,16,.84);backdrop-filter:blur(7px)}
.download-guard-overlay[hidden]{display:none!important}.download-guard-dialog{width:min(460px,100%);padding:28px;border:1px solid var(--yellow,#ffde4d);border-radius:4px;background:#080c24;color:#f4f7ff;box-shadow:0 26px 80px rgba(0,0,0,.68),0 0 0 4px rgba(255,222,77,.08)}
.download-guard-kicker{display:block;margin-bottom:12px;color:var(--yellow,#ffde4d);font-size:12px;font-weight:800}.download-guard-dialog h2{margin:0 0 12px;color:#fff;font-size:1.55rem;line-height:1.25}.download-guard-dialog p{margin:0;color:#e2e8f0;line-height:1.7}.download-guard-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}.download-guard-actions button{min-height:44px;padding:0 18px;border:1px solid #9aa8c7;border-radius:3px;background:#111936;color:#fff;cursor:pointer;font:inherit;font-weight:750}.download-guard-actions .download-guard-confirm{border-color:var(--yellow,#ffde4d);background:var(--yellow,#ffde4d);color:#111522}.download-guard-actions button:focus-visible{outline:2px solid #fff;outline-offset:3px}
.home-main>.seo-news-section{grid-column:1/-1;min-width:0;padding:30px 34px 34px;background:linear-gradient(110deg,rgba(0,56,168,.17),rgba(0,255,204,.035) 58%,rgba(0,56,168,.08));border:1px solid rgba(77,150,255,.46);border-top:2px solid var(--aqua)}
.seo-news-section .section-head{display:grid;grid-template-columns:minmax(220px,.7fr) minmax(280px,1.3fr);align-items:end;gap:28px;margin-bottom:0;padding-bottom:20px;border-bottom:1px solid rgba(77,150,255,.32)}
.seo-news-section .section-head>div{min-width:0}.seo-news-section .section-head .eyebrow{display:block;margin-bottom:8px;font-size:.72rem;letter-spacing:.16em}.seo-news-section h2{font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.25;letter-spacing:.02em}.seo-news-section .section-head>p{max-width:560px;justify-self:end;margin:0;color:var(--muted);font-size:.94rem;line-height:1.7;text-align:right}
.seo-news-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:14px;padding-top:20px}.seo-news-grid:empty{display:none}.seo-news-grid>.card{min-width:0;min-height:156px;padding:20px 22px 18px;background:rgba(0,12,42,.48);border:1px solid rgba(77,150,255,.34);box-shadow:none}.seo-news-grid>.card:before{width:32px}.seo-news-grid>.card h3{overflow-wrap:anywhere;font-size:1.04rem;line-height:1.5}.seo-news-grid>.card time{display:block;margin:0 0 9px;color:var(--dusk);font:700 .76rem/1.4 monospace}.seo-news-grid>.card p{margin:0 0 14px;color:var(--muted);font-size:.9rem;line-height:1.65}.seo-news-grid>.card>a{display:inline-flex;align-items:center;gap:8px;color:var(--aqua);font-size:.84rem;font-weight:800}.seo-news-grid>.card>a:after{content:'→';transition:transform .18s ease}.seo-news-grid>.card>a:hover:after{transform:translateX(3px)}
.home-main>.seo-news-section{padding:28px 30px 30px}
.seo-news-section .section-head{grid-template-columns:minmax(0,1fr) minmax(250px,1.2fr);gap:18px}
@media(max-width:680px){.home-main>.seo-news-section{padding:32px 18px}.seo-news-section .section-head{grid-template-columns:1fr;gap:12px;align-items:start}.seo-news-section .section-head>p{justify-self:start;text-align:left}.seo-news-grid{grid-template-columns:1fr}}