:root{--winter-ink:#eaf4ff;--winter-muted:#a9bfd2;--winter-line:rgba(171,217,246,.22);--winter-panel:rgba(8,23,37,.78);--winter-panel-2:rgba(15,39,58,.76);--winter-ice:#a8e5ff;--winter-ice2:#72bde5;--winter-night:#07121d;--winter-glow:rgba(146,224,255,.14)}
body.winter-universe{background:radial-gradient(circle at 82% 6%,rgba(115,190,227,.14),transparent 28rem),linear-gradient(#06111b,#081521 52%,#061018);color:var(--winter-ink)}
.winter-universe a{color:#c8efff}.winter-universe a:hover{text-decoration-thickness:2px}.winter-universe :focus-visible{outline:3px solid #c9f1ff;outline-offset:3px}
.winter-connect{min-height:42px;display:flex;gap:14px;align-items:center;flex-wrap:wrap;padding:7px max(18px,calc((100vw - 1320px)/2));border-bottom:1px solid var(--winter-line);background:#05101a;color:var(--winter-muted);font-size:.83rem}.winter-connect a{color:#d9f4ff;text-decoration:none}.winter-brand{font-weight:800}.winter-connected{margin-left:auto}.winter-save{background:transparent;color:#d9f4ff;border:1px solid var(--winter-line);border-radius:999px;padding:6px 10px}
.winter-subnav{position:sticky;top:0;z-index:20;display:flex;gap:4px;overflow-x:auto;padding:9px max(18px,calc((100vw - 1320px)/2));background:rgba(4,14,23,.95);border-bottom:1px solid var(--winter-line);scrollbar-width:thin}.winter-subnav a{white-space:nowrap;padding:8px 11px;border-radius:999px;text-decoration:none;color:#cce8f5}.winter-subnav a[aria-current=page]{background:rgba(135,213,249,.16);box-shadow:inset 0 0 0 1px rgba(168,229,255,.3);color:white}
.winter-hero{padding:56px 0 36px;border-bottom:1px solid var(--winter-line);background:linear-gradient(180deg,rgba(17,43,63,.3),transparent)}.winter-hero.compact{padding:40px 0 28px}.winter-hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:38px;align-items:center}.winter-kicker{text-transform:uppercase;letter-spacing:.12em;font-size:.75rem;font-weight:800;color:#8fd4f5;margin:0 0 10px}.winter-hero h1{font-size:clamp(2.4rem,7vw,5.6rem);line-height:.95;margin:.1em 0 .25em;letter-spacing:-.045em}.winter-hero.compact h1{font-size:clamp(2.2rem,5vw,4.2rem)}.winter-deck{font-size:clamp(1.08rem,2vw,1.35rem);line-height:1.55;max-width:840px;color:#d5e9f4}.winter-actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}.winter-boundary{border-left:3px solid #7acff5;background:rgba(18,50,70,.6);padding:12px 14px;border-radius:0 10px 10px 0;color:#c7dce8}.winter-muted{color:var(--winter-muted)}
.winter-hero-orbit{min-height:300px;position:relative;border:1px solid var(--winter-line);border-radius:26px;background:radial-gradient(circle at 25% 35%,rgba(255,226,146,.18),transparent 22%),linear-gradient(155deg,rgba(28,67,94,.35),rgba(7,18,29,.25));overflow:hidden}.winter-sun{position:absolute;width:74px;height:74px;border-radius:50%;left:14%;top:20%;background:#ffe6a0;box-shadow:0 0 46px rgba(255,230,160,.3)}.winter-earth{position:absolute;width:116px;height:116px;border-radius:50%;right:18%;top:32%;background:linear-gradient(120deg,#5e97b2 0 44%,#d8edf5 45% 51%,#214357 52% 100%);transform:rotate(23deg);box-shadow:0 0 0 1px rgba(255,255,255,.16)}.winter-earth i{position:absolute;height:150%;width:2px;background:#dff7ff;left:50%;top:-25%;opacity:.65}.winter-surface{position:absolute;left:8%;right:8%;bottom:12%;height:40px;border-radius:55% 45% 0 0/80% 80% 0 0;background:linear-gradient(#e9f8ff,#8ecae5)}
.winter-section{padding:46px 0;border-bottom:1px solid var(--winter-line)}.winter-section-head{display:flex;justify-content:space-between;gap:22px;align-items:end;margin-bottom:22px}.winter-section h2{font-size:clamp(1.6rem,3vw,2.5rem);margin:.15em 0}.winter-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px}.winter-card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.winter-card{background:linear-gradient(145deg,var(--winter-panel),rgba(10,29,44,.56));border:1px solid var(--winter-line);border-radius:18px;padding:20px}.winter-card h3{margin:.2em 0 .55em}.winter-card p{color:#c6d8e4;line-height:1.6}.winter-card code{font-size:.9em}.winter-source-note,.winter-contract{background:rgba(13,37,54,.72);border:1px solid rgba(144,215,248,.28);border-radius:18px;padding:20px;line-height:1.65}.winter-source-note dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.winter-source-note dl div{padding:10px 0;border-bottom:1px solid var(--winter-line)}.winter-source-note dt{font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:#8ecdea}.winter-source-note dd{margin:5px 0 0}.winter-evidence{display:inline-block;font-size:.69rem;text-transform:uppercase;letter-spacing:.08em;border:1px solid rgba(125,210,248,.34);background:rgba(102,190,230,.09);padding:4px 7px;border-radius:999px;color:#b9eaff}.winter-mini-atlas{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px}.winter-mini-atlas a{display:flex;flex-direction:column;gap:5px;text-decoration:none;border:1px solid var(--winter-line);background:rgba(10,28,42,.7);border-radius:14px;padding:14px}.winter-mini-atlas span,.winter-mini-atlas small{color:#92bed3}.winter-feature{display:grid;grid-template-columns:1fr minmax(250px,.7fr);gap:18px;background:linear-gradient(125deg,rgba(17,50,70,.78),rgba(7,24,38,.72));border:1px solid var(--winter-line);border-radius:20px;padding:22px}.winter-constraint-preview{display:grid;grid-template-columns:1fr 1.2fr;gap:8px;align-content:center}.winter-constraint-preview span,.winter-constraint-preview strong{padding:9px;border-bottom:1px solid var(--winter-line)}
.winter-filterbar,.winter-compare-form{display:grid;grid-template-columns:2fr 1fr 1fr auto;gap:12px;align-items:end;margin-bottom:12px}.winter-filterbar label,.winter-compare-form label,.winter-tool label{display:grid;gap:6px;color:#bcd3df;font-size:.9rem}.winter-filterbar input,.winter-filterbar select,.winter-compare-form select,.winter-tool select{width:100%;background:#07141f;color:#edf9ff;border:1px solid #32556a;border-radius:10px;padding:11px}.winter-filter-status{color:#9bcce3}.winter-atlas-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:14px}.winter-record{scroll-margin-top:110px;background:var(--winter-panel);border:1px solid var(--winter-line);border-radius:18px;padding:19px}.winter-record[hidden]{display:none}.winter-record-meta{display:flex;flex-wrap:wrap;gap:7px;align-items:center;color:#9ec8dc;font-size:.76rem}.winter-record-meta span:not(.winter-evidence){border-left:1px solid var(--winter-line);padding-left:7px}.winter-record h2{font-size:1.35rem}.winter-record p{line-height:1.55;color:#cbdde7}.winter-record dl{display:grid;grid-template-columns:1fr 1fr;gap:8px}.winter-record dl div{background:rgba(255,255,255,.025);padding:9px;border-radius:9px}.winter-record dt{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:#86bad2}.winter-record dd{margin:3px 0 0}.winter-record details{margin-top:12px;border-top:1px solid var(--winter-line);padding-top:10px}.winter-record summary{cursor:pointer;font-weight:700}.winter-source-links{display:flex;gap:10px;flex-wrap:wrap}.winter-no-results{border:1px dashed #5a8094;border-radius:14px;padding:20px}
.winter-prose{max-width:850px;font-size:1.05rem;line-height:1.75}.winter-misconception{margin:20px 0;padding:16px 18px;border:1px solid rgba(253,211,131,.3);background:rgba(95,65,21,.22);border-radius:14px}.winter-process-chain{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.winter-process-chain article{position:relative;padding:20px;border:1px solid var(--winter-line);border-radius:16px;background:var(--winter-panel)}.winter-process-chain article span{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#173b50;color:#aee7ff}.winter-profile-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.winter-profile-grid article{border:1px solid var(--winter-line);border-radius:16px;padding:16px;background:var(--winter-panel)}.profile{height:140px;border-radius:11px;background:#081725;position:relative;overflow:hidden}.profile:before,.profile:after{content:"";position:absolute;left:10%;right:10%;border-radius:999px}.profile.all-cold:before{top:18%;height:64%;background:linear-gradient(#81cdef,#4d88aa)}.profile.refreeze:before{top:12%;height:34%;background:#65a9cb}.profile.refreeze:after{bottom:10%;height:34%;background:#79c1e1;box-shadow:0 -28px 0 #a85f4c}.profile.glaze:before{top:12%;height:34%;background:#6aacca}.profile.glaze:after{bottom:8%;height:15%;background:#7fc8e7;box-shadow:0 -38px 0 #a9604c}.lake-diagram{min-height:210px;position:relative;border-radius:16px;background:linear-gradient(#102a3e 0 52%,#184e68 53% 68%,#0d2332 69%);overflow:hidden}.lake-diagram span{position:absolute;left:8%;top:18%}.lake-diagram strong{position:absolute;left:38%;bottom:18%}.lake-diagram b{position:absolute;right:8%;top:24%}.lake-diagram i{position:absolute;width:56%;height:30px;left:20%;top:43%;border-top:3px solid #b8edff;border-radius:50%;transform:rotate(-6deg)}
.winter-table-wrap{overflow-x:auto;border:1px solid var(--winter-line);border-radius:14px}.winter-table-wrap table{width:100%;border-collapse:collapse;min-width:620px}.winter-table-wrap th,.winter-table-wrap td{text-align:left;padding:13px;border-bottom:1px solid var(--winter-line);vertical-align:top}.winter-table-wrap thead{background:rgba(79,142,174,.12)}.winter-table-wrap tbody th{color:#bce9ff}.winter-compare-output{margin-top:18px}.winter-compare-grid{display:grid;grid-template-columns:170px 1fr 1fr;border:1px solid var(--winter-line);border-radius:16px;overflow:hidden}.winter-compare-grid>*{padding:12px;border-right:1px solid var(--winter-line);border-bottom:1px solid var(--winter-line)}.winter-compare-grid .head{font-weight:800;background:rgba(58,118,150,.14)}
.winter-tool-layout{display:grid;grid-template-columns:minmax(280px,.85fr) minmax(300px,1.15fr);gap:20px}.winter-tool,.winter-tool-output{border:1px solid var(--winter-line);border-radius:18px;padding:20px;background:var(--winter-panel)}.winter-tool{display:grid;gap:14px}.winter-tool fieldset{border:1px solid var(--winter-line);border-radius:12px;padding:13px}.winter-tool fieldset label{display:flex;grid-template-columns:none;align-items:flex-start;gap:9px;margin:9px 0}.winter-tool-output h2{margin-top:0}.winter-output-list{display:grid;gap:10px}.winter-output-list article{border-left:3px solid #7dcff3;background:rgba(75,135,163,.09);padding:10px 12px}.winter-assumptions{margin-top:18px;border-top:1px solid var(--winter-line);padding-top:12px;font-size:.92rem;color:#b6cad6}
.winter-rep-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.winter-rep-grid figure{margin:0;border:1px solid var(--winter-line);border-radius:18px;overflow:hidden;background:var(--winter-panel)}.winter-rep-grid figcaption{display:grid;gap:7px;padding:14px;color:#c4d8e3}.rep-panel{height:220px;position:relative;overflow:hidden;background:#0a1a27}.rep-photo{background:linear-gradient(170deg,#0a1a29,#1b3342 58%,#d6edf6 59% 62%,#6e91a2 63%)}.rep-photo:after{content:"";position:absolute;inset:0;background-image:radial-gradient(circle,#eaf9ff 0 1px,transparent 1.7px);background-size:26px 24px;transform:skewX(-10deg)}.rep-profile{background:linear-gradient(90deg,#0b1720 0 50%,#0f2634 50%)}.rep-profile:before{content:"cold → warm → cold";position:absolute;left:10%;right:10%;top:18%;height:64%;display:grid;place-items:center;background:linear-gradient(#76bcd9 0 33%,#ac624c 34% 66%,#74c5e4 67%);border-radius:12px;color:#07121d;font-weight:800}.rep-albedo{background:linear-gradient(90deg,#eaf8ff 0 50%,#31444f 50%)}.rep-albedo:after{content:"more reflected light   ↔   less reflected light";position:absolute;inset:0;display:grid;place-items:center;color:#07121d;font-weight:800;text-shadow:0 0 12px white}.rep-calendar{background:conic-gradient(from -90deg,#b7e9ff 0 25%,#17384b 25% 50%,#b7e9ff 50% 75%,#17384b 75%)}.rep-calendar:after{content:"N winter  •  S winter";position:absolute;inset:18%;border-radius:50%;display:grid;place-items:center;background:#07121d;color:#dff8ff;text-align:center}.rep-crystal:before{content:"❄";position:absolute;inset:0;display:grid;place-items:center;font-size:7rem;color:#dff8ff}.rep-crystal:after{content:"icon ≠ complete morphology";position:absolute;left:10%;right:10%;bottom:10%;text-align:center;color:#9dc9dd}.rep-fieldnote{background:repeating-linear-gradient(#0d2231,#0d2231 31px,#294455 32px)}.rep-fieldnote:after{content:"snow cover  ✓\A falling particles  ?\A surface ice  observed\A process  unknown";white-space:pre;position:absolute;inset:22px;color:#cdebf8;line-height:2;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.winter-source-list{display:grid;gap:12px}.winter-source-list article{display:grid;grid-template-columns:1.2fr 1fr auto;gap:16px;align-items:center;border:1px solid var(--winter-line);border-radius:14px;padding:15px;background:var(--winter-panel)}.winter-source-list h3{margin:7px 0 2px;font-size:1.05rem}.winter-source-list p{margin:.2em 0;color:#bfd3df}.winter-source-list a{white-space:nowrap}
@media(max-width:900px){.winter-hero-grid,.winter-feature,.winter-tool-layout{grid-template-columns:1fr}.winter-card-grid.three,.winter-process-chain,.winter-profile-grid{grid-template-columns:1fr}.winter-filterbar,.winter-compare-form{grid-template-columns:1fr 1fr}.winter-filterbar button{align-self:end}.winter-source-list article{grid-template-columns:1fr}.winter-connected{margin-left:0}.winter-hero-orbit{min-height:240px}.winter-compare-grid{grid-template-columns:120px 1fr 1fr;font-size:.9rem}}
@media(max-width:580px){.winter-filterbar,.winter-compare-form{grid-template-columns:1fr}.winter-record dl{grid-template-columns:1fr}.winter-section{padding:34px 0}.winter-hero{padding-top:34px}.winter-connect{gap:9px}.winter-connect .winter-connected{width:100%}.winter-compare-grid{grid-template-columns:92px 1fr 1fr;font-size:.82rem}.winter-compare-grid>*{padding:8px}}
@media(prefers-reduced-motion:reduce){.winter-universe *, .winter-universe *:before,.winter-universe *:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}