/* A restrained glass layer for navigation and controls; boards remain solid. */
:root{--glass-bg:rgba(255,255,255,.72);--glass-rim:rgba(255,255,255,.96);--glass-edge:rgba(112,150,179,.20);--glass-shadow:0 12px 36px rgba(37,77,107,.08),inset 0 1px 0 rgba(255,255,255,.98);--glass-sheen:linear-gradient(135deg,rgba(255,255,255,.72),rgba(255,255,255,.06) 48%,rgba(223,241,255,.23));--card-glass:rgba(255,255,255,.78);--glass-blue:rgba(219,240,254,.76)}
:root[data-theme=dark]{--glass-bg:rgba(24,39,55,.76);--glass-rim:rgba(207,234,255,.18);--glass-edge:rgba(139,183,216,.16);--glass-shadow:0 14px 45px rgba(0,0,0,.23),inset 0 1px 0 rgba(216,238,255,.13);--glass-sheen:linear-gradient(135deg,rgba(201,228,255,.10),rgba(145,194,229,.01) 48%,rgba(108,174,214,.05));--card-glass:rgba(28,43,58,.78);--glass-blue:rgba(34,72,100,.76)}
body{background-color:var(--bg);background-image:radial-gradient(ellipse 70% 620px at 95% 0,rgba(126,205,243,.16),transparent 75%),radial-gradient(ellipse 50% 550px at 0 300px,rgba(166,219,211,.10),transparent 76%);background-repeat:no-repeat;background-attachment:fixed}
[data-theme=dark] body{background-image:radial-gradient(ellipse 70% 620px at 95% 0,rgba(43,122,172,.16),transparent 75%),radial-gradient(ellipse 50% 550px at 0 300px,rgba(44,110,111,.09),transparent 76%)}
.site-header{top:12px;background:none;border:0;backdrop-filter:none;-webkit-backdrop-filter:none;pointer-events:none}
.header-inner{pointer-events:auto;border:1px solid var(--glass-edge);border-top-color:var(--glass-rim);border-radius:26px;padding-inline:22px;background-image:var(--glass-sheen);background-color:var(--glass-bg);backdrop-filter:blur(26px) saturate(155%);-webkit-backdrop-filter:blur(26px) saturate(155%);box-shadow:var(--glass-shadow)}
.primary-nav a[aria-current=page]:after{bottom:10px;left:8px;right:8px;height:2px;opacity:.75}
.theme-toggle{background:var(--glass-sheen),var(--glass-bg);border-color:var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:inset 0 1px 0 var(--glass-rim),0 3px 9px rgba(20,60,90,.04)}
.button{border-radius:100px;background:linear-gradient(180deg,rgba(255,255,255,.14),rgba(255,255,255,0) 70%),var(--blue);border:1px solid rgba(255,255,255,.2);box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 5px 16px rgba(16,113,170,.13);transition:transform .2s,box-shadow .2s,background-color .2s}
.button:hover{background:linear-gradient(180deg,rgba(255,255,255,.18),rgba(255,255,255,0) 70%),var(--blue-hover);box-shadow:inset 0 1px 0 rgba(255,255,255,.32),0 7px 20px rgba(16,113,170,.18);transform:translateY(-1px)}
.header-cta{border-radius:100px}.language a[aria-current]{text-shadow:0 0 18px rgba(136,200,239,.12)}
.hero-chat{border-radius:30px;background:var(--glass-bg);border-color:var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:0 25px 65px rgba(34,77,108,.13),inset 0 1px 0 var(--glass-rim);padding:7px}
[data-theme=dark] .hero-chat{box-shadow:0 25px 65px rgba(0,0,0,.28),inset 0 1px 0 var(--glass-rim)}
.chat-top{background:transparent;padding:12px 14px 17px}.chat-wall{border-radius:22px;background:linear-gradient(145deg,rgba(206,233,246,.55),rgba(220,238,232,.40)),var(--wall)}
[data-theme=dark] .chat-wall{background:linear-gradient(145deg,rgba(36,68,92,.35),rgba(24,51,61,.20)),var(--wall)}
.chat-wall:before{opacity:.04}[data-theme=dark] .chat-wall:before{opacity:.025}.chat-incoming{box-shadow:0 3px 12px rgba(31,62,81,.04);border:1px solid var(--glass-edge)}.chat-outgoing{border:1px solid rgba(135,188,140,.16);box-shadow:0 3px 12px rgba(31,62,81,.03)}
.message-buttons{gap:7px;margin-top:8px}.message-buttons>span{border-radius:10px;background:var(--glass-bg);border:1px solid var(--glass-edge);box-shadow:inset 0 1px 0 var(--glass-rim)}
.game-card{background:var(--glass-sheen),var(--card-glass);border-color:var(--glass-edge);border-top-color:var(--glass-rim);border-radius:22px;box-shadow:0 4px 18px rgba(27,63,89,.025),inset 0 1px 0 var(--glass-rim)}
.game-card:hover{border-color:var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:0 10px 28px rgba(27,83,123,.09),inset 0 1px 0 var(--glass-rim);transform:translateY(-2px)}
.game-card h3 a:after{border-radius:22px}.game-card:focus-within{border-color:var(--blue)}
.game-avatar,.chat-avatar{background:var(--glass-sheen),var(--glass-blue);border:1px solid var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:inset 0 1px 0 var(--glass-rim)}
.filters{padding:4px;border:1px solid var(--glass-edge);background:var(--glass-bg);border-radius:100px;box-shadow:inset 0 1px 0 var(--glass-rim)}
.filters button{border-radius:100px;padding:8px 14px}.filters button.active{background:var(--glass-sheen),var(--glass-blue);box-shadow:inset 0 1px 0 var(--glass-rim),0 2px 8px rgba(30,72,103,.06)}
.search{background:var(--glass-bg);border-color:var(--glass-edge);border-top-color:var(--glass-rim);border-radius:100px;box-shadow:inset 0 1px 0 var(--glass-rim)}
.journal-art,.real-photo{border-radius:20px}.journal-art.has-photo{border:1px solid var(--glass-edge);box-shadow:0 7px 24px rgba(20,55,83,.07)}
.has-photo .journal-number,.has-photo .journal-type{border-radius:100px;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:rgba(18,40,57,.68);border:1px solid rgba(255,255,255,.21);box-shadow:inset 0 1px 0 rgba(255,255,255,.15);padding:5px 10px}
.final-cta{border-radius:30px;background:var(--glass-sheen),var(--glass-blue);border:1px solid var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:inset 0 1px 0 var(--glass-rim),0 12px 35px rgba(27,83,123,.035)}
.how{background:var(--glass-blue);border-top:1px solid var(--glass-edge);border-bottom:1px solid var(--glass-edge)}
.demo,.tips{border-radius:22px;background:var(--glass-sheen),var(--card-glass);border-color:var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:inset 0 1px 0 var(--glass-rim),0 7px 22px rgba(22,55,80,.025)}
.article-callout{border-radius:22px;background:var(--glass-sheen),var(--glass-blue);border-color:var(--glass-edge);box-shadow:inset 0 1px 0 var(--glass-rim)}
.play-reset,.play-tools button,.number-bank button,.code-palette button{background:var(--glass-sheen),var(--glass-bg);border-color:var(--glass-edge);border-top-color:var(--glass-rim);box-shadow:inset 0 1px 0 var(--glass-rim);border-radius:12px}
.play-tools button.selected,.number-bank button.selected{background:var(--glass-sheen),var(--glass-blue);border-color:var(--blue)}
/* Solid fallbacks preserve legibility where blur or transparency is unavailable. */
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.header-inner{background:var(--surface)}.has-photo .journal-number,.has-photo .journal-type{background:#18344ae8}}
@media(max-width:1050px){.header-inner{padding-inline:16px;gap:22px}.filters button{padding-inline:11px}}
@media(max-width:760px){.header-inner{padding-inline:13px;gap:15px}.filters button{padding-inline:9px}}
@media(max-width:600px){html{scroll-padding-top:140px}.site-header{top:8px}.header-inner.wrap{width:calc(100% - 16px);padding-inline:12px;border-radius:23px;column-gap:8px}.header-inner{height:108px}.primary-nav a[aria-current=page]:after{bottom:1px;left:4px;right:4px}.hero{padding-top:36px}.hero-chat{border-radius:27px;padding:6px}.chat-top{padding:10px 11px 15px}.chat-wall{border-radius:20px}.game-card{border-radius:20px}.game-card h3 a:after{border-radius:20px}.filters{padding:3px;border-radius:16px;justify-content:space-between}.filters button{font-size:10px;padding-inline:9px;min-height:42px}.search{border-radius:14px}.final-cta{border-radius:25px}.demo,.article-callout,.tips{border-radius:19px}.journal-art,.real-photo{border-radius:17px}}
@media(max-width:360px){.header-inner{grid-template-columns:1fr 142px}.filters button{font-size:9px;padding-inline:7px}.filters button span{margin-left:3px}.header-inner .brand{font-size:22px}}
@media(prefers-reduced-transparency:reduce){.header-inner,.theme-toggle,.filters,.search,.game-card,.demo,.tips{background:var(--surface);backdrop-filter:none;-webkit-backdrop-filter:none}.hero-chat{background:var(--surface)}.chat-wall:before{display:none}}
@media(prefers-reduced-motion:reduce){.button,.game-card,.journal-photo{transition:none}.button:hover,.game-card:hover{transform:none}}
@media(max-width:600px){.header-inner{row-gap:0;height:110px}}