:root{--blue:#1d56cf;--blue-light:#f0f5fe;--text:#1e1e1e;--secondary:#757575;--line:#d9d9d9;--font:"Noto Sans JP","Yu Gothic",Meiryo,sans-serif;font-family:var(--font);color:var(--text);font-synthesis:none;background:#f4f5f7}
*{box-sizing:border-box}body{margin:0}button,textarea{font:inherit;color:inherit}button{border:0;background:none;cursor:pointer;padding:0}button:hover{filter:brightness(.97)}button:focus-visible,textarea:focus-visible{outline:2px solid var(--blue);outline-offset:3px}img{display:block}p,h1,h2,h3{margin:0}button:disabled{cursor:default}button[hidden],[hidden]{display:none!important}
.app{position:relative;max-width:780px;height:100dvh;min-height:400px;margin:auto;background:#fff;display:flex;flex-direction:column;overflow:hidden}
.header{height:64px;flex:none;display:flex;align-items:center;justify-content:space-between;padding:0 16px;position:relative}.icon-button{height:44px;width:44px;flex:none;display:flex;align-items:center;justify-content:center;border-radius:50%}.header .icon-button{background:#f4f5f7}.tabs{display:flex;width:190px;height:42px;padding:4px;border-radius:21px;background:var(--blue-light)}.tabs button{flex:1;border-radius:17px;font-size:14px;font-weight:500}.tabs button[aria-current=page]{background:#fff;color:var(--blue)}.header-spacer{width:44px;height:44px}
.content{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-width:none;padding:20px;outline:none}.content::-webkit-scrollbar{display:none}.welcome{padding-top:104px;display:flex;flex-direction:column;align-items:center;gap:16px}.welcome h1{font-size:26px;line-height:43px;font-weight:700;text-align:center;letter-spacing:0}.welcome .subtitle{font-size:13px;line-height:21px;color:var(--secondary);text-align:center}.suggestions{width:100%;display:grid;gap:16px;margin-top:40px}.suggestions button{border:1px solid var(--line);border-radius:12px;min-height:48px;padding:10px;font-size:14px;font-weight:500;line-height:22px}.suggestions button:hover{background:var(--blue-light);border-color:#b7caf4}
.composer-area{flex:none;padding:16px 16px max(28px,env(safe-area-inset-bottom));background:#fff}.composer{display:grid;grid-template-columns:44px minmax(0,1fr) 44px 44px;align-items:center;min-height:56px;border:.5px solid rgba(29,86,207,.18);border-radius:28px;padding:5.5px 6px;background:var(--blue-light)}.composer textarea{grid-column:2;grid-row:1;width:100%;height:28px;min-height:28px;max-height:120px;resize:none;background:transparent;border:0;outline:none!important;box-shadow:none;padding:2px;line-height:24px;font-size:15px;scrollbar-width:thin}.composer textarea::placeholder{color:#6b6b6b;opacity:1}.composer .add{grid-column:1;grid-row:1}.composer .mic{grid-column:3;grid-row:1}.composer .send{grid-column:4;grid-row:1}.send span{height:36px;width:36px;display:flex;align-items:center;justify-content:center;background:var(--blue);border-radius:50%}.composer.expanded{padding:12px 10px 8px;border-radius:26px;grid-template-columns:44px minmax(0,1fr) 44px 44px;row-gap:6px;min-height:104px}.composer.expanded textarea{grid-column:1/-1;grid-row:1;padding:2px 6px;height:28px}.composer.expanded .icon-button{grid-row:2}
.conversation{display:flex;flex-direction:column;gap:16px}.turn{display:flex;flex-direction:column;gap:16px}.turn+.turn{margin-top:12px}.user-question{align-self:flex-end;width:min(306px,100%);padding:14px;border-radius:16px;background:#f5f5f5;font-size:16px;line-height:26px;white-space:pre-line;overflow-wrap:anywhere}.answer-heading{font-size:18px;line-height:30px;font-weight:700;white-space:pre-line}.answer-text,.answer-list{font-size:16px;line-height:26px;overflow-wrap:anywhere}.answer-list{list-style-position:inside;margin:0;padding:0}.citation{display:inline-flex;vertical-align:middle;min-height:44px;align-items:center;justify-content:center;margin-left:6px;white-space:nowrap}.citation span{font-size:10px;font-weight:500;line-height:18px;padding:2px 8px;border:.5px solid var(--blue);border-radius:20px;color:var(--blue)}.reference-article{display:flex;align-items:center;gap:8px;background:var(--blue-light);color:var(--blue);padding:10px;border-radius:8px;min-height:44px;text-align:left}.reference-article span{flex:1;font-size:12px;font-weight:500;line-height:20px}
.news-list{display:flex;flex-direction:column;gap:22px}.news-heading h1{font-size:22px;font-weight:700;line-height:36px}.news-heading p{font-size:12px;line-height:20px;color:var(--secondary)}.news-card{display:flex;flex-direction:column;gap:12px;text-align:left;width:100%;border-bottom:1px solid var(--line);padding-bottom:0}.news-card .photo{width:100%;height:auto;aspect-ratio:350/197;object-fit:cover;border-radius:14px}.publisher{display:flex;align-items:center;gap:6px;font-size:12px;line-height:20px;color:#6e7582;font-weight:500}.news-card h2{font-size:20px;line-height:31px;font-weight:700}.news-card time{font-size:11px;line-height:18px;color:#6e7582;display:block;padding-bottom:12px}.compact .news-card-top{display:flex;align-items:flex-start;gap:12px}.compact .news-card-info{min-width:0;flex:1;display:flex;flex-direction:column;gap:8px}.compact h2{font-size:17px;line-height:27px}.compact .photo{width:88px;height:88px;flex:none;border-radius:10px}
.article{display:flex;flex-direction:column;gap:16px}.back-link{color:var(--blue);font-size:14px;line-height:22px;min-height:48px;text-align:left;padding:12px}.article h1{font-size:23px;line-height:38px;font-weight:700}.article .meta{font-size:12px;line-height:20px;color:var(--secondary)}.article-photo{width:100%;aspect-ratio:350/197;object-fit:cover;border-radius:12px}.article h2{font-size:16px;line-height:23px;font-weight:500}.axes{border:1px solid #e0e5ed;padding:16px;border-radius:12px;display:flex;flex-direction:column;gap:20px}.axis-label{display:flex;justify-content:space-between;align-items:center;font-size:14px;font-weight:500;line-height:22px}.axis-label span:last-child{color:var(--blue);font-size:12px}.axis-bar{display:flex;gap:6px;margin-top:8px}.axis-bar span{flex:1;height:6px;background:#e5ebf2;border-radius:3px}.axis-bar .filled{background:var(--blue)}.article hr{width:100%;margin:0;border:0;border-top:1px solid var(--line)}.article .body-title{font-size:14px;color:var(--secondary)}.article-body{font-size:16px;line-height:26px}.article-body p+p{margin-top:26px}.explanation{background:var(--blue-light);padding:16px;border-radius:12px;display:flex;flex-direction:column;gap:10px}.explanation h2{font-size:14px;line-height:23px;color:var(--blue);font-weight:700}.explanation p{font-size:16px;line-height:26px}
.overlay{position:absolute;inset:0;z-index:10;background:rgba(0,0,0,.22)}.scrim{position:absolute;inset:0;width:100%;height:100%;cursor:default}.sidebar{position:absolute;inset:0 auto 0 0;width:min(320px,calc(100% - 40px));background:#fff;padding:44px 16px max(24px,env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:16px}.sidebar-heading{display:flex;align-items:center;justify-content:space-between;height:48px;flex:none}.brand{display:flex;gap:8px;align-items:center;font-size:17px;font-weight:700;white-space:nowrap}.sidebar-nav{display:grid;gap:8px;flex:none}.sidebar-nav button{display:flex;align-items:center;gap:12px;padding:0 12px;height:48px;text-align:left;font-size:15px;font-weight:500;border-radius:8px}.sidebar-nav button:first-child{font-size:16px}.sidebar-nav button:hover,.history button:hover{background:#f4f5f7}.history{min-height:0;overflow:auto}.history h2{font-size:12px;line-height:20px;font-weight:500;color:#6e7582;margin-bottom:8px}.history button{display:block;width:100%;padding:4px 12px;border-radius:8px;text-align:left;font-size:14px;line-height:23px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history button[aria-current=page]{background:var(--blue-light)}.sidebar-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:auto;flex:none}.new-chat-pill{width:148px;height:48px;border-radius:24px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;gap:10px;font-size:16px;font-weight:500}.avatar{width:48px;height:48px;background:#f0f5fc;border:1px solid #d4def0;border-radius:50%;display:grid;place-items:center}.account-popover{position:absolute;bottom:90px;left:16px;width:calc(100% - 32px);border:1px solid #dee3eb;border-radius:12px;background:#fff;box-shadow:0 4px 20px #1727480a;padding:7px 0}.account-popover button{height:48px;padding:0 12px;display:flex;align-items:center;gap:12px;font-size:15px;width:100%;text-align:left}
.source-sheet{position:absolute;bottom:0;width:100%;background:#fff;border-radius:20px 20px 0 0;padding:20px;display:flex;flex-direction:column;gap:12px;max-height:85%;overflow:auto;min-height:356px}.sheet-handle{width:34px;height:4px;background:var(--line);border-radius:2px;align-self:center;flex:none}.sheet-heading{display:flex;align-items:center;justify-content:space-between;height:44px;flex:none}.sheet-heading h2{font-size:14px;font-weight:500}.source-file{font-size:16px;line-height:26px;font-weight:500;overflow-wrap:anywhere}.source-label{font-size:12px;line-height:19px;color:var(--secondary)}.source-chunk{font-size:14px;line-height:23px;background:#f5f5f5;border-radius:8px;padding:12px 14px;margin:0}.source-type{font-size:11px;line-height:18px;color:var(--secondary)}.toast{position:absolute;bottom:164px;left:20px;right:20px;background:#243349;color:#fff;font-size:13px;line-height:21px;border-radius:10px;padding:12px 16px;z-index:30;box-shadow:0 4px 20px #0002}
@media(min-width:800px){.app{border-left:1px solid #e7ebf2;border-right:1px solid #e7ebf2}.content{padding-left:40px;padding-right:40px}.composer-area{padding-left:40px;padding-right:40px}.welcome{max-width:500px;margin:auto}.news-list,.article,.conversation{max-width:660px;margin:auto}.news-card .photo{max-height:340px}.sidebar{box-shadow:8px 0 32px #00000008}}@media(max-width:360px){.header{padding:0 12px}.content{padding:16px}.tabs{width:176px}.welcome{padding-top:64px}.welcome h1{font-size:23px;line-height:39px}.welcome .subtitle{font-size:12px}.suggestions{margin-top:24px}.composer-area{padding-left:12px;padding-right:12px}.composer textarea{font-size:14px}}@media(max-height:750px){.welcome{padding-top:40px}.suggestions{margin-top:16px}.sidebar{padding-top:24px}}

/* Interaction states: short, interruptible feedback; no sticky hover on touch. */
html,body{height:100%;overflow:hidden;overscroll-behavior:none}
.app{height:var(--viewport-height,100dvh);min-height:0;top:var(--viewport-top,0px)}
button{-webkit-tap-highlight-color:transparent;touch-action:manipulation;transition:background-color 120ms ease,color 120ms ease,transform 120ms ease,opacity 120ms ease;user-select:none}
button:hover{filter:none}
button img{pointer-events:none}
.suggestions button:hover{background:none;border-color:var(--line)}
.sidebar-nav button:hover,.history button:hover{background:none}
.history button[aria-current=page]:hover{background:var(--blue-light)}
button:active:not(:disabled){background-color:#e8effb}
.icon-button:active:not(:disabled),.avatar:active{transform:scale(.94)}
.new-chat-pill:active{background-color:#1645ae!important;transform:scale(.98)}
.send:active:not(:disabled){background:transparent;transform:scale(.92)}
.send:disabled{opacity:.4}
.citation:active{background:transparent!important}
.citation:active span{background:#dfE9FC}
.news-card:active{background:transparent!important;opacity:.72}
.scrim:active{background:rgba(0,0,0,.22)!important}
.overlay{background:transparent}
.scrim{background:rgba(0,0,0,.22);transition:none;touch-action:none}
.sidebar,.source-sheet{overscroll-behavior:contain}
.source-sheet{padding-bottom:max(20px,env(safe-area-inset-bottom))}
.composer{overflow:hidden;transition:border-color 160ms ease,box-shadow 160ms ease}
.composer:focus-within{border-color:#9bb7ed;box-shadow:0 0 0 2px #1d56cf0a}
.composer textarea{font-size:16px}
.history button{min-height:44px;padding-top:10.5px;padding-bottom:10.5px}
.content{overflow-anchor:none}
.answer-figure{margin:0;display:flex;flex-direction:column;gap:8px}
.answer-figure figcaption{font-size:13px;font-weight:500;line-height:21px}
.figure-image{display:block;width:100%;border-radius:8px;overflow:hidden;cursor:zoom-in}
.figure-image img{width:100%;height:auto;aspect-ratio:3/2;object-fit:contain}
.figure-image:active{opacity:.85;background:transparent!important}
.figure-viewer{position:absolute;inset:0;display:flex;flex-direction:column;background:#fff}
.figure-viewer-header{height:64px;flex:none;padding:10px 16px;display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:500}
.figure-viewer-body{flex:1;min-height:0;padding:20px;display:flex;flex-direction:column;gap:16px}
.figure-viewer h2{font-size:18px;line-height:30px}
.figure-canvas{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;overflow:auto;overscroll-behavior:contain}
.figure-canvas img{width:100%;height:auto;max-height:100%;object-fit:contain}
/* A transparent edge gradually introduces glass and a white veil. The form
   stays opaque enough to read; empty margins still pass touches to the page. */
.composer-area{position:absolute;inset:auto 0 0;z-index:2;background:transparent;isolation:isolate;pointer-events:none}
.composer-area::before,.composer-area::after{content:"";position:absolute;inset:-24px 0 0;z-index:-1;pointer-events:none}
.composer-area::before{background:linear-gradient(to bottom,rgba(255,255,255,0),rgba(255,255,255,.18) 24%,rgba(255,255,255,.65) 62%,rgba(255,255,255,.94))}
.composer-area::after{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);-webkit-mask-image:linear-gradient(to bottom,transparent,rgba(0,0,0,.15) 22%,rgba(0,0,0,.65) 58%,#000);mask-image:linear-gradient(to bottom,transparent,rgba(0,0,0,.15) 22%,rgba(0,0,0,.65) 58%,#000)}
.composer{pointer-events:auto}
.content{padding-bottom:calc(var(--composer-height,100px) + 24px);scroll-padding-bottom:calc(var(--composer-height,100px) + 24px)}
@media(hover:hover) and (pointer:fine){
  .icon-button:hover,.sidebar-nav button:hover,.history button:hover,.avatar:hover{background:#edf2fa}
  .suggestions button:hover{background:var(--blue-light);border-color:#b7caf4}
  .news-card:hover h2{color:var(--blue)}
  .citation:hover span{background:var(--blue-light)}
  .new-chat-pill:hover{background:#164bbd}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}button:active{transform:none!important}}