.ai1982{max-width:1180px;height:calc(100vh - 112px);min-height:620px;margin:34px auto;display:grid;grid-template-columns:250px 1fr;background:#fff;border:1px solid var(--line);border-radius:28px;overflow:hidden;box-shadow:var(--shadow)}
.ai1982-side{padding:28px 20px;background:linear-gradient(165deg,#111936,#1b2855 58%,#3a2184);color:#fff}.ai1982-logo{width:54px;height:54px;display:grid;place-items:center;border-radius:17px;background:linear-gradient(135deg,#22ced5,#5a52ff 65%,#d53fff);font-weight:950;font-size:20px;box-shadow:0 12px 35px rgba(72,89,255,.42)}.ai1982-side h1{font-size:26px;margin:16px 0 30px;color:#fff}.ai1982-new{width:100%;justify-content:flex-start;background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.17)}
.ai1982-main{min-width:0;display:grid;grid-template-rows:1fr auto auto;background:linear-gradient(180deg,#fbfcff,#f5f7fc)}.ai1982-messages{overflow:auto;padding:38px clamp(20px,7vw,85px)}.ai1982-welcome{text-align:center;max-width:580px;margin:15vh auto 0}.ai1982-welcome>span{display:grid;place-items:center;width:68px;height:68px;margin:auto;border-radius:22px;background:linear-gradient(135deg,#20c9d2,#2864ff,#7728ff);color:#fff;font-size:30px;box-shadow:0 18px 45px rgba(66,72,240,.28)}.ai1982-welcome h2{font-size:38px;margin:20px 0 8px}.ai1982-welcome p{color:var(--muted)}
.ai1982-message{display:flex;gap:13px;max-width:800px;margin:0 auto 22px;align-items:flex-start}.ai1982-message.user{flex-direction:row-reverse}.ai1982-avatar{flex:0 0 38px;height:38px;border-radius:12px;display:grid;place-items:center;background:#19213a;color:#fff;font-size:10px;font-weight:900}.ai1982-message.assistant .ai1982-avatar{background:linear-gradient(135deg,#20c9d2,#6251ff)}.ai1982-message.error .ai1982-avatar{background:#b42338}.ai1982-bubble{max-width:min(680px,82%);background:#fff;border:1px solid var(--line);border-radius:7px 19px 19px 19px;padding:15px 18px;box-shadow:0 7px 25px rgba(25,37,78,.06)}.ai1982-message.user .ai1982-bubble{background:#2864ff;color:#fff;border-color:#2864ff;border-radius:19px 7px 19px 19px}.ai1982-message.error .ai1982-bubble{color:#a0192d}.ai1982-text{white-space:pre-wrap;overflow-wrap:anywhere}.ai1982-message.thinking .ai1982-text{animation:aiThink 1.2s ease-in-out infinite}.ai1982-sources{display:grid;gap:7px;border-top:1px solid var(--line);margin-top:14px;padding-top:12px}.ai1982-sources b{font-size:12px}.ai1982-sources a{font-size:13px;color:var(--blue);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ai1982-sources a:hover{text-decoration:underline}
.ai1982-form{margin:0 clamp(20px,7vw,85px);padding:9px;display:flex;align-items:flex-end;gap:8px;border:1px solid var(--line);border-radius:21px;background:#fff;box-shadow:0 15px 45px rgba(29,40,82,.12)}.ai1982-form textarea{resize:none;max-height:180px;border:0!important;box-shadow:none!important;padding:10px 12px;background:transparent}.ai1982-form button{flex:0 0 43px;height:43px;border:0;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;font-size:22px;cursor:pointer}.ai1982-form button:disabled{opacity:.45;cursor:not-allowed}.ai1982-notice{text-align:center;padding:9px 15px 17px}
body.dark .ai1982{background:#11192b;border-color:#303c55}body.dark .ai1982-main{background:linear-gradient(180deg,#101728,#0c1322)}body.dark .ai1982-welcome h2,body.dark .ai1982-welcome p{color:#eff4ff}body.dark .ai1982-message .ai1982-bubble{background:#172137;color:#edf3ff;border-color:#33415f}body.dark .ai1982-message.user .ai1982-bubble{background:#315fda;border-color:#315fda}body.dark .ai1982-form{background:#141e32;border-color:#3a4762}body.dark .ai1982-sources{border-color:#3a4762}
@keyframes aiThink{50%{opacity:.45}}@media(max-width:820px){.ai1982{margin:0;height:calc(100vh - 70px);min-height:560px;border:0;border-radius:0;grid-template-columns:1fr}.ai1982-side{display:flex;align-items:center;gap:12px;padding:10px 16px}.ai1982-logo{width:40px;height:40px;border-radius:12px;font-size:14px}.ai1982-side h1{margin:0;font-size:19px}.ai1982-new{width:auto;margin-left:auto;font-size:0;padding:10px}.ai1982-new:first-letter{font-size:20px}.ai1982-messages{padding:25px 15px}.ai1982-form{margin:0 14px}.ai1982-welcome{margin-top:10vh}.ai1982-bubble{max-width:85%}}
@media(prefers-reduced-motion:reduce){.ai1982-message.thinking .ai1982-text{animation:none}}

/* v4.7: vùng hội thoại luôn cuộn độc lập, kể cả trên màn hình nhỏ. */
.ai1982-main{min-height:0!important;height:100%;overflow:hidden;grid-template-rows:minmax(0,1fr) auto auto!important}
.ai1982-messages{min-width:0;min-height:0;height:100%;overflow-y:auto!important;overflow-x:hidden;overscroll-behavior:contain;scrollbar-gutter:stable}
@media(max-width:820px){.ai1982{height:calc(100dvh - 70px)!important;min-height:0!important;grid-template-rows:auto minmax(0,1fr)}.ai1982-messages{padding-bottom:110px}}