:root{--bg:#0b0d12;--panel:#11141c;--panel-light:#1a1f2a;--text:#ececf1;--muted:#a7acbb;--line:#2c3343;--accent:#22c55e;--violet:#818cf8}*{box-sizing:border-box;padding:0;margin:0}body,html{width:100%;height:100%}.landing-body{min-height:100vh;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Noto Sans KR,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.landing-body:before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(900px 600px at 90% 10%,rgba(34,197,94,.14),transparent 60%),radial-gradient(700px 520px at 8% 30%,rgba(129,140,248,.12),transparent 65%),radial-gradient(900px 620px at 50% 110%,hsla(0,0%,100%,.03),transparent 60%),linear-gradient(180deg,hsla(0,0%,100%,.02),transparent 28%,hsla(0,0%,100%,.01))}.chatgpt-shell{min-height:100vh;display:grid;grid-template-columns:260px 1fr}.chatgpt-sidebar{background:linear-gradient(180deg,rgba(17,20,28,.98),rgba(15,18,26,.98));border-right:1px solid hsla(0,0%,100%,.08);padding:14px;display:flex;flex-direction:column;gap:12px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.chatgpt-brand{font-size:14px;font-weight:700;letter-spacing:.03em}.chatgpt-newchat{display:block;text-decoration:none;color:var(--text);border:1px solid hsla(0,0%,100%,.12);border-radius:8px;padding:10px 12px;background:transparent;width:100%;text-align:left;cursor:pointer}.chatgpt-newchat:hover{background:hsla(0,0%,100%,.06);border-color:rgba(34,197,94,.4)}.chatgpt-history{display:flex;flex-direction:column;gap:8px}.chatgpt-history button{text-align:left;border:0;color:#c0c6d7;background:transparent;padding:8px 10px;border-radius:8px;cursor:pointer}.chatgpt-history button:hover{background:hsla(0,0%,100%,.04);color:var(--text)}.chatgpt-history button.is-active{background:rgba(34,197,94,.18);color:var(--text);border:1px solid rgba(34,197,94,.35)}.chatgpt-sidefoot{margin-top:auto;font-size:12px;color:var(--muted)}.chatgpt-main{background:linear-gradient(180deg,rgba(26,31,42,.98),rgba(22,27,37,.98));display:grid;grid-template-rows:auto 1fr auto;min-height:100vh}.chatgpt-topbar{border-bottom:1px solid hsla(0,0%,100%,.08);padding:16px 20px;display:flex;align-items:baseline;justify-content:space-between}.chatgpt-topbar h1{font-size:18px}.vtag{display:inline-block;margin-left:8px;font-size:11px;padding:2px 7px;border-radius:999px;background:rgba(16,163,127,.2);color:#8ef2d7;border:1px solid rgba(16,163,127,.35);vertical-align:middle}.chatgpt-topbar span{color:var(--muted);font-size:12px}.chatgpt-thread{width:min(900px,100%);margin:0 auto;padding:20px 16px 28px;display:flex;flex-direction:column;gap:14px}.msg{border:1px solid hsla(0,0%,100%,.11);border-radius:14px;padding:14px 16px;line-height:1.6;box-shadow:0 8px 28px rgba(0,0,0,.24)}.msg-assistant{background:rgba(34,197,94,.1)}.msg-user{background:rgba(129,140,248,.14)}.msg-system{background:rgba(245,158,11,.14);border-color:rgba(245,158,11,.35)}.typing{color:var(--muted);font-style:italic}.chatgpt-inputbar{width:min(900px,100%);margin:0 auto 18px;padding:0 16px;display:flex;gap:10px}.chatgpt-inputbar input{flex:1 1;background:rgba(16,20,30,.78);color:var(--text);border:1px solid hsla(0,0%,100%,.18);border-radius:12px;padding:13px 14px;outline:none}.chatgpt-inputbar input:focus{border-color:rgba(34,197,94,.55);box-shadow:0 0 0 3px rgba(34,197,94,.15)}.chatgpt-inputbar button{border:0;border-radius:10px;padding:0 18px;background:linear-gradient(180deg,#2ddf8e,#22c55e);color:#04231c;font-weight:700;cursor:pointer;box-shadow:0 8px 22px rgba(34,197,94,.35)}.chatgpt-hint{width:min(900px,100%);margin:0 auto 16px;padding:0 16px;font-size:12px;color:var(--muted);opacity:.9}@media (max-width:920px){.chatgpt-shell{grid-template-columns:1fr}.chatgpt-sidebar{display:none}}