:root{--ink:#071a2b;--cyan:#44d9e6;--lime:#b6f23a;--paper:#f3f6f8;--muted:#718096;--line:#dce4ea}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Pretendard","Noto Sans KR",Arial,sans-serif}
.auth-shell{min-height:100vh;display:grid;grid-template-columns:minmax(500px,1.34fr) minmax(380px,.66fr)}
.brand-side{position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:center;padding:clamp(48px,8vw,110px);color:#fff;background:radial-gradient(circle at 80% 15%,rgba(68,217,230,.28),transparent 28%),linear-gradient(145deg,#071a2b 0%,#0c3550 58%,#0a5261 100%)}
.brand-side:after{content:"";position:absolute;right:-100px;bottom:-150px;width:430px;height:430px;border:1px solid rgba(255,255,255,.15);border-radius:50%;box-shadow:0 0 0 55px rgba(255,255,255,.03),0 0 0 110px rgba(255,255,255,.025)}
.brand-mark{position:absolute;top:42px;left:clamp(48px,8vw,110px);display:grid;place-items:center;width:48px;height:48px;border:1px solid var(--cyan);border-radius:12px;color:var(--cyan);font-size:.75rem;font-weight:900;letter-spacing:.08em}
.overline{position:relative;z-index:1;margin:0 0 18px;color:var(--cyan);font-size:.74rem;font-weight:850;letter-spacing:.2em}
.brand-side h1{position:relative;z-index:1;margin:0;font-size:clamp(3.3rem,6.8vw,7rem);line-height:.82;letter-spacing:-.07em}
.brand-copy{position:relative;z-index:1;max-width:610px;margin:30px 0;color:#c8dbe5;font-size:1.08rem;line-height:1.7}
.pipeline{position:relative;z-index:1;display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:28px}
.pipeline span{border:1px solid rgba(255,255,255,.2);border-radius:99px;padding:8px 12px;font-size:.72rem;letter-spacing:.08em}
.pipeline b{color:var(--lime);margin-right:5px}.pipeline i{color:var(--cyan);font-style:normal}
.tech-line{position:relative;z-index:1;margin-top:38px;color:#8fb0c1;font:11px/1.5 Consolas,monospace;letter-spacing:.08em}
.login-side{display:grid;place-items:center;padding:40px;background:linear-gradient(135deg,#f8fafb,#e8eef2)}
.login-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:22px;padding:42px;box-shadow:0 24px 65px rgba(7,26,43,.12)}
.overline.dark{color:#168a9a}.login-card h2{margin:0;font-size:2.35rem;letter-spacing:-.04em}.intro{margin:9px 0 28px;color:var(--muted);line-height:1.6}
form label{display:block;margin:18px 0 7px;color:#536575;font-size:.71rem;font-weight:850;letter-spacing:.14em}
form input{width:100%;height:50px;border:1px solid #cbd5df;border-radius:9px;padding:0 14px;font:inherit;color:var(--ink)}
form input:focus{outline:3px solid rgba(68,217,230,.2);border-color:#168a9a}.password-field{position:relative}.password-field input{padding-right:70px}
.password-field button{position:absolute;right:7px;top:7px;height:36px;border:0;background:#edf6f7;color:#147584;border-radius:7px;padding:0 12px;font-size:.68rem;font-weight:850;cursor:pointer}
.sign-in{display:flex;justify-content:space-between;width:100%;margin-top:25px;border:0;border-radius:9px;padding:15px 17px;background:var(--ink);color:#fff;font-weight:850;letter-spacing:.12em;cursor:pointer}.sign-in:hover{background:#0d405a}.sign-in span{color:var(--lime)}
.auth-message{margin:18px 0 -3px;padding:11px 13px;border-radius:8px;font-size:.84rem;line-height:1.5}.auth-message.error{background:#fff0f0;color:#b42318}.auth-message.success{background:#e8f8ee;color:#087443}
.security-note{text-align:center;margin:20px 0 0;color:#8a9aa8;font-size:.72rem}
@media(max-width:1024px){.auth-shell{grid-template-columns:1fr}.brand-side{min-height:390px;padding:95px 32px 42px}.brand-mark{left:32px;top:30px}.brand-side h1{font-size:clamp(3.1rem,13vw,5rem)}.login-side{padding:28px 18px}.login-card{padding:30px}.pipeline{margin-top:12px}}
@media(max-width:520px){.brand-side{min-height:340px}.brand-side h1{font-size:3rem}.brand-copy{font-size:.95rem;margin:20px 0}.pipeline i{display:none}.tech-line{display:none}.login-card h2{font-size:2rem}}