:root{--bg:#031426;--panel:#0a2942;--line:#2c5572;--text:#f7fbff;--muted:#b4c8d6;--blue:#1a7bb5;--field:#dce8f8}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Arial,"Noto Sans TC",sans-serif;background:radial-gradient(circle at 70% 25%,#153f5d 0,#071d32 42%,#020d18 100%);color:var(--text)}body{min-height:100vh;display:flex;flex-direction:column}.login-header{position:sticky;top:0;z-index:30;height:88px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;background:rgba(2,14,27,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.logo img{height:48px}.header-right{display:flex;align-items:center;gap:24px}.header-right>a{color:var(--text);font-weight:800;text-decoration:none}.header-right nav{display:flex;border:1px solid var(--line);border-radius:24px;padding:3px}.header-right nav a{padding:9px 14px;border-radius:20px;color:var(--muted);text-decoration:none;font-weight:800}.header-right nav a.active{background:#fff;color:#092139}.login-shell{width:min(1280px,100%);margin:auto;display:grid;grid-template-columns:1fr 540px;gap:72px;align-items:start;padding:64px 38px}.intro span{color:#71c9ff;font-weight:900;letter-spacing:.16em}.intro h1{font-size:clamp(60px,8vw,110px);line-height:.95;margin:18px 0 28px}.intro p{font-size:23px;line-height:1.7;color:var(--muted);max-width:620px}.secure{margin-top:34px;color:#8fe0b7;font-weight:800}.card{background:rgba(248,251,255,.98);color:#0a2238;padding:42px;border-radius:26px;box-shadow:0 28px 80px rgba(0,0,0,.4)}.card h2{font-size:30px;margin:0 0 28px}.card label{display:block;font-weight:800;margin:18px 0}.card input{display:block;width:100%;margin-top:10px;padding:16px;border:1px solid #b6c9df;border-radius:12px;background:var(--field);font-size:18px}.forgot{display:block;text-align:right;color:#126fa5;text-decoration:none;margin:-4px 0 24px}.card button{width:100%;padding:17px;border:0;border-radius:13px;background:var(--blue);color:#fff;font-size:18px;font-weight:900;cursor:pointer}.alert{padding:13px;border-radius:10px;margin-bottom:18px}.alert.error{background:#ffe5e5;color:#8b1c1c}.alert.success{background:#e5f7ec;color:#246c3c}footer{text-align:center;color:#7f9aae;padding:20px}@media(max-width:900px){.login-shell{grid-template-columns:1fr;gap:32px}.intro h1{font-size:64px}.header-right>a{display:none}}@media(max-width:560px){.login-header{height:72px;padding:0 14px}.logo img{height:36px}.login-shell{padding:34px 18px}.card{padding:28px 20px}.intro h1{font-size:52px}}