:root{color-scheme:dark;--bg:#10151d;--panel:#18212d;--line:#293749;--text:#eef4fb;--muted:#9eacbc;--accent:#6ee7c7}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"Noto Sans JP",system-ui,sans-serif;min-height:100vh}aside{position:fixed;inset:0 auto 0 0;width:280px;background:#121a24;border-right:1px solid var(--line);padding:28px 20px;display:flex;flex-direction:column}.brand{font-weight:800;font-size:21px;letter-spacing:.02em;margin:0 10px 30px}nav{display:grid;gap:6px}nav a{color:#bdc9d6;text-decoration:none;padding:12px 14px;border-radius:9px}nav a:hover{background:#202d3c;color:white}aside form{margin-top:auto}button{border:0;border-radius:9px;background:var(--accent);color:#09241d;font-weight:750;padding:12px 16px;cursor:pointer;width:100%}.shell{margin-left:280px;padding:64px;max-width:1180px}.eyebrow{font-size:12px;letter-spacing:.16em;color:var(--accent);font-weight:800}h1{font-size:38px;margin:8px 0}.muted{color:var(--muted)}.panel{margin-top:40px;padding:30px;background:var(--panel);border:1px solid var(--line);border-radius:16px}.placeholder{min-height:260px;display:grid;place-content:center;text-align:center;color:var(--muted)}.placeholder span{color:var(--accent);font-size:12px;letter-spacing:.18em}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(420px,100%);background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:36px}.login-card form{display:grid;gap:18px;margin-top:28px}label{display:grid;gap:8px;color:#cbd5df;font-size:14px}input{background:#0e151d;border:1px solid #354558;border-radius:9px;color:white;padding:13px;font:inherit}.error{background:#3a1f29;color:#ffbdcb;padding:11px;border-radius:8px;font-size:14px}@media(max-width:760px){aside{position:static;width:auto}aside form{margin-top:20px}.shell{margin:0;padding:32px 22px}}