:root{--bg:#eef1f6;--surface:#ffffff;--surface2:#f4f6f9;--border:#dfe3ea;--accent:#3b7aed;--accent2:#6366f1;--text:#1a1d26;--text-sub:#5c6577;--error:#dc3545;--success:#0d9f6e;--warning:#b45309}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans",Meiryo,"Yu Gothic",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center}
.bg-grid{position:fixed;z-index:0;inset:0;background-image:linear-gradient(rgba(59,122,237,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(59,122,237,.06) 1px,transparent 1px);background-size:40px 40px;pointer-events:none}
.card{position:relative;z-index:1;width:100%;max-width:420px;margin:24px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:40px 36px;box-shadow:0 4px 24px rgba(15,23,42,.06)}
.logo-area{text-align:center;margin-bottom:28px}
.logo-badge{display:inline-flex;align-items:center;gap:8px;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:10px 16px;margin-bottom:12px}
.logo-icon{width:28px;height:28px;background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:14px}
.logo-text{font-family:Menlo,Consolas,monospace;font-size:13px;font-weight:500}
.logo-sub{display:block;font-size:11px;color:var(--text-sub);font-family:Menlo,Consolas,monospace;text-transform:uppercase;letter-spacing:.08em}
.card-title{font-size:20px;font-weight:700;margin-bottom:4px}
.card-desc{font-size:13px;color:var(--text-sub);line-height:1.6}
.form{margin-top:28px}
.field{margin-bottom:18px}
.field-label{display:block;font-size:11px;font-weight:500;color:var(--text-sub);letter-spacing:.06em;text-transform:uppercase;margin-bottom:8px}
.field-input{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:12px 14px;font-size:14px;color:var(--text);outline:none}
.field-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(59,122,237,.15)}
.field-input.error{border-color:var(--error)}
.field-input-wrap{position:relative}
.toggle-pw{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;color:var(--text-sub);font-size:12px}
.btn-login{width:100%;background:linear-gradient(135deg,var(--accent),#2d5fc7);border:none;border-radius:10px;padding:13px;font-size:15px;font-weight:700;color:#fff;cursor:pointer;margin-top:8px}
.alert{display:none;background:rgba(220,53,69,.08);border:1px solid rgba(220,53,69,.25);border-radius:10px;padding:12px 14px;font-size:13px;color:var(--error);margin-bottom:16px;line-height:1.5}
.alert.show{display:block}
.lock-msg{display:none;background:rgba(180,83,9,.08);border:1px solid rgba(180,83,9,.22);color:var(--warning);padding:12px;border-radius:10px;margin-bottom:16px;font-size:13px}
.lock-msg.show{display:block}