:root {
    --bg: #0a0a0a;
    --bg-card: #111;
    --bg-card2: #161616;
    --border: #333;
    --border-hover: #444;
    --text: #e8e8e8;
    --text-muted: #b0b0be;
    --text-dim: #9a9aaa;
    --accent: #d4a84a;
    --accent-dim: rgba(212, 168, 74, 0.12);
    --danger: #ff4d4f;
    --success: #22c55e;
    --radius: 10px;
    --radius-sm: 6px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', 'Noto Sans JP', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
.navbar { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; background: rgba(10,10,10,0.95); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.nav-brand { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 16px; letter-spacing: 1px; color: var(--accent); text-decoration: none; }
.nav-back { font-size: 13px; color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.nav-back:hover { color: var(--accent); }
.auth-container { max-width: 440px; margin: 60px auto; padding: 0 20px 60px; }
.auth-title { font-size: 24px; font-weight: 800; text-align: center; margin-bottom: 8px; }
.auth-subtitle { font-size: 13px; color: var(--text-muted); text-align: center; margin-bottom: 32px; }
.auth-btn { display: flex; align-items: center; justify-content: center; gap: 10px; width: 100%; padding: 14px 16px; border-radius: var(--radius); font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.2s; border: 1px solid var(--border); background: var(--bg-card); color: var(--text); margin-bottom: 12px; }
.auth-btn:hover { border-color: var(--border-hover); background: var(--bg-card2); }
.auth-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.auth-btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.divider { display: flex; align-items: center; gap: 12px; margin: 20px 0; font-size: 12px; color: var(--text-dim); }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.form-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 16px; }
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 12px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-label .req { color: var(--danger); margin-left: 4px; }
.form-input { width: 100%; padding: 12px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: 14px; font-family: inherit; transition: border-color 0.2s; }
.form-input:focus { outline: none; border-color: var(--accent); }
.form-input:-webkit-autofill,
.form-input:-webkit-autofill:hover, 
.form-input:-webkit-autofill:focus, 
.form-input:-webkit-autofill:active{
    -webkit-box-shadow: 0 0 0 30px var(--bg) inset !important;
    -webkit-text-fill-color: var(--text) !important;
}
.btn-primary { width: 100%; padding: 14px; font-size: 15px; font-weight: 700; border: none; background: var(--accent); color: #000; border-radius: var(--radius); cursor: pointer; transition: all 0.2s; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.forgot-link { display: block; text-align: right; font-size: 12px; color: var(--text-dim); margin-top: -8px; margin-bottom: 16px; cursor: pointer; text-decoration: none; }
.forgot-link:hover { color: var(--accent); }
.msg { margin-top: 12px; font-size: 13px; text-align: center; min-height: 20px; }
.msg.error { color: var(--danger); }
.msg.success { color: var(--success); }
.login-switch { text-align: center; margin-top: 20px; font-size: 13px; color: var(--text-muted); }
.login-switch a { color: var(--accent); text-decoration: none; font-weight: 600; }
.login-switch a:hover { text-decoration: underline; }
.spinner { width: 18px; height: 18px; border: 2px solid transparent; border-top-color: #000; border-radius: 50%; animation: spin 0.6s linear infinite; display: inline-block; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 480px) { .auth-container { padding: 0 16px 40px; margin-top: 32px; } }