* { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 
            background: #000; 
            color: #fff; 
            min-height: 100vh; 
            display: flex; 
            align-items: center; 
            justify-content: center;
            padding: 20px;
        }
        
        .login-container {
            width: 100%;
            max-width: 400px;
        }
        
        .login-box {
            background: #111;
            border: 1px solid #333;
            border-radius: 16px;
            padding: 40px 30px;
        }
        
        .logo {
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .logo a { text-decoration: none; }
        .logo span:first-child { color: #ff6b00; }
        .logo span:last-child { color: #fff; }
        
        .subtitle {
            text-align: center;
            color: #666;
            font-size: 14px;
            margin-bottom: 30px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            font-size: 13px;
            color: #888;
            margin-bottom: 8px;
        }
        
        .form-group input {
            width: 100%;
            background: #1a1a1a;
            border: 1px solid #333;
            border-radius: 8px;
            padding: 14px;
            color: #fff;
            font-size: 16px;
        }
        
        .form-group input:focus {
            outline: none;
            border-color: #ff6b00;
        }
        .form-group input:focus-visible {
            outline: 2px solid #ff6b00;
            outline-offset: 2px;
        }
        
        .error {
            background: #3d1a1a;
            border: 1px solid #ff4444;
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 20px;
            font-size: 13px;
            color: #ff6b6b;
            text-align: center;
        }
        
        .login-btn {
            width: 100%;
            background: #ff6b00;
            border: none;
            border-radius: 8px;
            padding: 14px;
            color: #000;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            margin-bottom: 15px;
        }
        
        .login-btn:hover {
            background: #ff8533;
        }
        
        .links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 20px;
            font-size: 13px;
        }
        
        .links a {
            color: #888;
            text-decoration: none;
        }
        
        .links a:hover {
            color: #ff6b00;
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 20px 0;
            color: #444;
            font-size: 12px;
        }
        
        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: #333;
        }
        
        .divider span {
            padding: 0 15px;
        }
        
        .register-link {
            display: block;
            text-align: center;
            color: #ff6b00;
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
        }
        
        .register-link:hover {
            color: #ff8533;
        }
        
        .back-link {
            text-align: center;
            margin-top: 20px;
        }
        
        .back-link a {
            color: #666;
            font-size: 13px;
            text-decoration: none;
        }
        
        .back-link a:hover {
            color: #ff6b00;
        }
        
        /* SNS Login Buttons */
        .sns-login-section {
            margin-top: 5px;
        }
        
        .sns-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 10px;
        }
        
        .sns-btn {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 14px 8px;
            border-radius: 10px;
            border: 1px solid #333;
            background: #1a1a1a;
            text-decoration: none;
            transition: all 0.2s;
        }
        
        .sns-btn:hover {
            border-color: #555;
            transform: translateY(-2px);
        }
        
        .sns-btn .sns-icon {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
        }
        
        .sns-btn .sns-name {
            font-size: 10px;
            color: #888;
            font-weight: 500;
        }
        
        .sns-btn.disabled {
            opacity: 0.3;
            pointer-events: none;
        }
        
        /* Provider colors */
        .sns-google .sns-icon { background: #4285f4; color: #fff; }
        .sns-line .sns-icon { background: #06c755; color: #fff; }
        .sns-facebook .sns-icon { background: #1877f2; color: #fff; }
        .sns-kakao .sns-icon { background: #fee500; color: #000; }
        .sns-tiktok .sns-icon { background: #000; color: #fff; border: 1px solid #333; }
        .sns-instagram .sns-icon { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); color: #fff; }
        
        /* ★ Remember Me */
        .remember-me {
            margin-bottom: 20px;
        }
        
        .remember-me label {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            font-size: 13px;
            color: #888;
        }
        
        .remember-me input[type="checkbox"] {
            width: 16px;
            height: 16px;
            accent-color: #ff6b00;
            cursor: pointer;
            flex-shrink: 0;
        }
        
        .remember-me span {
            user-select: none;
        }